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3M MACURCO GD-6 User Instructions

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Type: User Instructions
Category: Security Sensors
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3

Macurco

™ 

Combustible Gas Detector, Controller and Transducer 
User Instructions 

IMporTanT: Keep these User Instructions for reference.

GD-6


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1

TaBLE oF ConTEnTS

GEnEraL SaFETY InForMaTIon ................................................................................................................2

 

Intended Use ..........................................................................................................................................2

 

List of Warnings and Cautions ................................................................................................................2

USE InSTrUCTIonS anD LIMITaTIonS .......................................................................................................3

 

Use For ...................................................................................................................................................3

 

Do Not Use For .......................................................................................................................................3

 

General Description ................................................................................................................................3

 Features .................................................................................................................................................4

 Specifications .........................................................................................................................................4

InSTaLLaTIon anD opEraTInG InSTrUCTIonS ........................................................................................5

 

General Information ................................................................................................................................5

 Location .................................................................................................................................................5

 Installation .............................................................................................................................................6

 

 

Garage diagram ................................................................................................................................6

 

 

4-20mA Output diagram ...................................................................................................................7

 

 

Multiple Device diagram ...................................................................................................................8

 

 

Alarm Control Panel diagram ............................................................................................................9

 

 

DVP-120 Control Panel diagram ......................................................................................................10

 

Power Up .............................................................................................................................................11

 Operation .............................................................................................................................................11

 

Default – Factory Settings ....................................................................................................................11

 

 

Gas Selection .................................................................................................................................12

 

 

Display setting ................................................................................................................................13

 

 

Buzzer setting.................................................................................................................................13

 

 

Alarm Relay setting.........................................................................................................................13

 

 

Alarm Relay Configuration ..............................................................................................................13

 

 

Fan Relay setting ............................................................................................................................13

 

 

Fan Relay Delay setting ..................................................................................................................13

 

 

Fan Minimum Runtime setting ........................................................................................................14

 

 

4-20mA Output setting ...................................................................................................................14

 

On Board Diagnostics ...........................................................................................................................14

 

Sensor Poisons .....................................................................................................................................14

MaInTEnanCE ..........................................................................................................................................15

 Cleaning ...............................................................................................................................................15

 Testing .................................................................................................................................................15

 

 

Operation Test ................................................................................................................................16

 

 

Manual Operation Test ....................................................................................................................16

 

 

Combustible Gas Test .....................................................................................................................17

  Quick Gas Test ................................................................................................................................20

 

Field Calibration Procedure ...................................................................................................................21

 

 

Zero the Sensor ..............................................................................................................................21

   Calibration ......................................................................................................................................21

3M GaS DETECTIon proDUCTS WarranTY............................................................................................22

For MorE InForMaTIon .........................................................................................................................22


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GEnEraL SaFETY InForMaTIon
Intended Use

The 3M™ Macurco™ GD-6 Combustible Gas Detector, Controller and Transducer is a low voltage device with selectable 4-20mA 

output, buzzer and digital display options. It is an electronic detection system used to measure the concentration of combustible 

gas and provide feedback and automatic exhaust fan control to help reduce combustible gas concentrations in parking garages, 

maintenance facilities or other light commercial applications. The 3M™ Macurco™ GD-6 Combustible Gas Detector is a low level 

meter capable of displaying from 0-50% LEL (Lower Explosive Limit) of combustible gas. The 3M™ Macurco™ GD-6 Combustible 

Gas Detector is factory calibrated and tested for proper operation, but can also be calibrated in the field.
List of Warnings and Cautions within these User Instructions

USE InSTrUCTIonS anD LIMITaTIonS 

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•Eachpersonusingthisequipmentmustreadandunderstandtheinformationinthese User Instructions before use. Use 

ofthisequipmentbyuntrainedorunqualifiedpersons,orusethatisnotinaccordancewiththeseUser Instructions, may 

adversely affect product performance and 

result in sickness or death.

•Useonlyformonitoringthegaswhichthesensorandinstrumentaredesignedtomonitor.Failuretodosomayresultin

exposures to gases not detectable and 

cause sickness or death. For proper use, see supervisor or User Instructions, or 

call 3M in U.S.A., 1-800-243-4630. In Canada, call Technical Service at 1-800-267-4414.

•GD-6maynotfunctioneffectivelybelow0°Forabove125°F(-18°Corabove52°C).Usingthedetectoroutsideofthis

temperature range may adversely affect product performance and 

result in sickness or death.

•Thisdetectorhelpsmonitorforthepresenceandconcentrationlevelofcertainspecifiedairbornegases.Misusemay

produce an inaccurate reading, which means that higher levels of the gas being monitored may be present and could 

result in overexposure and 

cause sickness or death. For proper use, see supervisor or User Instructions, or call 3M in 

U.S.A., 1-800-243-4630. In Canada, call Technical Service at 1-800-267-4414.

•Eachtimetheunitisturnedonitperformsaself-test,whichactivatesvisualalarms.Iftheself-testfails,orifallthealarmsdo

not activate, do not use. Failure to do so may adversely affect product performance and 

result in sickness or death.

•Donotcoverorobstructvisualalarm.Doingsomayadverselyaffectproductperformanceand

result in sickness or death.

•Donotdisassembleunitorattempttorepairormodifyanycomponentofthisinstrument.Thisinstrumentcontainsnouser

serviceable parts, and substitution of components may impair product performance and 

result in sickness or death.

•Usingacertifiedgaswithaconcentrationotherthantheonelistedforthisinstrumentandsensorwhenconductinga

calibration or calibration verification test (bump test) will produce inaccurate readings. This means that higher levels of the 

gas being monitored may be present and could result in overexposure and 

cause sickness or death. For proper use, see 

supervisor, User Instructions or call 3M in U.S.A., 1-800-243-4630. In Canada, call Technical Service at 1-800-267-4414.

•Thefollowingstepsmustbeperformedwhenconductingacalibrationorcalibrationverificationtest(bumptest)toensureproper

performance of the monitor. Failure to do so may adversely affect product performance and 

result in sickness or death.

• Whenperformingacalibrationorcalibrationverificationtest(bumptest)onlyusecertifiedcalibrationgasatthe

requiredconcentrationlevel.Donotcalibratewithexpiredcalibrationgas.

 • Iftheinstrumentcannotbecalibrated,donotuseuntilthereasoncanbedeterminedandcorrected.
 • Donotcoverorobstructdisplayorvisualalarmcover.
 • Ensuresensorinletisunobstructedandisfreeofdebris.

EachpersonusingthisequipmentmustreadandunderstandtheinformationintheseUser Instructions before use. Use 

ofthisequipmentbyuntrainedorunqualifiedpersons,orusethatisnotinaccordancewiththeseUser Instructions, may 

adversely affect product performance and 

result in sickness or death.

Use For

The 3M™ Macurco™ GD-6 Combustible Gas Detector helps combustible gas detection and automatic exhaust fan control 

for automotive maintenance facilities, enclosed parking garages, warehouses with forklifts, etc. The 3M™ Macurco™ GD-6 

Combustible Gas Detector can be used with 12VDC or 24VDC N.O. (fire/security) panels.

Use only for monitoring the gas which the sensor and instrument are designed to monitor. Failure to do so may result in 

exposures to gases not detectable and 

cause sickness or death. For proper use, see supervisor or User Instructions, or 

call 3M in U.S.A., 1-800-243-4630. In Canada, call Technical Service at 1-800-267-4414.

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Do not Use For
The 3M™ Macurco™ GD-6 Combustible Gas Detector is 

noT intended for use in hazardous locations or industrial applications 

such as refineries, chemical plants, etc.  

Do noTmountthe3M™Macurco™GD-6CombustibleGasDetectorwherethenormalambienttemperatureisbelow0°For

exceeds125°F(-18°Corabove52°C).The3M™Macurco™GD-6CombustibleGasDetectormountsonatype4Selectrical

box supplied by the contractor. 

The3M™Macurco™GD-6CombustibleGasDetectormaynotfunctioneffectivelybelow0°Forabove125°F(-18°Cor

above52°C).Usingthedetectoroutsideofthistemperaturerangemayadverselyaffectproductperformanceand

 result in 

sickness or death.

General Description 
The 3M™ Macurco™ GD-6 Combustible Gas Detector is a low voltage, dual relay combustible gas (EX) detector and automatic 

ventilation controller. The 3M™ Macurco™ GD-6 Combustible Gas Detector uses a microcomputer controlled, electronic 

system to measure the concentration of combustible gas, actuate relays and provide a 4-20mA (0-50% LEL) output. The  

3M™ Macurco™ GD-6 Combustible Gas Detector is low maintenance with a long life (5+ years) pellistor sensor and optional 

gas test and calibration kits. The 3M™ Macurco™ GD-6 Combustible Gas Detector is a low level meter capable of displaying 

from 0-50% LEL of combustible gas.


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Ifyouhaveanydoubtsabouttheapplicabilityoftheequipmenttoyourjobsituation,consultanIndustrialHygienistorcall3M

Macurco Technical Service at 1-800-243-4630. In Canada, call 1-800-267-4414.
General Information

The 3M™ Macurco™ GD-6 Combustible Gas Detector helps combustible gas detection and automatic exhaust fan control for 

automotive maintenance facilities, enclosed parking garages, warehouses with forklifts, etc. The GD-6 can be used with 12VDC 

or 24VDC N.O. (fire/security) panels.
Location

A 3M™ Macurco™ GD-6 Combustible Gas Detector is usually located in areas where there is potential for gas leaks; where 

there are gas appliances, areas through which gas pipes pass, where batteries are being stored or charged, etc. 

Do noT mount 

the 3M™ Macurco™ GD-6 Combustible Gas Detector in a corner. 

Do noT mount the 3M™ Macurco™ GD-6 Combustible Gas 

Detectorwherethenormalambienttemperatureisbelowbelow0°Forexceeds125°F(-18°Corabove52°C).Ifthetargetgas

islighterthanair;naturalgas(Methane)orHydrogen(H

2

), mount the 3M™ Macurco™ GD-6 Combustible Gas Detector high 

on a wall about one foot down from the ceiling. If the target gas is heavier than air; propane (LP), mount the 3M™ Macurco™ 

GD-6 Combustible Gas Detector on a wall or column one foot above the floor. Use the same spacing as for smoke detectors-30 

footcenters,900squarefeetperdetector.
note: alcohols, ammonia, cleaning solvents, paint thinner; gasoline vapors and aerosol propellants (aerosol cans such as hair 

spray usually contain a combustible gas) may cause alarms.

Features

• ETLListedtoUL61010-1
• The3M™Macurco™GD-6CombustibleGasDetectorcanbebump-testedwiththeFTKwith10%LELMethane, 

10%LELPropaneor10%LELHydrogengas,regulatorandcalibrationhood.

• The3M™Macurco™GD-6CombustibleGasDetectorcanbefieldcalibratedusing10%LELMethane,10%LEL

Propaneor10%LELHydrogengas,regulatorandcalibrationhood.

• The3M™Macurco™GD-6CombustibleGasDetectorisalowlevelmetercapableofdisplayingfrom0-50%LELEX
• Selectablefanandalarmrelayactivation
• 5ASPDTfanrelaycontrolsstartersofexhaustfans
• 0.5AN.O.orN.C.alarmrelayconnectstowarningdevicesorcontrolpanels
• 4-20mAcurrentloop
• The3M™Macurco™GD-6CombustibleGasDetectormountsonastandard4x4electricalboxandbecomescover 

for the box

• Supervisedsystem:anyinternaldetectorproblemwillcausethefan&alarmrelaytoactivate
• Optionalcalibrationkitisavailable.Onescrewallowsaccessforcalibration

Specifications

• Power:3W(max)from12to24VAC(VoltsAlternatingCurrent)or12to48VDC(VoltsDirectCurrent)
• Current@24VDC:75mAinalarm(tworelays),50mA(fanrelayonly)and23mAstandby
• ShippingWeight:1pound(0.45kg)
• Size:41/2x4x21/8in.(11.4x10.2x5.4cm)
• Color:darkgray
• Connections:plugs/terminals
• Mountingbox:(notincluded)4x4electric
• Fanrelay:5A,240VAC,pilotduty,SPDT
• Fanrelayactuation:selectableat1,2,3,4,5,6,7,8,9,10(default),11,12,13,14,15,16,17,18,19,20%LEL
• FanDelaySettingsof0,1,3(default),5and10minutes
• FanMinimumRunTimesettingsareOFF(default),3,5,10or15minutes
• Alarmrelay:0.5A200V,10VA
• Alarmrelayactuation:selectableN.O.defaultorN.C.
• Alarmrelaysettings:OFF,5,10,15,20(default),25%LEL
• Currentloop,4-20mAfor0-50%LEL
• Operatingenviron:0°Fto125°F(-18°Cto52°C).10to90%RH

InSTaLLaTIon anD opEraTInG InSTrUCTIonS

The following instructions are intended to serve as a guideline for the use of the 3M™ Macurco™ GD-6 Combustible 

Gas Detector, Controller and Transducer. It is not to be considered all-inclusive, nor is it intended to replace the policy and 

procedures for each facility. 

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This detector monitors for the presence and concentration level of certain specified airborne gases. Misuse may produce 

an inaccurate reading, which means that higher levels of the gas being monitored may be present and could result in 

overexposure and 

cause sickness or death. For proper use, see supervisor, User Instructions or call 3M in U.S.A.,  

1-800-243-4630. In Canada, call Technical Service at 1-800-267-4414.


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Installation
1.  The 3M™ Macurco™ GD-6 Combustible Gas Detector mounts on a type 4S electrical box supplied by the contractor. 
2.  Connect the 3M™ Macurco™ GD-6 Combustible Gas Detector to Class 2 power supply only. It is suggested to use a 

separate transformer for powering the unit or units because of possible interference’s from other devices on the same 

power supply. 

3.  Connect the 3M™ Macurco™ GD-6 Combustible Gas Detector to the control cables with terminal plugs. When making 

connections, make sure the power is off. 

4. TherearetwoterminalsforPower:12to24VACor12to48VDC,withnopolaritypreference.
5.  There are two terminals for the dry alarm relay contacts, again with no polarity preference. The alarm relay can switch up 

to 0.5A, 200V, or 10VA. The alarm relay is activated if gas reaches or exceeds the alarm settings. 

6.  The alarm relay can be configured to normally open (default) (N.O.) or normally closed (N.C.) and will activate if the gas 

concentration exceeds alarm set point (5, 10, 15, 20 (default), 25% LEL). It will deactivate once the gas concentration drops 

below the alarm set point. Note that the “disable” setting will cause the alarm relay not to engage at all.

7.  The dry contact, SPDT fan relay has three terminals. The common (COM.), normally open (N.O.) and the normally closed 

(N.C.) contact. The fan relay can switch up to 5.0A up to 240VAC. (see OPERATION section of these User Instructions for 

details on relay settings).

8.  The fan relay can be wired to normally open (N.O.) or normally closed (N.C.) and will engage if the fan setting (1, 2, 3, 

4, 5, 6, 7, 8, 9, 10 (default), 11, 12, 13, 14, 15, 16, 17, 18, 19, 20% LEL) is exceeded for the fan relay delay time (0, 1, 

3(default),5,10minutes).Thefanrelaywilldisengageoncebothoftheseconditionshavebeenmet:1.Combustible

gas concentration has dropped below fan setting and 2. Fan relay run time (0 (default), 3, 5, 10, 15 minutes) has been 

exceeded. Note that the “disable” fan setting will cause the fan relay to not engage. The fan relay will engage in trouble 

fault condition and will disengage once trouble fault condition is cleared.

9.  The Current Loop is 4mA in clean air and 4-20mA for 0-50% LEL.

Percent % LEL

0

12.5

25

37.5

50

4

Output in mA: GD-6

9

14

20

GD-6 rear view with

Modular Connectors


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Typical Multiple 3M™ Macurco™ GD-6 
Combustible Gas Detector Installation

INSTALLATION NOTES
1.  One sensor per 900 square feet (approximately).
2.  If the gas used is natural gas (methane) or Hydrogen (H2) mount the 3M™ 

Macurco™ GD-6 Combustible Gas Detector high on a wall about one foot down 
from the ceiling. If the gas used is propane (LP), mount the 3M™ Macurco™ GD-6 
Combustible Gas Detector on a wall or column one foot above the floor.

3.  See applicable building code for fan size vs air changes per periods of time.
4.  Make sure there are air inlets to provide adequate air flow throughout the building.
5.  3M™ Macurco™ GD-6 Combustible Gas Detector fan relays are dry contact & can 

switch up to 240V.

6.  Several fan relays (starters) may be used. Match the relays to the fan size.

Typical Connection to Alarm Control Panel

1.   3M™ Macurco™ GD-6 Combustible Gas Detector can be used with 12VDC or 24VDC N.O. 

(fire) panels.

2.   Alarm panel provides battery backed up power to 3M™ Macurco™ GD-6 Combustible Gas 

Detector.

3.   3M™ Macurco™ GD-6 Combustible Gas Detector dry contact fan relay can use panel power 

or fan power. Check ratings on panel & fan.

4.   Match fan relay contacts to fan size, and coil voltage to power source.
5.   Alarm Control Panels are available with many features & can control other devices such as 

smoke detectors, fire detectors & burglar alarms.


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GD-6

Main Fan Power

120VAC 

ALARM

120VAC 

Power

Exhaust Fans

coil

coil

power

output

GD-6

+

power

output

+

8

7

6

5

4

4

3

3

2

2

1

1

1

1

3

3

4

5

6

7

8

9

2

24 V 

RET

N.C.

N.C.

N.C.

N.O.

N.O.

N.O.

COM

COM

COM

-1 LOOP

+1 LOOP

+24 VDC

-1 LOOP

+1 LOOP

+24 VDC

- Strobe 

+ Strobe 

- Horn 

+ Horn 

Relay 1

Gnd

Panel Power 

120/250VAC

3M™ MACURCO™ 

 DETECTION AND VENTILATION 

CONTROL PANEL DVP-120

STARTER RELAYS 

120VAC COILS

Relay 2

Relay 3

24 V 

RET

L

N

Typical Connection to the 3M™ Macurco™ Detection and Ventilation 
Control Panel DVP-120

Gas detection and exhaust fan control is provided by a 3M™ Macurco™ DVP-120 system. This System 
will use the GD-6 Combustible Gas  to current transducer, Nitrogen Dioxide to current transducers or 
Carbon Monoxide to current transducers. Each transducer will measure the level of the target gas and 
provide this information to the DVP-120 over a 4-to-20mA current loop.
All power and signal connections for the transducers are provided from the DVP-120 control panel, via 
unshielded four conductor cable. The DVP-120 control panel provides three relays which can be used for 
ventilation fan control or alarm signaling. These relays (SPDT-Form C) are for pilot duty only, capable of 
switching 10 amps loads up to 240VAC.
NOTE:
1. Power connections at the sensor are non-polarized.

 

power Up

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Each time the unit is turned on it performs a self-test, which activates visual alarms. If the self-test fails, or if all the alarms 

do not activate, do not use. Failure to do so may adversely affect product performance and 

result in sickness or death.

The 3M™ Macurco™ GD-6 Combustible Gas Detector cycles through an internal self-test cycle for the first minute that it is 

powered. The unit will execute the test cycle any time power is dropped and reapplied (i.e. power failure). During the self-test 

cycle the unit will display the firmware version number, then count down from 60 to 0 and finally go into normal operation. The 

fan and alarm relay will be activated for the power-up cycle unless the “Power Up Test” (PUt) option is OFF. The indicator light 

(LED) will flash green during the self-test cycle. At the end of the 1 minute cycle, the unit will take its first sample of the air and 

the light will turn solid green. 

Do not cover or obstruct visual alarm LED. Doing so may adversely affect product performance and 

result in sickness  

or death.

operation

1.  With the display function turned “On”, the 3M™ Macurco™ GD-6 Combustible Gas Detector will show the current 

concentration of gas % LEL or “0” (zero) in clean air. When the gas concentration reaches the Fan Relay setting (10% LEL, 

for example) the display will flash back and forth between “FAn” and “10”. With the display function turned ”Off”, the 

display does not show the gas concentration, but will show “FAn” as long as the fan relay is activated.

2.  With the display function turned “On” and the gas concentration reaching the alarm relay setting, (20% LEL, for example) 

the display will flash back and forth between “ALr” and “20”. The buzzer will sound indicating “Alarm” if the buzzer is 

turned “On”. With the display function turned off the display does not show the gas concentration, but will show “ALr” 

when the Alarm relay is activated.

3.  With the 4-20mA function turned “On”, the 4-20mA output will correspond to the concentration (0-50% LEL). The display 

will show “FAn” and “ALr” and sound as outlined above.

Default Configuration – Factory Settings

• Thedefault

Display setting is off

• Thedefault

power Up Test setting is on

• Thedefault

Buzzer setting is off

• Thedefault

alarm relay setting is activation at 20% LEL

• Thedefault

Fan relay Delay setting is 3 minutes

• Thedefault

Fan Minimum runtime setting is oFF

• Thedefault

Fan relay setting is activation at 10% LEL

• Thedefault

alarm relay Configuration is normally open

• Thedefault

4-20ma output setting is oFF


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To change settings, remove the Philips screw on the front of the 3M™ Macurco™ GD-6 Combustible Gas Detector. Pull off the 

front cover of the unit.

Gas Selection

To select the 

Gas option, in normal mode, press the Next button once to display the current gas selection (mE is Methane, 

pro is propane and Hy is Hydrogen). Then press the Enter button twice to enter the selection menu. The currently selected 

gas will be shown on the display. Press 

Next to scroll through the available gases selections. The selected gas will be flashing, 

press 

Enter to select the gas and Enter again to confirm the selection. To return back to normal mode press Next until “End” is 

displayed and press 

Enter.

Selecting Default Configuration – “dEF”

To select the Default Configuration, in normal mode, press the 

Next button twice to get to “Con” or the Configuration menu. 

Then press the 

Enter button to enter the Con menu. The first selection is the “dEF” or Default setting. Press Enter. If it is 

already in Default configuration, there will be no action. If it is not already in Default configuration, “nO” will be displayed. Press 

Next to change it to “YES” (flashing) then press Enter to confirm the change (solid) and press Enter again to return to “dEF” in 

the Con menu. Press 

Next until “End” is displayed then press Enter to return to normal operation. 

Selecting power Up Test option – “pUt”

To select the 

power Up Test Configuration, in normal mode, press the Next button twice to get to “Con” or the Configuration 

menu. Then press the 

Enter button to enter the Con menu. Then press the Next button to get to the second selection “PUt” 

or 

power Up Test setting. Press Enter. If the test is “On” press Next to turn it “OFF” (flashing) then press Enter to confirm the 

change (solid) and press 

Enter again to return to “PUt” in the Con menu. Press Next until “End” is displayed then press Enter 

to return to normal operation. 

Selecting Display option – “dSp”

To select the Display Configuration, in normal mode, press the 

Next button twice to get to “Con” or the Configuration menu. 

Then press the 

Enter button to enter the Con menu. Then press the Next button twice to get to the third selection “dSP” or 

Display setting. Press 

Enter. If the display is “On” press Next to turn it “OFF” (flashing) then press Enter to confirm the change 

(solid) and press 

Enter again to return to “dSP” in the Con menu. Press Next until “End” is displayed then press Enter to return 

to normal operation. 
Selecting Buzzer option – “bUZ”

To select the Buzzer Configuration, in normal mode, press the 

Next button twice to get to “Con” or the Configuration menu. 

Then press the 

Enter button to enter the Con menu. The fourth selection is the “bUZ” or Buzzer setting. Press Next three 

times to get to “bUZ” then press 

Enter. If the display is “On” press Next to turn it “OFF” (flashing) then press Enter to confirm 

the change (solid) and press 

Enter again to return to “bUZ” in the Con menu. Press Next until “End” is displayed then press 

Enter to return to normal operation. 
Selecting alarm relay Setting – “arS”

To select the Alarm Relay Setting, in normal mode, press the 

Next button twice to get to “Con” or the Configuration menu. Then 

press the 

Enter button to enter the Con menu. The fifth selection is the “ArS” or Alarm Relay Setting. Press Next four times to 

get to “ArS” then press 

Enter. If the display is “OFF” (disabled) press Next to change it to 5, 10, 15, 20 or 25% LEL (flashing) 

then press 

Enter to confirm the change (solid) and press Enter again to return to “ArS” in the Con menu. Press Next until “End” 

is displayed then press 

Enter to return to normal operation. 

Selecting alarm relay Configuration – “arc”

To select the 

alarm relay Configuration, in normal mode, press the Next button twice to get to “Con” or the Configuration 

menu. Then press the 

Enter button to enter the Con menu. The sixth selection is the “Arc” or Alarm Relay Configuration. Press 

Next five times to get to “Arc” then press Enter. If the relay is “nO” (normally open) press Next to turn it to “nC” (flashing) then 

press 

Enter to confirm the change (solid) and press Enter again to return to “Arc” in the Con menu. Press Next until “End” is 

displayed then press 

Enter to return to normal operation. 

Selecting Fan relay Settings – “FrS”

To select the Fan Relay setting, in normal mode, press the 

Next button twice to get to “Con” or the Configuration menu. Then 

press the 

Enter button to enter the Con menu. The seventh selection is the “FrS” or Fan Relay setting. Press Next six times 

to get to “FrS” then press 

Enter. If the fan relay is “OFF” (disabled) press Next to change it to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 

13, 14, 15, 16, 17, 18, 19 or 20% LEL (flashing) then press 

Enter to confirm the change (solid) and press Enter again to return 

to “run” in the Con menu. Press 

Next until “End” is displayed then press Enter to return to normal operation. 

Selecting Fan relay Delay – “FrD”

To select the Fan Relay Delay setting, in normal mode, press the 

Next button twice to get to “Con” or the Configuration 

menu. Then press the 

Enter button to enter the Con menu. The eighth selection is the “FrD” or Fan Relay Delay. Press Next 

seven times to get to “FrD” then press 

Enter. If the delay is “OFF” (disabled) press Next to change it to 1, 3, 5, or 10 minutes 

(flashing) then press 

Enter to confirm the change (solid) and press Enter again to return to “FrD” in the Con menu. Press Next 

until “End” is displayed then press 

Enter to return to normal operation. 


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Selecting Fan Minimum run Time – “Frr”

To select the Fan Minimum Runtime setting, in normal mode, press the 

Next button twice to get to “Con” or the Configuration 

menu. Then press the 

Enter button to enter the Con menu. The ninth selection is the “Frr” or Fan Minimum Run Time. Press 

Next eight times to get to “Frr” then press Enter. If the runtime is “OFF” (disabled) press Next to change it to 3, 5, 10 or 15 

minutes (flashing) then press 

Enter to confirm the change (solid) and press Enter again to return to “run” in the Con menu. 

Press 

Next until “End” is displayed then press Enter to return to normal operation.

Selecting 4-20ma output option – “420”

To select the 

4-20ma output option, in normal mode, press the Next button twice to get to “Con” or the Configuration menu. 

Then press the 

Enter button to enter the Con menu. The tenth selection is the “420” or 4-20mA Output Option. Press Next 

nine times to get to “420” then press 

Enter. If the 4-20mA is “On” press Next to turn it to “OFF” (flashing) then press Enter to 

confirm the change (solid) and press 

Enter again to return to “420” in the Con menu. Press Next until “End” is displayed then 

press 

Enter to return to normal operation. 

onboard Diagnostics

The 3M™ Macurco™ GD-6 Combustible Gas Detector monitors all critical functions of the unit through software diagnostics 

that continuously test and verify unit operations. If a problem is found, the unit will switch to a fail-safe/error mode or trouble 

condition. In this error mode, the Fan and Alarm relays will be activated; the 4-20mA current loop will go to 24mA and the LED 

light will Flash Green. This is a safety precaution. To clear this mode, simply turn off power to the unit for a few seconds, or 

press the TEST switch (inside the unit). This will cause the unit to restart the 1 minute self-test cycle. 
The4-20mAsignalcanbeusedfortroubleshooting:

• 0mAismostlikelyaconnectionproblem
• 4-20mAisnormalgasreadingrange(0-50%LEL)
• 24mAindicatesaTroublecondition

Error Codes

• t01

Sensorismissing

• t02

Temperaturecompensationfailed

• t04

BadEEPROMchecksum

• t08

Sensorisshorted

• t10

BadEEPROM

• t20

Badfactorycalibration

• t40

Factorycalibrationwasnotdone

• t80

SDADCreadingfailed

Iftheerrormoderepeatsfrequently,checkforcontinuouspowerandpropervoltage.Ifpowerisnottheproblemandaunithas

repeating error conditions, it may need to be returned to 3M Macurco for service, as noted in these User Instructions.
Sensor poisons

The gas sensor in the detector is designed with extreme sensitivity to the environment. As a result, the sensing function may be 

deteriorated if it is exposed to a direct spray from aerosols such as paints, silicone vapors, etc., or to a high density of corrosive 

gases (such as hydrogen sulfide, sulfur dioxide) for an extended period of time.

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Do not disassemble unit or attempt to repair or modify any component of this instrument. This instrument contains no 

user serviceable parts, and substitution of components may impair intrinsic safety, which may adversely affect product 

performance and

 result in sickness or death.

CaUTIon

• Avoidtheuseofharshcleaningmaterials,abrasivesandotherorganicsolvents.Suchmaterialsmaypermanently

scratch the surfaces and damage the display window, labels, or instrument housing.

Cleaning

Cleaning of the external surfaces is best carried out using a damp cloth with a mild detergent or soap. Vacuum under the cover 

with soft brush to remove dust or contamination.
Testing

Using a certified gas with a concentration other than the one listed for this instrument and sensor when conducting a 

calibration or calibration verification test (bump test) will produce inaccurate readings. This means that higher levels of the 

gas being monitored may be present and could result in overexposure and

 cause sickness or death. For proper use, see 

supervisor or User Instructions, or call 3M in U.S.A., 1-800-243-4630. In Canada, call Technical Service at 1-800-267-4414.

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General
Therearemultiplewaystotestthe3M™Macurco™GD-6CombustibleGasDetectorafterinstallation:OperationTest,

Manual Operation Test, Combustible Gas Test and Quick Gas Test. The 3M™ Macurco™ GD-6 Combustible Gas Detector 

also has the ability to test itself automatically and does so every 2 1/2 minute cycle. If the unit detects an improper voltage or 

inoperablecomponentitwilldefaultintoErrormode.InErrormode,theunitwillFlashGreenandboththefan&alarmrelay

will be actuated. Check that the 3M™ Macurco™ GD-6 Combustible Gas Detector OPERATING LED type light is illuminated, 

continuously. If not, do not proceed with the tests. If the unit is in error mode contact your local representative or 3M Macurco 

Technical Service representative for information on resolving the problem.

MaInTEnanCE

The3M™Macurco™GD-6CombustibleGasDetectordoesnotrequireregularmaintenanceotherthancleaning.Theunituses

a long life pellistor sensor that has a 5+ year life expectancy. All maintenance and repair of products manufactured by 3M are 

to be performed at the appropriate 3M manufacturing facility. 3M does not sanction any third-party repair facilities.


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operation Test

1.  Remove the single screw in the middle of the front cover of the 3M™ Macurco™ GD-6 Combustible Gas Detector.
2.  Remove the front cover.
3.  Observe the LED light on the front of the 3M™ Macurco™ GD-6 Combustible Gas Detector.
4.  If the light is solid green proceed to step 6.
5.  If the light is off or flashing Green, refer to the General section of this User Instruction.
6.  Locate the switch labeled ENTER/TEST on the left side of the printed circuit board. Press the Test switch once.
7. The3M™Macurco™GD-6CombustibleGasDetectorwillstepthroughacycletest:

a.  The display progresses through the 

art (alarm relay test), Frt (fan relay test) then 42t (4-20mA output test).

b.  During the first 5 seconds of the test cycle, the alarm relay will be closed, so any devices connected to that relay will 

be tested.

c.  The Fan relay will be activated for the next 1 minute of the test, so if the fan circuits are wired in the normal manner, 

the fan should run.

d.  The 4-20mA output will then ramp up from 4 to 20mA over the next 130 seconds of the test, so if the circuit is wired 

in the normal manner, the control panel or building automation system should respond.

e. Attheendofthetestcycle,thelightwillturngreenandbeonsteady(NormalOperation),thefan&alarmrelaywillbe

in standby mode and the 4-20mA output will return to 4mA (in clean air).

8.  When testing is completed reassemble the unit or units.
Manual operation Test

This option gives the user the opportunity to manually initiate an individual test for each relay, the analog output and the sensor 

response to gas. From normal operation mode press the 

Next button 3 times to get to the Test Mode (tSt). Press the Enter 

button once to get into the Test Menu. Press the 

Next button to scroll through the four test options and press Enter to initiate 

the selected test. Note that if the relay or 4–20mA output has been disabled, the test selection will not be displayed in the test 

menu.
Art - Alarm Relay Test, 10 seconds 
Frt - Fan Relay Test, 60 seconds
42t - 420 loop test, 25 seconds
gtS - Gas Test, 3 minutes (no output to the panel during the gas test)
The display will flash during the test or in the case of the gas test the level will alternate with the expected gas (

mEpro or Hy). 

Once the test is complete, the display will return to steady display. To exit the test menu, press the 

Next button until “End” is 

displayed then press 

Enter to return to normal mode. 

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The following steps must be performed when conducting a calibration or calibration verification test (bump test) to ensure 

proper performance of the monitor. Failure to do so may adversely affect product performance and

 result in sickness or 

death.

• Whenperformingacalibrationorcalibrationverificationtest(bumptest)onlyusecertifiedcalibrationgasatthe

requiredconcentrationlevel.Donotcalibratewithexpiredcalibrationgas.

• Iftheinstrumentcannotbecalibrated,donotuseuntilthereasoncanbedeterminedandcorrected.
• Donotcoverorobstructdisplay,audiblealarmopeningorvisualalarmcover.
• Ensuresensorinletisunobstructedandisfreeofdebris.

Combustible Gas Test 

General

The 3M™ Macurco™ GD-6 Combustible Gas Detector can be bump-tested or calibrated with a Field Calibration Kit (FCK) with 

Methane,PropaneorHydrogengas,regulatorandtesthood,availablethroughyourlocalrepresentativeorfrom3MMacurco.
Contents of the FCK

• 3M™Macurco™MethaneGasFieldCalibrationKitGDM-FCK,34L,10%LEL,34L,20%LEL,CarryCase,Regulator,

Tubing,CalibrationHood

• 3M™Macurco™PropaneGasFieldCalibrationKitGDP-FCK,34L,10%LEL,34L,20%LEL,CarryCase,Regulator,Tubing,

CalibrationHood

• 3M™Macurco™HydrogenGasFieldCalibrationKitGDH-FCK,34L,10%LEL,34L,20%LEL,CarryCase,Regulator,

Tubing,CalibrationHood

FCK Information

Several detectors can be calibrated with one FCK. The only limitation is the amount of gas in the cylinder. The 17 liter cylinder 

with 0.2 LPM (Liters Per Minute) regulator has approximately 85 minutes of continuous calibration run time. Replacement 

cylinders are available. The gas cylinder should be replaced when the pressure gauge on the regulator shows 25psi or less.

note: For optimum test results it is suggested that the unit be in clean air (solid green light on) and be in a low 

ambient air flow.


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Gas Testing

Testing the Fan relay

note: The gas concentration to activate the fan relay depends on the setting.
1.  Remove the Philips screw on the front of the 3M™ Macurco™ GD-6 Combustible Gas Detector. Remove the front cover.
2.  Connect the 10% LEL cylinder of Combustible Gas to the regulator. Ensure that the gas used for calibration matches the 

gas selected in the 3M™ Macurco™ GD-6 Combustible Gas Detector configuration.

3.  Assemble regulator, hose and test hood and place the test hood over the gas sensor.
4.  Check the pressure gauge on the regulator. If you have 25psi or less you will need to replace the gas canister.
 

note: The time to activate the fan relay depends on the delay setting.

5.  Turn on the regulator to start the gas flow and wait with the gas applied continuously.
6.  With the display function turned “On”, the 3M™ Macurco™ GD-6 Combustible Gas Detector will show the current 

concentration of gas or “0” (zero) in clean air. When the gas concentration reaches the fan relay setting (5% LEL, for 

example) the display will flash back and forth between “FAn” and “5”. With the display function turned ”Off”, the display 

does not show the gas concentration, but will show “FAn” as long as the fan relay is activated
note: If the Fan relay does not close within 2 minutes, consider these possibilities:
a.  Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25psi or less.
b.  Unit needs to be re-calibrated (go through recalibration and re-test).
c.  Detector is in need of servicing (return unit to factory for servicing).
d.  Detector has fan relay set to disable (OFF) or 20% LEL. Set fan relay to 5% LEL and repeat the test. 

7.  Remove the gas from the sensor. Proceed to test the alarm relay or replace the top cover.
Testing the alarm relay

note: The gas concentration to activate the alarm relay depends on the setting.
Connect the 20% LEL cylinder of Combustible Gas to the regulator. Ensure that the gas used for calibration matches the gas 

selected in the 3M™ Macurco™ GD-6 Combustible Gas Detector configuration.
1.  Check the pressure gauge. If there is 25psi or less the cylinder should be replaced.
2.  Place the test hood over the gas sensor. Turn on the regulator to start the gas flow.
3.  The Fan relay should activate according to the settings.
4.  With the display function turned “On” and the gas concentration reaching the Alarm Relay setting, (20% LEL, for example) 

the display will flash back and forth between “ALr” and “20”. The buzzer will sound indicating “Alarm” if the buzzer is 

turned “On”. With the display function turned off the display does not show the gas concentration, but will show “ALr” 

when the Alarm relay is activated.

5. 

note: If the alarm relay fails to operate within 2 minutes, consider these possibilities:
a.  Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25psi or less.
b.  Unit needs to be re-calibrated (go through recalibration and re-test).
c.  Detector is in need of servicing (return unit to factory for servicing).
d.  Detector has Alarm relay set to disable (OFF). Set Alarm relay to 20% LEL and repeat the test. 

6.  Remove the gas from the sensor after test. Proceed to test the 4-20mA output or replace the top cover.
Testing the 4-20ma current loop

Connect the 20% LEL cylinder of Combustible Gas to the regulator. Ensure that the gas used for calibration matches the gas 

selected in the 3M™ Macurco™ GD-6 Combustible Gas Detector configuration.
1.  Check the pressure gauge. If there is 25psi or less the cylinder should be replaced.
2.  Place the test hood from the regulator over the gas sensor. Turn on the regulator to start the gas flow.
3.  The fan relay should activate according to the settings.
4.  The alarm relay should activate according to the settings.


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5.  The 4-20mA output should ramp up from 4mA in clean air to 20mA at 50% LEL. See 4-20mA diagram in these User 

Instructions.

note: If the 4-20ma output does not ramp up within 2 minutes, consider these possibilities:
a.  Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25psi or less.
b.  Unit needs to be re-calibrated (go through recalibration and re-test).
c.  Detector is in need of servicing (return unit to factory for servicing).
d.  Detector has 4-20mA option set to “OFF”. Set 4-20mA option to “On” and repeat the test. 

6.  Remove the gas from the sensor. Re-assemble the 3M™ Macurco™ GD-6 Combustible Gas Detector (make sure the LED 

is aligned with the hole on the front of the case).

Quick Gas Test

A cigarette lighter can be used to perform a functionality test of the 3M™ Macurco™ GD-6 Combustible Gas Detector. This 

testallowsinstallerstodoaquickfunctionalitytestofthegassensor.
1.  Units to be tested must be powered continuously for a minimum of 3 minutes before proceeding.
2.  For optimum test results, the unit should be in clean air and be in a low ambient air flow.
3.  Check that the 3M™ Macurco™ GD-6 Combustible Gas Detector status indicator light is illuminated green continuously. 

If not, do not proceed with tests. See 3M™ Macurco™ GD-6 Combustible Gas Detector Trouble Indicator section in these 

User Instructions.

4.  The display option should be set to “On” and reading 0% LEL in clean air. 
5.  Aim the lighter into the sensor grate area (under “DO NOT PAINT”) on the front cover and release the gas without igniting 

the flame for 2 to 3 seconds. 

6.  Wait for a few seconds. The digital display should climb indicating the increased gas concentration at the sensor 

confirmingapassofthequicktest.

note: If the Display does not change within 10 seconds, consider these possibilities:
a.  Lighter is empty.
b.  Unit needs to be re-calibrated (go through the Field Calibration Procedure in these User Instructions and re-test).
c.  Detector is in need of servicing (return unit to factory for servicing).

7.  Wait for the display to return to 0% LEL and configure options to desired settings.
Field Calibration procedure

note: For optimum calibration results the unit should be in clean air and be in a low ambient air flow.

Using a certified gas with a concentration other than the one listed for this instrument and sensor when conducting a 

calibration or calibration verification test (bump test) will produce inaccurate readings. This means that higher levels of the 

gas being monitored may be present and could result in overexposure and 

cause sickness or death. For proper use, see 

supervisor, User Instructions or call 3M in U.S.A., 1-800-243-4630. In Canada, call Technical Service at 1-800-267-4414.

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Zero the Sensor

1.  Remove the Philips screw on the front of the 3M™ Macurco™ GD-6 Combustible Gas Detector. Pull the front cover of the 

unit off.

2.  To select Calibration Zero Mode (

000), from normal mode, press the Next button four times to get to CaL or Calibration Mode. 

3.  Then press the 

Enter button to get to “000” - Calibration Zero Mode. 

4.  Press the 

Enter button and the display will read alternating with 000 (blinking) indicating zero calibration in progress 

(max 165 sec). 

5.  If the process is successful, the display will read 

__0 alternating with paS (blinking) Zero Calibration complete. 

6.  If the process was not successful the display will read 

__1 alternating with Fail (blinking) Zero Failed. If this occurs, repeat 

steps2through4.IfthesensorfailstozerotwicecontactTechnicalAssistance:1-800-237-9049.

7.  To return to Normal Mode press 

Enter and then press Next until “End” is displayed. Press Enter to return to Normal Mode.

Calibration 

1.  Remove the Philips screw on the front of the 3M™ Macurco™ GD-6 Combustible Gas Detector. Pull the front cover of the unit off.
2.  Assemble the 10% LEL gas cylinder and regulator together. Ensure that the gas used for calibration matches the gas that the 

3M™Macurco™GD-6CombustibleGasDetectorisconfiguredto(mE,ProorHy).

3.  Check the pressure gauge on the regulator. If you have 25psi or less you will need to replace the gas canister.
4. PlacethetestHoodfromtheregulatoroverthegassensor.
5.  To select Calibration Span Mode (

Spn), from normal mode, press the Next button four times to get to CaL or Calibration Mode. 

6.  Press the 

Enter button to get to “000” Calibration Zero Mode, then press the Next button to get to “Spn” - Calibration  

Span Mode.


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7.  Press the 

Enter button and the display will read 10 alternating with the gas, mE, pro or Hy (blinking), indicating the sensor 

is looking for gas. 

8.  Start applying gas to the gas sensor.
note: The sensor will look for the gas for 45 seconds. If no gas is applied or detected in that time, the display will return 

to CaL.
9.  When the sensor detects the gas, the display will flash back and forth between the 

gas concentration and Spn and the 

calibration will progress. The display will show this for a maximum of 165 seconds.

10.  When the calibration is successful, the display will flash back and forth between 

10 and paS.

11.  Remove the gas. The display will return to “

Spn”, then normal mode. The calibration is done.

12.  If the calibration fails, the display will flash back and forth between the gas concentration and 

FaL (fail). If this occurs, 

checkthepressuregaugeontheregulator.Ifthepressureislessthan25psitheflowofgasmaynotbeadequateto

properly calibrate the unit. If there is proper pressure in the cylinder repeat steps 4 through 11. If the unit fails to calibrate 

twice contact 3M Macurco Technical Assistance at 1-800-237-9049.

13.  Disassemble the cylinder and regulator.
14.  Re-assemble the 3M™ Macurco™ GD-6 Combustible Gas Detector (make sure the LED is aligned with the hole in the 

front case).

15.  See Calibration Flowchart.
3M FIXED GaS DETECTIon proDUCTS LIMITED WarranTY

3M warrants the GD-6 gas detector will be free from defective materials and workmanship for a period of two (2) years from 

date of manufacture (indicated on the inside cover of the GD-6), provided it is maintained and used in accordance with 3M 

instructions and/or recommendations. If any component becomes defective during the warranty period, it will be replaced or 

repaired free of charge, if the unit is returned in accordance with the instructions below. This warranty does not apply to units 

thathavebeenalteredorhadrepairattempted,orthathavebeensubjectedtoabuse,accidentalorotherwise.Theabove

warrantyisinlieuofallotherexpresswarranties,obligationsorliabilities.THEIMPLIEDWARRANTIESOFMERCHANTABILITY

ANDFITNESSFORPARTICULARPURPOSEARELIMITEDTOAPERIODOFTWO(2)YEARSFROMTHEPURCHASEDATE.3Mshall

notbeliableforanyincidentalorconsequentialdamagesforbreachofthisoranyotherwarranty,expressorimplied,arising

out of or related to the use of said gas detector. Manufacturer or its agent’s liability shall be limited to replacement or repair 

as set forth above. Buyer’s sole and exclusive remedies are return of the goods and repayment of the price, or repair and 

replacement of non-conforming goods or parts.

For MorE InForMaTIon 

In United States, contact:

Website:www.3M.com/OccSafety 

TechnicalAssistance:1-800-243-4630

For other 3M products: 

1-800-3M-HELPSor 

1-651-737-6501


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24


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3M occupational Health and  

Environmental Safety Division

3M Center, Building 0235-02-W-70

St. Paul, MN 55144-1000

Printed in U.S.A.

© 3M 2008-2011. All rights reserved.

3M and Macurco are trademarks of 3M Company, used under license in Canada. 

34-8707-5862-9


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requester:  

Farrel Allen

Creator:  

deZinnia

File name:  34870758629.indd
Structure #:  SS-41964
Date:  6/17/11

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Match Colors:

 

This artwork has been created as requested by 3M. 
3M is responsible for the artwork aS approVED and 
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