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GF Signet 5700 Instructions Manual

Made by: GF Signet
Type: Instructions
Category: Monitor
Pages: 12
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English 

Signet 5700 pH/ORP Monitor - ORP Instructions

V +

Red Wire

V -

Black wire

T -

White wire

T +

Green wire

mV Input

Brown wire

Iso. Gnd

Blue wire

-

+

pH/ORP

Blue

Black 

Red

Brown

White 

Green 

Twist-Lock
Electrodes

Preamp:
Signet 2720

4-20 

mA

Silver (earth ground)

5700 
Terminals

DryLoc
Electrodes

Preamp:
Signet 2760-1
Signet 2760-2

CAUTION!

•  Refer to instruction manual for more details.
•  Remove power to unit before wiring input and output 

connections.

• 

Follow instructions carefully to avoid personal injury.

1.  Power Connections

2.  Compatible Electrode/Preamp Wiring

= Double Insulated

= DC or AC power

Technical Notes:

• 

To reduce the possibility of noise interference, isolate AC power lines from signal lines.

• 

Maximum 4-20 mA loop impedance (sec. 3) is affected by the supply voltage.

• 

Use six conductor shielded cable for cable extensions up to 120 m (400 ft) max. (#5523-0064)

• 

Cable shield must be maintained through cable splice.

-

+

12-24 V

10 W

-

+

12 - 24 VDC

OR

12 - 24 VAC

5700 
Terminals

External power
supply

CAUTION!
Never connect 110 VAC or 220 VAC

 to 

rear power terminals.  High voltage AC 
will damage instrument and void warranty.  

Contents

 1.  Power Connections
  2.  Compatible Electrode/Preamp Wiring
  3.  4 - 20 mA Current Output Connections
 4.  Relay Connections 
  5.  Relay Operation  

 6.  Menu Functions 
 7.  Parts and 

Accessories 

 8.  Specifi cations
  9.  Quick Reference Menu Parameters 
 10.  Troubleshooting
 11.  Maintenance

Total
reset

AUX

output

PLS

output

1

2

Gnd

+

+

-

+

Gnd

Freq. IN

Sen. Pwr

.

Freq. IN

Iso. Gnd

Std. Sensor

        

  Patent No.  D376,328

     Flow

Open Collector 
Sensor

12-24 V

10 W

LISTED
77CJ

UL

 1   2   3   4   5   6

 1   2   3   4

 1   2

 1   2

Total
reset

AUX

output

PLS

output

1

2

Gnd

+

+

-

+

Gnd

Freq. IN

Sen. Pwr

.

Freq. IN

Iso. Gnd

Std. Sensor

        

  Patent No.  D376,328

     Flow

Open Collector 
Sensor

12-24 V

10 W

LISTED
77CJ

UL

 1   2   3   4   5   6

 1   2   3   4

 1   2

1.

2.

3.

Remove terminal blocks for easy wiring

*3-5700.090-1*

3-5700.090-1 

Rev. K 3/06 English/ORP

 


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 2

Signet 5700 pH/ORP Monitor - ORP Instructions

ORP

ORP

Low setpoint=

Adjustable hysteresis=

Relay energized=

Relay de-energized=

High setpoint=

Adjustable hysteresis=

Relay energized=

Relay de-energized=

-1000

 mV

+1000 

mV

Relay 1 or 
Relay 2

-500 mV

+500 mV

0 pulses

ORP

300 pulses

-1000 

mV

+1000 

mV

Relay 1 or 
Relay 2

+500 mV

-500 mV

ORP

300 pulses

0 pulses

Relay 1 Rate:

300 Pulses/min >

3

A.  LOW alarm mode 

The relay is energized when the ORP drops 
below the setpoint, and is de-energized when 
the ORP rises above the setpoint plus 
hysteresis (sec. 6.3D, 6.3E).

B.  HIGH alarm mode 

The relay is energized when the ORP rises 
above the setpoint and is  de-engergized 
when the ORP falls below the setpoint plus 
hysteresis (sec. 6.3D, 6.3E).

Example 2 (right): 
As the process ORP falls below the minimum pulse setpoint (+500 mV) the relay 
begins pulsing; triggering the metering pump for chemical addition.  As the ORP 
continues to decrease, pulsing accelerates proportionally until the maximum 
programmed pulse rate of 300 pulses/minute and setpoint (-500 mV) are 
reached, forcing the process ORP back up to intended levels (e.g. ≥ +500 mV). 

C.  Proportional PULSE mode
The proportional pulse relay configuration is primarily designed for metering pump control.  The 
operator is prompted to enter a minimum and maximum ORP setpoint and maximum pulse rate for 
the assigned relay (sec. 6.3F, 6.3G).  Relay pulse width is fixed at 130 ms.  Refer to the operation 
examples below.

•  Metering pump chemical addition (dry contact activation type required)

Example 1 (right):
As the process ORP rises above the minimum pulse setpoint (-500 mV) the relay 
begins pulsing; triggering the metering pump for chemical addition.  As the ORP 
continues to rise, pulsing accelerates proportionally until the maximum programmed 
pulse rate of 300 pulses/minute and setpoint (+500 mV) are reached, forcing the 
process ORP back down to intended levels (e.g. ≤ -500 mV).

5.  Relay Operation

4.  Relay Connections

Two internal relay contact sets (COM, NO, and NC) may be used 
for external device control. Front panel LED annunciators indicate 
the activation status of each relay.  Each relay can control up to 
two devices simultaneously, as shown. Relay operation modes 
include Low alarm, High alarm, and Proportional Pulse (sec. 5).  

Common device connections include:
•    Pulse mode - metering pump control
•    Pulse mode - solenoid valve control
•    Low or High mode - warning lamps
•    Low or High mode - bells or sirens
• 

Low or High mode - external heavy-duty relay

Wiring Example Right

Device A 

IS

 powered when relay 2 is de-energized (front panel 

LED “off”).  Power is discontinued when the relay 2 setpoint is 
reached (front panel LED “on”). Device B 

IS NOT

 powered when 

the relay 2 is de-energized.  Power is applied after the relay 2 
setpoint is reached.

+

-

-

Device

A

External AC/DC

power

+

-

+

Device

B

Relay 1

Relay 2

NC

C

NO

NC

C

NO

5700

Terminals

NC

C

NO

NC

C

NO

Relay 

De-energized

Relay 

Energized

Technical Notes:

• 

Maximum relay contact ratings:  5 A @ 30 VDC, 5 A @ 125 
VAC, or 3 A @ 250 VAC

• 

An external heavy-duty relay must be used for devices with 
surge currents or operating currents that exceed the above 
specifi cations.

3.  4 - 20 mA Current Output Connections

Technical Notes:

**1/8A fuse recommended (customer supplied)
*  4-20 mA output is internally powered (non-isolated), maximum 

loop impedance 350 Ω with a 12 V instrument supply voltage, 
950 Ω with a 24 V instrument supply voltage.  

To isolate output and prevent ground loop problems:
  1.  Use monitor device with isolated inputs, or
  2.  Use separate DC supply for 5700 and monitor device, or
  3.  Power 5700 with12 - 24 VAC step down transformer

-

+

pH/ORP

4-20 

mA

-

+

Fuse**

1/8A

4 - 20 mA

*

5700
Terminals

 


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3

Signet 5700 pH/ORP Monitor - ORP Instructions

6.  Menu Functions

To access either CALIBRATE or OPTIONS menus, press and hold 
the ENTER key as illustrated below:

Menus:
•  VIEW menu (sec. 6.1):

  The VIEW menu is displayed during 

standard operation. The operator can navigate freely through 
the menu by pressing either UP or DOWN arrow keys.

• CALIBRATE 

Menu 

(sec. 

6.3):

 The CALIBRATE menu contains 

all critical display setup and output parameters.  A simple secu-
rity code feature prevents unauthorized tampering. The operator 
is required to enter a simple access code for menu access. The 
same code also unlocks OPTIONS menus.

• OPTIONS 

Menu 

(sec. 

6.4):

 The OPTIONS menu contains 

setup and display features that are seldom accessed for minor 
display or output adjust-
ments.

• Reversible 

Dial

 

Your 5700 includes a 
reversible dial face for 
pH use.  See enclosed 
pH manual for opera-
tion details.

OPTIONS

(sec. 6.4)

CALIBRATE

(sec. 6.3)

VIEW

(sec. 6.1)

2

seconds

5

seconds

Press & hold ENTER key 
for access:

ENTER

6.1  VIEW Menu

Choose:

1

Change:

2

Save:

3

Buffer calibration

Loop output

Press and release to access
EASY CAL Procedure

Last calibration

Range

Relay 1

Relay 2

ORP mV/Raw mV

A.

B.

C.

D.

E.

F.

G.

↓G

↑A

Menu Displays A - G: 
(Factory default displays shown in 
menu column 1)

A.  Shows calibrated solution ORP 

mV and Raw (uncalibrated) input 
mV from ORP electrode/preampli-
fi er

B.  Loop output display: shows the 

loop current output level.

C.  ORP range display: shows the 

programmed min and max meter 
range (sec. 6.3A)

D.  Relay 1 display: this display 

shows the programmed opera-
tion mode and setpoint for relay 1 
(sec. 

 6.3D-E)

E.  Relay 2 display: this display 

shows the programmed opera-
tion mode and setpoint for relay 2 
(sec. 

 6.3D-E)

F.  Last calibration: this display 

shows a user defi ned setup date 
for 

 

maintenance records.  This 
feature is not an internal timer or 
calender.

G.  EASY CAL: press the right arrow 

key to access the EASY CAL 
buffer calibration procedure (sec. 
6.2).

See EASY CAL Procedure (Section 6.2)

B

A

D

C

ENTE

R

ALARM 1

ALARM 2

-

1000

ALARM 1

ALARM 2

0

pH

14

+1000

0 - 14 pH

ORP

 


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 4

Signet 5700 pH/ORP Monitor - ORP Instructions

quick 

press

Place electrode tip in 
first pH buffer saturated 
with Quinhydrone;

pH 7.0 ≈ 87 mV 
pH 4.0 ≈ 264 mV  

Allow for stabilization

Press

first buffer calibration.

to accept

To exit EASY CAL at any time 
without saving changes:

ENTER

Place electrode tip in 
second (different) pH 
buffer saturated with
Quinhydrone; 

pH 4.0 ≈ 264 mV 
pH 7.0 ≈ 87 mV

Allow for stabilization

Press

second buffer calibration.

ENTER

to accept

Display returns to VIEW
Menu in 3s

Press keys in sequence

 

 

will appear during code entry.

to continue,   

To Calibrate:

1

Response:

2

To Accept:

3

30 seconds*

30 seconds*

1

2

Displayed Data
•  ORP mV:  Shows the calibrated
  solution oxidation reduction  
 potentioal 

(ORP).

•  Input mV:  Shows the actual  
  Raw (uncalibrated) preamplifi er  
  ORP electrode input

Technical Note:

The differences between input mV and ORP mV is a good indication of the electrode's condition.  
Differences in excess of 50 mV may indicate a need to service the electrode.  Refer to electrode 
manual for maintenance recommendations.

6.2  EASY CAL Procedure

Requirements
•  This procedure simplifi es system calibration using standard pH 4.0 and 7.0 buffers saturated with 

Quinhydrone (customer supplied).  If standard pH 4.0 and 7.0 buffers and Quinhydrone are not 
available, the system can be calibrated using the CALIBRATE menu standard and slope settings 

 

(sec. 6.3B, 6.3C).

•  Quinhydrone (customer supplied) is the oxidizer measured by the ORP electrode and is essen-

tial for EASY CAL calibration.  To guarantee saturation with pH 4.0 and 7.0 buffers, mix 1/8 g (1/4 
mL) of Quinhydrone powder for each 50 mL of pH buffer solution (sec. 7).

For best results, gently stir the 
submerged electrode for 
approximately 5 seconds during 
the stabilization period (step 2).

Theoretical mV values
pH @ 25 °C  

 

 

mV

 

   +296

 

   +237

 

   +177

 

   +118

 

   +59

7  

 

 

 

0

 

   - 

59

 

   - 

118

10 

   - 

177

11 

 

   - 

237

12 

 

   - 

296

 


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5

Signet 5700 pH/ORP Monitor - ORP Instructions

6.3  CALIBRATE Menu

Requirements
System calibration is possible with two known ORP solutions within -1000 mV - +2000 mV.  The 
EASY CAL procedure (sec. 6.2) is recommended when standard pH buffers and Quinhydrone are 
available. If EASY CAL is performed, manual calibration steps B-C below are not required and 
should be skipped.  

Choose:

1

Change:

2

Save:

3

Allow for stabilization

Last calibration

quick 

press

To return to 
VIEW:

quick 

press

To restore original value:

Electrode standard

Optional

Allow for stabilization

Electrode slope

Range

Meter min→max

Press keys in sequence

           will appear during code entry.

to continue, 

Mode     Setpoint

Relay

Hysteresis

Relay

Pulse rate

Relay

Mode     Range

Relay

↓H

↑A

 Relay Low or High Mode Selected

Relay Pulse Mode Selected, step D

ENTER

"SAVING"

briefly

displays

A.

B.

C.

D.

E.

F.

G.

H.

Menu Settings A - H:

(Factory default displays shown in 

menu column 1)

A.  Sets Min → Max meter dial  

range, -1000 mV - +2000 mV 
(factory installed dial, -1000 mV - 

 

+1000 mV).  Contact factory for 
custom dial confi gurations.  

Does 

not effect 4 to 20 mA output

B.  Sets electrode standard to any 

value from -1000 mV to +2000 
mV (standard value must be 
≥120 mV from slope value,

 step 

C)

C.  Sets electrode slope to any value 

from -1000 mV to +2000 mV 
(slope value must be ≥120 mV 
from standard value, step B)

Menu items D-G repeat for relay 2 
setup.  

D.  Sets relay operation mode Low 

or High, and ORP (mV) setpoint,

 

-1000 mV - +2000 mV

 (sec. 

5A-B)

E.  Sets relay hysteresis, 00000 -
 

02000 mV.  Set to zero to disable 
feature (sec. 5A-B)

F. 

Sets relay minimum and maxi-
mum pulse setpoint, -1000 mV 
- +2000 mV (sec. 5C)

G.  Sets relay pulse rate, 000 - 300 

pulses/minute.  

H.  Sets user defi ned setup date 

for maintenance records.  This 
feature is not an internal timer or 
calender

Quick Reference Calibration Procedures:

2-Point Quick Calibration

 (recommended):

1.  Set solution standard (step B)
2.  Set solution slope (step C)

1-Point  Calibration

 (optional):

1.  Set solution standard (step B)

 


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 6

Signet 5700 pH/ORP Monitor - ORP Instructions

6.4  OPTIONS Menu

Choose:

1

Change:

2

Save:

3

quick 

press

To return to 
VIEW:

quick 

press

To restore original value:

Contrast

Low   --   --   --   --   --   High

Loop output

20 mA adjust

Press keys in sequence 

 

will appear during code entry.

to continue,   

Loop output

4 mA adjust

Loop output

4 mA setpoint

Loop output

20 mA setpoint

ENTER

"SAVING"

briefly

displays

A.

B.

C.

D.

E.

↓E

↑A

Menu Settings A - E:

(Factory default displays shown in 

menu column 1)

A.  Selects display contrast: 5 levels

B.  Sets 4 mA setpoint: -1000 - 
 

+2000 mV.  4 mA and 20 mA 
setpoints are reversible

C.  Sets 20 mA setpoint: -1000 -
 

+2000 mV.  20 mA and 4 mA 
setpoints are reversible

D.  Adjusts 4 mA output: 3.0 to 5.0 

mA (overrides factory 4.00 mA  
calibration)

E.  Adjusts 20 mA output: 19 to 21 

mA (overrides factory 20.00 mA  
calibration)

7.  Parts and Accessories

•  Power supply, 120 VAC - 24 VAC, #3-5000.075 
•  pH buffer kit, pH 4.0, 7.0, 10.0, #3-0700.390 (code 198 864 403)
•  Front snap-on bezel, #3-5000.525  (code 198 840 226)
•  5700 pH/ORP instruction sheet, #3-5700.090-1 (code 198 869 915)

Optional surface 
mount bracket #3-
5000.598
(code 198 840 225)

5 x 5 inch adapter plate for 
Signet retrofi t 
#3-5000.399
(code 198 840 224)

Splashproof rear cover 
#3-5000.395
(code 198 840 227)

 


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7

Signet 5700 pH/ORP Monitor - ORP Instructions

Side View

Mounting Clamp (2 ea.)

Optional Splashproof Rear Cover

#3-5000.395

88 mm
(3.5 in.)

Mounting Panel

Panel
Gasket

91 mm
(3.6 in.)

76 mm (3 in.)

88 mm (3.5 in.)

96 mm (3.8 in.)

96 mm
(3.8 in.)

Front View

96 mm (3.8 in.)

ENTER

RELAY 1

RELAY 2

ORP

-1000

-750

+750

-500

+500

-250

+250

0

+1000

Signet Monitor

8.  Specifi cations

General

Compatible sensors: Signet 3-2720 pH/ORP Preamplifi er/
  

 

Sensor 

System

Accuracy:   

±0.2% of full scale

Input range:
•  ORP:   

 

-1000 to +2000 mV, optically isolated 

   

                

(standard -1000 to +1000 mV dial included)

Enclosure:
•  Rating:  NEMA 4X/IP65 front
•  Dimensions:  1/4 DIN, 96 x 96 x 88 mm (3.8 x 3.8 x 3.5 in.)
•  Case:  ABS plastic
•  Keypad:  Sealed 4-key silicone rubber
•  Weight:  Approximately 500 g (18 oz.)

Display:
•  Type:  Microprocessor controlled air-core meter movement and  
  backlit Alpha-numeric 2 x 16 LCD  

 

• Update rate:  <1s
•  Contrast:  User selected
•  Relay annunciators: 2  LEDs

Environmental

Operating temp.:  -10  to 55 °C (14 to 131 °F), 50 °C (122 °F) with  
   

 optional rear cover

Storage temp.: 

-15 to 80 °C (5 to 176 °F)

Relative humidity: 0 to 95%, non-condensing
Altitude: 

4000 m max.

Pollution degree: 2

Dimensions

Electrical

Power requirements: 
•  12 to 24 VDC or 12 to 24 VAC, unregulated, 50-60 Hz, 
  10 W max.

Relay contacts (2 sets):  
• Mechanical SPDT contacts
•  Max. voltage rating: 5 A @ 30 VDC, 5 A @ 125 VAC, or 
  3 A @ 250 VAC, (power factor = 1.0)
•  Hysteresis: User adjustable

Current output: 
•  4 to 20 mA, non-isolated, internally powered, fully adjustable and  
 reversible
• Update rate:  <1s
•  Max loop impedance:  350 Ω with a 12 V instrument supply    
  voltage, 950 Ω with a 24 V instrument supply voltage
•  Accuracy: ±0.1% of max. range

Noise immunity: 

EN50082-2

Noise emissions: 

EN55011

Safety: EN61010-1

Agency Approvals

• CE, UL listed
• Manufactured under ISO 9001

(continued)

 


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 8

Signet 5700 pH/ORP Monitor - ORP Instructions

92 x 92 mm

(3.62 x 3.62 in.) 

Panel cutout

88 mm
(3.5 in.)

88 mm (3.5 in.)

Rear View

12-24 V

10 W

NC

C

NO

NC

C

NO

-

+

V +

Red Wire

V -

Black wire

-

+

T -

White wire

T +

Green wire

Iso. Gnd

Blue wire

mV Input

Brown wire

4-20 

mA

Relay 1

Relay 2

  

Patent No. D 376,328

     pH/ORP

Signet
Model #3-5700

LISTED
77CJ

U

L

®

Dimensions

9.  Quick Reference Menu Parameters

9.1  VIEW Menu Setup Parameters 

(sec. 6.1)

Menu

Parameters

Factory 

Default

Range

Display

Description

• ORP mV

• Raw 

sensor 

mV

Current loop

output

Min → Max meter 

and dial range

• Relay 1 mode 

• Relay 1 setpoint

• Relay 2 mode

• Relay 2 setpoint

Last calibration

date

EASY CAL 

procedure

• -1000 mV - +2000 mV
• -1000 mV - +2000 mV

3 - 21 mA

-1000 mV - 

+2000 mV

Low, High, or Pulse,

-1000 - +2000 mV

Low, High, or Pulse,

-1000 - +2000 mV

00 - 00 - 00 -

39 - 39 - 99

Two pH buffers saturated 

with Quinhydrone required:

pH 4= +87 mV, 

pH 7= +264 mV, 

(sec. 6.2)

n/a

n/a 

n/a 

-1000 mV -

+1000 mV

Low

-500 mV

High

+500 mV

01 - 01 - 98

n/a

A.

B.

C.

D.

E.

F.

G.

 


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9

Signet 5700 pH/ORP Monitor - ORP Instructions

9.2  CALIBRATE Menu Setup Parameters 

(sec. 6.3)

Menu

Parameters

Factory 

Default

Range

Display

Description

Min → max

meter/dial range

Manual electrode standard

calibration

Manual electrode slope

calibration 

• Relay 1 mode 

• Relay 1 setpoint

Relay 1 hysteresis

• Relay 1 mode
• Relay 1 range

Relay 1 

pulse rate

Last calibration

date

-1000 - 

+2000 mV

-1000 -

+2000 mV

-1000 -

+2000 mV

Low or High

-1000 - +2000 mV

00000 - 02000 mV

Pulse

-1000 - +2000 mV

000 - 300

pulses/minute

00 - 00 - 00 -

39 - 39 - 99

-1000 -

+1000 mV

n/a

n/a

Low

-500 mV

10 mV

-500 - +500 mV

120 

pulses/minute

01 - 01 - 98

A.

B.

C.

D.

E.

F.

G.

H.

9.3  OPTIONS Menu Setup Parameters 

(sec. 6.4)

Menu

Parameters

Factory 

Default

Range

Display

Description

Display contrast

4 mA setpoint

20 mA setpoint

4 mA adjust

20 mA adjust

0 to 5

-1000 - 

+2000 mV

-1000 -

+2000 mV

3.0 to 5.0 mA

19 to 21 mA

3

-1000 mV

+1000 mV

4.00 mA

20.00 mA

A.

B.

C.

D.

E.

Relay mode and 
setpoint displays 
repeat for relay 2 
setup

 


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 10

Signet 5700 pH/ORP Monitor - ORP Instructions

10.  Troubleshooting

(continued)

Display

Problem

Solution

1.   7.04 pH
      +25.0°C
      (Example↑)

pH electrode installed 
in preamplifi er

Remove pH electrode and replace with recommended ORP 
electrode (sec. 2).

2.   CHECK
      SENSOR ?

Electrode not installed in 
preamplifi er

mV input from preampli-
fi er
out of range
(≤ -1000 mV)

Missing or wrong 
electrode identifi cation
resistance applied to rear 
T+ and T- terminals.

1) Verify preamplifi er/electrode input connections and electrode 
installation (sec. 2).

2) Disconnect Green and White preamplifi er wires from rear T+ and
T- terminals.  Measure ORP electrode identifi cation resistance across 
disconnected wires for 9.0 kΩ - 10.8 kΩ.  If measured resistance 
is out of range:  
• Wrong electrode installed in preamplifi er (pH electrode = 3 kΩ @
25°C (77 °F))
• Faulty preamplifi er contacts, see preamplifi er manual for additional  
information
• Faulty electrode, see electrode manual for additonal information 

3) To verify instrument:
• Disconnect Green and White preamplifi er wires from rear T+ 
and T- terminals, then install a 10 kΩ fi xed resistor across the
terminals. 
• Disconnect Brown and Blue preamplifi er wires from rear mV Input 
and Iso. Gnd terminals.  Install shorting strap (jumper) across mV Input 
and Iso. Gnd terminals.  
• Power instrument and verify 0 mV on the “Input mV” display
(sec. 6.3B). If 0 mV ±5 mV are not displayed, the instrument requires 
factory calibration.  If “Input mV” are within ±5 mV, calibrate instrument 
“Set Standard” for 0 mV (sec. 6.3B). 
• If instrument displays correctly after calibration, instrument is ok;
preamplifi er and/or electrode problem exists.  Refer to preamplifi er and 
electrode manual for troubleshooting information.  

3.  Out Of Range
     Use Manual Cal

pH buffers other than pH 
4 and  7 saturated with 
Quinhydrone used during 
EASY CAL procedure; 
pH 4= +87 mV, 
pH 7= +264 mV

Use pH 4 and 7 buffers (ONLY) saturated with Quinhydrone for 
EASY CAL procedure (sec. 6.2).  The EASY CAL procedure simplifi es
manual Standard and Slope calibration in the CALIBRATE Menu 
(sec. 6).  The instrument can be calibrated using two buffers of    
known ORP by this method (sec. 6.3B, 6.3C).  If manual
calibration is performed, the EASY CAL procedure is not required.

4.   ! Same Buffer

Same pH buffer used for 
EASY CAL solution #1 
and solution #2

Use different buffer saturated with Quinhydrone for EASY CAL 
procedure solution #1 and solution #2 (sec. 7).  Do not calibrate  
both points with the same buffer!

5.  ORP: +2000 mV 
     Input: +2000 mV 
    (display stuck at
    +2000 mV)

Excessive mV input from 
preamplifi er

Faulty preamplifi er, refer to preamplifi er manual for additional informa-
tion 
To verify instrument input:
•  Disconnect Brown and Blue preamplifi er wires and install shorting 
   strap  (jumper) across rear mV input and Iso Gnd terminals.
• Power instrument and verify 0 mV on display.  If 0 mV is not 
   displayed, calibrate Standard input for 0 mV (sec. 6.3B)
• If instrument displays correctly after calibration, instrument is ok.
  If error condition persists, instrument requires factory service.

 


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11

Signet 5700 pH/ORP Monitor - ORP Instructions

11.  Maintenance

Clean the instrument case and front panel with a soft cloth and a mild soap solution.

Notes:

Display

Problem

Solution

6.   !  ORP must be
      2000  or  less

ORP (mV) input greater 
than +2000 mV, or improp-
erly entered during Stan-
dard or Slope calibration

A) Use solution of known ORP within -1000 - +2000 mV range
B) Enter mV value within -1000 mV - +2000 mV during stan-
dard or slope calibration (sec. 6.3B, 6.3C)

7.   Slope Too Close
      To Standard

ORP slope calibration too 
close to ORP standard 
calibration

(CALIBRATE Menu sec. 6.3 only)
Calibrate ORP slope using an ORP solution ≥120 mV from the 
ORP
standard solution (sec. 6.3C).

8.   Value Must Be
      -1000 Or More

Relay, 4 mA, or 20 mA 
ORP (mV) setpoint en-
tered out of range

Enter ORP setpoint within -1000 - +2000 mV range (sec. 6.3, 
6.4)

9.   Value Must Be
      2000 Or Less

Relay, 4 mA, or 20 mA 
ORP (mV) setpoint en-
tered out of range

Enter ORP setpoint within -1000 - +2000 mV range (sec. 6.3, 
6.4)

10.  Value Must Be
       300 Or Less

Relay pulse setting greater 
than 300 pulses per min-
ute

Enter relay pulse setting within 0 - 300 pulses per minute (sec. 
6.3F)

11.  SETUP READ
       ERROR
       Press any Key

Power fault occurred while 
saving setup menu entry

Press any key to reload factory defaults then reprogram sys-
tem setup parameters.

 

 

 


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George Fischer Signet, Inc. 3401 Aerojet Avenue, El Monte, CA  91731-2882  U.S.A.  •  Tel. (626) 571-2770  •  Fax (626) 573-2057
For Worldwide Sales and Service, visit our website:  www.gfsignet.com  •  Or call (in the U.S.):  (800) 854-4090

3-5700.090-1    Rev. K 3/06     English/ORP 

 © George Fischer Signet, Inc. 1999 

Printed in U.S.A. on recycled paper