+GF+ Signet 8850-3 Manual - User Manual

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SIDE VIEW

Field Mount w/
8052 Integral kit

92 mm
(3.6 in.)

97 mm

(3.8 in.)

56 mm
(2.2 in.)

41 mm
(1.6 in.

)

Optional
Rear
Cover

Panel Mount

SIDE VIEW

FRONT VIEW

96 mm

(3.8 in.)

96 mm
(3.8 in.)

Field Mount &

Panel Mount

SIDE VIEW

Field Mount w/
8050 Universal base

106 mm (4.2 in.)

42 mm

(1.7 in.)

64 mm

(2.5 in.)

82 mm
(3.23 in.)

8050

96 mm

(3.8 in.)

107 mm (4.2 in.)

42 mm

(1.7 in.)

65 mm

(2.5 in.)

8052

Signet 8850-3 Conductivity/Resistivity Transmitter

2. Specifi cations

General

Compatible electrodes: Signet 3-28XX-1 Standard and Certi

Series Conductivity/Resistivity Electrodes

Accuracy: ±2% of reading
Enclosure:
• Rating:

NEMA 4X/IP65 front

• Case:

PBT

• Panel Case Gasket: Neoprene
• Window:

Polyurethane coated polycarbonate

• Keypad:

Sealed 4-key silicone rubber

• Weight:

Approx. 325g (12 oz.)

Display:
•  Alphanumeric 2 x 16 LCD
•  Contrast: User selected, 5 levels
•  Update rate: 1.8 seconds

Electrical

• Power: 12 to 24 VDC ±10%, regulated, 100 mA max.
Sensor input range:
• Conductivity: 0.01

S/cm to 400 000

S/cm

• Resistivity:

10 K



•cm to 100 M



•cm

• TDS: 0.023 to 200 000 PPM nominal (adjustable

S/PPM)

• Temperature:

PT 1000, -25 °C to 120 °C (-13 °F to 248 °F)

Measurements above 10 M



(below 0.1

S) must be performed

in solution temperatures from 20 °C to 100 °C.

Two 4 to 20 mA Outputs:
• Passive, isolated, fully adjustable and reversible 4 to 20 mA

outputs are independently source selectable for conductivity or
temperature.

• Max Loop Impedance:



max. @ 12 V

325



max. @ 18 V

600



max. @ 24 V

•  Update Rate: 200 ms
•  Accuracy: ±0.03 mA @ 25°C, 24 V
Open-collector output, optically isolated:
•  50 mA max. sink, 30 VDC maximum pull-up voltage.
• Programmable

for:

• High or Low with adjustable hysteresis

• Pulse operation (max rate: 400 pulses/min).

Environmental

Operating Temperature:

-10 °C to 70 °C (14 °F to 158 °F)

Storage Tmperature:

-15 °C to 80 °C (5 °F to 176 °F)

Relative Humidity:

0 to 95%, non-condensing

• Maximum Altitude:

2000 m (6562 ft)

• Insulation

Category: II

• Pollution

Degree:

Standards and Approvals

• CE, UL listed
• Manufactured under ISO 9001 for Quality, ISO 14001 for

Environmental Management and OHSAS 18001 for Occupational
Health and Safety.

China RoHS (Go to www.gfsignet.com for details)

Declaration of Conformity according to FCC Part 15

This device complies with Part 15 of the FCC rules. Operation is
subject to the following two conditions:

(1) This device may not cause harmful interference, and,

(2) This device must accept any interference received, including
interference that may cause undesired operation.

Signet

Conductivity/Resistivity

Transmitter

ENTER

62.50 uS/cm

25.0 C

CAUTION!

• Remove power to unit before wiring

input and output connections.

• Follow instructions carefully to avoid

personal injury.

Contents

1. Installation
2. Speci

cations

3. Electrical Connections
4. Menu Functions

1. Installation

ProcessPro transmitters are available in two styles: panel mount and

eld mount. The panel mount is supplied with the necessary

hardware to install the transmitter. This manual includes complete panel mounting instructions.
Field mounting requires a separate mounting kit. The 3-8050 Universal kit enables the transmitter to be installed virtually
anywhere. Detailed instructions for

eld installation options are included with the 3-8050 Universal kit.

1.1 Panel

Installation

1. The panel mount transmitter is designed for installation using a 1/4 DIN Punch. For manual panel cutout, an adhesive

template is provided as an installation guide. Recommended clearance on all sides between instruments is 1 inch.

  2.  Place gasket on instrument, and install in panel.
  3.  Slide mounting bracket over back of instrument until quick-clips snap into latches on side of instrument.
  4.  To remove, secure instrument temporarily with tape from front or grip from rear of instrument. DO NOT RELEASE.

Press quick-clips outward and remove.

3-8850.090-3

Rev. K 11/12

English

*3-8850.090-3*

English

8850-3 Conductivity/Resistivity Transmitter

14
13
12
11

Shield (Sensor Gnd)
Black (Iso Gnd)
White (Temp In)
Red (Signal In)

Signet 28XX-1

Standard and Certified Cells

Terminals

3.1 Sensor Input Connections

≤ 30 m (100 ft)

Signet

Conductivity/Resistivity

Transmitter

ENTER

62.50 uS/cm

25.0 C

Sensr Gnd

(SHIELD)

Iso. Gnd

(BLACK)

Temp. IN

(WHITE)

Signal IN

(RED)

Output 2-

Output 2+

Output 1-

Output 1+

Loop 2-

Loop 2+

System Pwr

Loop -

System Pwr

Loop +

AUX

Power -

AUX

Power +

3. Electrical

Connections

Caution:

Failure to fully open terminal jaws before removing wire may permanently damage instrument.

Wiring Procedure
  1.  Remove 0.5 to 0.625 in. (13 to16 mm) of insulation from wire end.
  2.  Press the orange terminal lever downward with a small screwdriver to open terminal jaws.
  3.  Insert exposed (non-insulated) wire end in terminal hole until it bottoms out.
  4.  Release orange terminal lever to secure wire in place. Gently pull on each wire to ensure a good connection.

Wiring Removal Procedure
1. Press the orange terminal lever downward with a small screwdriver to open terminal jaws.
2. When fully open, remove wire from terminal.

Wiring Tips:

•  Do not route sensor cable in conduit containing AC power wiring. Electrical noise may interfere with sensor signal.
•  Routing sensor cable in grounded metal conduit will help prevent electrical noise and mechanical damage.
•  Seal cable entry points to prevent moisture damage.
•  Only one wire should be inserted into a terminal. Splice double wires outside the terminal.

2
1

Terminals 7-10: Open-collector Outputs

• Two transistor outputs, programmable as:

• High or Low setpoint with adjustable hysteresis

• Proportional Pulse (to 400 pulses per minute maximum)

• May be disabled (Off) if not used

Terminals 3–6: Loop Power

12 to 24 VDC ±10% system power

and current loop output.

Max. loop impedance:



max. @ 12 V

325



max. @ 18 V

600



max. @ 24 V

Terminals 11–14: Sensor Input

11 is conductivity input
12 is temperature input
13 is the isolated signal ground
14 is the sensor earth ground

Terminals 1–2: Auxiliary power

Provides DC power to measurement
circuit. Required for all 8850 systems

Internal open-collector

output circuit

Outputs

Isolation

15 Ω

8850-3 Conductivity/Resistivity Transmitter

3.2 System Power/Loop Connections

Stand-alone application, no current loop used

Transmitter

Terminals

Power

Supply

12 to 24 VDC

Connection to a PLC with built-in power supply

Internal

PLC Connection

Connection to a PLC/Recorder, separate supply

Example: Two transmitters connected to PLC/Recorder with separate power supply

PLC or Recorder

Loop 2 -

Loop 2 +

System Power Loop 1 -

System Power Loop 1 +

AUX Power -

AUX Power +

Transmitter

Terminals

Loop 2 -

Loop 2 +

System Power Loop 1 -

System Power Loop 1 +

AUX Power -

AUX Power +

Transmitter

Terminals

Loop 2 -

Loop 2 +

System Power Loop 1 -

System Power Loop 1 +

AUX Power -

AUX Power +

Loop 2 -

Loop 2 +

System Power Loop 1 -

System Power Loop 1 +

AUX Power -

AUX Power +

Loop 2 -

Loop 2 +

System Power Loop 1 -

System Power Loop 1 +

AUX Power -

AUX Power +

Power

Supply

12 to 24 VDC

PLC or Recorder

Channel 3
4 to 20 mA in

Channel 4
4 to 20 mA in

-
+

Transmitter 1

Terminals

Transmitter 2

Terminals

PLC Terminals

Channel 1

4 to 20 mA

+
-

Power

Supply

12 to 24 VDC

Channel 2

4 to 20 mA

+
-

-
+

Channel 2

4 to 20 mA

+
-

Channel 1

4 to 20 mA

-
+

Channel 1
4 to 20 mA in

Channel 2
4 to 20 mA in

+
-

Power

Supply

12 to 24 VDC

NC

NC

AUX power required for all 8850 systems

1mS
1M

10mS

100K

1,000mS

10,000mS

50,000mS

200,000mS

100mS

10K

400,000mS

100,000mS

0.054mS

18.3 M

Bottled

Water

Brackish Sea Water

(Salinity)

UPW @ 25°C

USP

Cooling Tower
Waste Waters

Deionization Regen. Chemicals

Alkali Cleaners, Acids/Bases

Rinse

Water

3-2819, 3-2839

(0.01 Cell)

3-2820, 3-2840

( 0.10 Cell)

3-2821, 3-2841

(1.0 Cell)

3-2822, 3-2842

(10.0 Cell)

3-2823

(20.0 Cell)

0.010mS

100 M

200mS

Select the sensor with the range that best straddles your
application requirements.
• 2818-1, 2839-1 (0.01 cell):

0.01 to 100

S/cm

(10

to 100 M

)

Use the 2818-1 or the 2839-1 for all resistivity requirements

• 2820-1, 2840-1 (0.1 cell):

1 to 1000

S/cm

• 2821-1, 2841-1 (1.0 cell):

10 to 10,000

S/cm

• 2822-1, 2842-1 (10.0 cell):

100 to 200,000

S/cm

• 2823-1 (20.0 cell):

200 to 400,000

S/cm

8850-3 Conductivity/Resistivity Transmitter

Signet

Conductivity/Resistivity

Transmitter

ENTER

62.50 uS/cm

25.0 C

VIEW menu

• During normal operation, ProcessPro displays the VIEW menu.
• When editing the CALIBRATE or OPTIONS menus, ProcessPro will return to the VIEW menu if no activity

occurs for 10 minutes.

•  To select a VIEW display, press the UP or DOWN arrow keys. The selections will scroll in a continuous loop.
•  Changing the VIEW display does not interrupt system operations.
•  No key code is necessary to change display selection.
•  Output settings cannot be edited from the VIEW menu.

Hysteresis

Time

Low Setpoint

Process

Relay energized

Relay relaxed

Hysteresis

Time

High Setpoint

Process

View Menu

Display

Description

Open Collector Output Rate:

0 to 100 Pulses/min.

endpoint

Pulse rate

0 pulses

100 pulses

Starting point

•

Proportional

Pulsing

The Open Collector output will generate a 100 mS pulse at the
rate de

ned by settings in the CALIBRATE menu.

In the example below:
•  The output will be 0 pulses/min. when value is less than 5.
•  The output will be 50 pulses/min. when value is 7.5.
•  The output will be 100 when value is greater than 10.

The starting point, endpoint and maximum pulse rate are
select able in the CALIBRATE menu.

3.3 Open Collector Outputs

The Open Collector output can be used as a switch that responds
when the process value moves above or below a setpoint, or it
can be used to generate a pulse at a rate proportional to the
process value.

•

Low:

Output triggers when process variable is less than the setpoint.
The output will relax when the process variable moves above the
setpoint plus the hysteresis value.

•

High:

Output triggers when process variable is greater than the
setpoint. The output will relax when the process variable moves
below the setpoint plus the hysteresis value.

123.45

S/cm

67.89

ºC

Monitor the Conductivity and temperature values from the sensor.

This is the Permanent display.

Monitor the Loop Current output.

Monitor the Loop2 Current output.

Check the Last Calibration date.

The VIEW displays below are temporary. The permanent display will return after 10 minutes

Loop1 Output:

13.75

Loop2 Output:

13.75

Last CAL:

04-20-10

8850-3 Conductivity/Resistivity Transmitter

Notes on Steps 5 and 6:

• All output functions remain active during editing.
• Only the

ashing element can be edited.

• RIGHT ARROW key advances the

ashing element in a continuous loop.

• Edited value is effective immediately after pressing ENTER key.
• If no key is pressed for 10 minutes unit will restore the last saved value and return to step 3.
• Step 6 (pressing ENTER key) always returns you to Step 3.
• Repeat steps 3-6 until all editing is completed.

Notes on Step 2:

If no key is pressed for 5 minutes while display is showing "Enter
Key Code", the display will return to the VIEW menu.

Notes on Steps 3 and 4:

• Refer to pages 6 and 7 for complete listing of menu items and their use.
• From the Step 3 display, pressing the UP and DOWN keys simultaneously will
return the display to the VIEW menu.
• If no key is pressed for 10 minutes, display will also return to the VIEW menu.

ProcessPro Editing Procedure:

Step 1.

Press and hold ENTER key:

• 2 seconds to select the CALIBRATE menu.

• 5 seconds to select the OPTIONS menu.

Step 2.

The Key Code is UP-UP-UP-DOWN keys in sequence.

• After entering the Key Code, the display will show the

rst item in the selected menu.

Step 3.

Scroll menu with UP or DOWN arrow keys.

Step 4.

Press RIGHT ARROW key to select menu item to be edited.

•

The

rst display element will begin

ashing.

Step 5.

Press UP or DOWN keys to edit the fl ashing element.

• RIGHT ARROW key advances the

ashing element.

Step 6.

Press ENTER key to save the new setting and return to Step 3.

OPTIONS

CALIBRATE

VIEW

Press &
hold for
access:

ENTER

Step 5

Step 6

Notes on Step 1:

• The View Menu is normally displayed.
• The CALIBRATE and OPTIONS menus require a KEY CODE.

Step 4

First item in
CALIBRATE menu

Step 3

Step 3: Finished Editing?

Press the UP and DOWN keys simultaneously after
saving the last setting to return to normal operation.

Press the UP and DOWN keys simultaneously
while any element is

ashing. This will recall the

last saved value of the item being edited and
return you to Step 3.

Step 5: Made an Error?

Output1 Setpnt:

0.00 uS

Output1 Setpnt:

0.00 uS

ENTER

Output1 Setpnt:

.00 uS

Output1 Setpnt:

.00 uS

Output1 Setpnt:

Saving

Output1 Setpnt:

19.00 uS >

20.0 uS

Output1 Setpnt:

Standard >

Cell Constant:

CALIBRATE: ----

Enter Key Code

CALIBRATE: *---

Enter Key Code

CALIBRATE: **--

Enter Key Code

CALIBRATE: ***-

Enter Key Code

Standard >

Cell Constant:

8850-3 Conductivity/Resistivity Transmitter

Select CUSTOM only if you are connecting a certi

ed conductivity sensor. Select STANDARD

for

all

other

systems.

For STANDARD sensors: Select from these options: 0.01, 0.1, 1.0, 10.0 or 20.0.

For CUSTOM sensors: Enter the precise cell constant from the certi

cate provided with your

sensor, or from the information label on the sensor.

Select from the following options:

S, mS, k

, M

, PPM.

If the Units selection is PPM, you can set the ratio of Total Dissolved Solids to

S. See

section 3 of this manual for additional information. The TDS factor can only be set in PPM.

Adjust the temperature of the system based on an accurate external reference.

For use with STANDARD sensors: Perform this single-point wet calibration for most accurate

results. Not required for CUSTOM sensors except for periodic system accuracy con

rmation.

Enter all zeroes to restore factory calibration to TEMP and COND settings.

Select the input source to be associated with the current loop output: Conductivity or

Temperature.

Select the minimum and maximum values for the current loop output.

Be sure to modify this setting if you change the Cond. Units.

Select the source for the Open Collector output: Conductivity or Temperature.

Select the mode of operation for the Open Collector output.

Options available are High, Low or proportional Pulse.

The signal may be disabled (Off) if not in use.

In Low or High Mode, this Open Collector output will be activated when the process reaches

this value. Be sure to modify this setting if you change the Cond. Units.

The Open Collector output will be deactivated at Setpoint ± Hysteresis, depending on High or

Low Setpoint selection. (See details on page 4.)

In Pulse mode, set the process values where the proportional pulse will start and where it will

reach the maximum rate. Be sure to modify this setting if you change the Cond. Units.

In Pulse mode, set the maximum rate for the proportional Pulse output. The 8850 will accept

any value from 0 to 400.

Use this “note pad” to record important dates, such as annual recerti

cation or scheduled

maintenance.

Calibrate Menu

Display

(Factory settings shown)

Description

Cell

Constant:

Standard >

Cell:

Standard

1 >

Cell: Custom

1.0000 >

Cond Units:

uS >

PPM Factor:

2.00 >

Set:

Temperature >

Set:

Conductivity >

Loop1 Source:

Cond >

Loop1 Range: uS

0.0000

→

100.000 >

Output1 Source:

Cond >

Output1 Mode:

Low >

Output1 Setpnt:

10.0000

uS >

Output1 Hys:

0.5000

uS >

Output1 Rng: uS

10.0000

→

40.0000 >

Output1 PlsRate:

120

Pulses/Min >

Last

CAL:

04-20-10 >

Settings will repeat for Loop 2 and Output 2.

8850-3 Conductivity/Resistivity Transmitter

Contrast:
3 >

Cond

Decimal:

****.* >

Averaging

Off >

Loop1 Adjust:
4.00

mA >

Loop1 Adjust:
20.00

mA >

Temp

Display:

ºC >

Temperature

Comp %: 2.00

Output1

Active:

Low >

Test Loop 1:

Test Output 1:

Adjust the LCD contrast for best viewing. A setting of 1 is lower contrast, 5 is higher. In

general, select lower contrast if the display is in warmer ambient surroundings.

Set the decimal to the best resolution for your application. The display will automatically

scale down to this restriction. Select *****., ****.*, ***.** **.*** or *.**** .

OFF provides the most instantaneous response to process changes. Select LOW (4 sec)

or HIGH (8 sec) averaging if your process experiences frequent or extreme

uctuations.

Adjust the minimum and maximum current output. The display value represents the

precise current output. Adjustment limits:

• 3.80 mA < 4.00 mA > 5.00 mA

• 19.00 mA < 20.00 mA > 21.00 mA

Use this setting to match the system output to any external device.

Select ºC or ºF.

Set the percent change in Conductivity caused by a 1ºC change in temperature. May be

from 0.00 to 10.00.

Active HIGH: This setting is used to turn a device (pump, valve) ON at the setpoint.

Active LOW: This setting is used to turn a device OFF at the setpoint.

Press UP and DOWN keys to manually order any output current value from

3.8 mA to 21.00 mA to test the output loop.

Press UP and DOWN keys to manually toggle the Open Collector output state.

Options Menu

Display

(Factory settings shown)

Description

Settings will repeat for Loop 2 and Output 2.

8850-3 Conductivity/Resistivity Transmitter

Calibration Procedure

This instrument has been electronically calibrated at the factory.
• Procedure

veri

es the accuracy and linearity of the instrument by simulating temperature and conductivity values with precision

(±0.1%)

xed resistors.

• Procedure B is a wet calibration. This procedure uses the sensor input and NIST traceable test solutions. When done correctly, this

procedure offers the most accurate system calibration.

Iso. Gnd

(BLACK)

Temp. IN

(WHITE)

Signal IN

(RED)

Simulation resistor

TC resistor

B) Wet Calibration with NIST Traceable Solutions:

When using NIST traceable standards, review the temperature information provided with the test solution. Prevent contamination of the
test solution. The sensor must be at the temperature speci

ed on the test solution label.

•  Remove the sensor from the system. Rinse the sensor in a small amount of test solution.
•  Place the sensor into the test solution.
•  Place a reference thermometer into the same solution.
• Allow

suf

cient time for the temperature to stabilize.

• Set Temp:

Adjust the temperature value based on the reference thermometer. (see Editing Procedure.)

• Set Cond:

Adjust the conductivity value based on the test solution value. (see Editing Procedure.)

• Verify the linearity by placing the sensor into a second test solution of a different value.
• If the instrument does not display the correct value (Temperature ± 0.5 ºC, Conductivity ± 2% of reading), service is required.

A) Accuracy Verifi cation with Precision Resistors (Electronic Calibration):
1. Simulate the Temperature

The temperature input to the 8850 is a PT-1000 thermistor, where 1000 Ohms (



) is equal to 0 ºC and a change of 3.84



equals a

1 ºC change. (1000



= 0 ºC, 1003.84



= 1.0 ºC, 1007.68



= 2.0 ºC...................1096



= 25 ºC)

• Connect a resistor (1000



to 1096



) between "Temp IN" and "Iso. Gnd" terminals.

• Set Temp;

Adjust the temperature to exact value based on the measured resistance. (see Editing Procedure, Calibrate menu).

• To verify the temperature linearity, connect a second resistor value to the terminals.
• If the instrument does not display the correct value, service is required. ( ± 0.5ºC)

2. Simulate the Conductivity

You may calculate the exact Resistance needed to simulate a speci

c conductivity value , or you may calculate the exact Conductivity

based on a resistor value:

Resistance

= Cell constant

e.g.

0.1 Cell

= 5,000



or 5 K



conductivity

(Siemens*)

0.000020

(Siemens*)

Conductivity

Sensor cell

e.g.

0.1 Cell

= 0.000001 Siemens*

Simulation resistance (

)

100,000 (

)

or 1

S/cm

(*1

S = 1 X 10

-6

Siemens or 0.000001 Siemens)

• Connect the conductivity resistor between the "Signal IN " and "Iso Gnd" terminals.
• Set Cond:

Adjust the conductivity value based on the resistor value. (see Editing

Procedure and Calibrate menu).

• Verify the linearity of the instrument by connecting a second resistor of a different value.
• If the instrument does not display the correct value (± 2% of reading), service is required.

8850-3 Conductivity/Resistivity Transmitter

Parts Per Million (PPM) Factor

This feature is only applicable when PPM display units are selected. The programmable PPM Factor is adjustable from 0.01 to
3.00 (factory default = 2.00).

Determine the best PPM Factor for a process solution by calculating the solution's conductivity (

S) and the percent of total

dissolved solids (PPM).

PPM Factor = Solution conductivity (

S/cm)

Total dissolved solids (PPM)

TDS (PPM) =

Solution conductivity (

S/cm)

PPM Factor

Example:

• Solution conductivity = 400

S/cm

• TDS = 200 PPM (mg/L)

PPM Factor = 400

S/cm =

2.00

200

PPM

Temperature Coeffi cient

Conductivity measurement is highly dependent on temperature. Temperature dependence is expressed as the relative change per °C,
commonly known as percent/°C change from 25 °C, or slope of the solution.

Slopes can vary signi

cantly depending on process solution type. The factory default temperature compensation factor is 2.00%/°C.

Process solutions may require adjustment for maximum accuracy. To determine the optimum temperature compensation factor for a
process:

Disable the 8850 temperature compensation % factor by entering 0.00.

Heat the sample solution close to the maximum process temperature. Place sensor in the sample solution allowing several

minutes for stabilization. Access the VIEW menu and record the displayed temperature and conductivity values in the spaces
provided:

Displayed temperature:

T1 = _______ °C

Displayed conductivity:

C1 = _______

(Do not use this procedure for solutions from 0.055

S to 0.1

S (10 M



to 18 M



). An internal pure water curve is used for these

ranges. The factory default setting of 2.00%/°C should be used.)

Cool the sample solution close to the minimum process temperature. Place sensor in the sample solution allowing several

minutes for stabilization. Record displayed temperature and conductivity values in the spaces provided:

Displayed temperature:

T2 = _______ °C

Displayed conductivity:

C2 = _______

(A 10% change in conductivity between steps 2 and 3 is recommended.)

Substitute recorded readings (steps 2 and 3) into the following formula:

TC Slope = 100 x (C1 - C2)

(C2 x (T1 - 25)) - (C1 x (T2 - 25))

Example: A sample solution has a conductivity of 205

S @ 48°C. After cooling the solution, the conductivity was measured at

150

S @ 23 °C. (C1 = 205, T1 = 48, C2 = 150, T2 = 23)

The TC is calculated as follows:

TC Slope = 100 x (205 - 150) = 5500 =

1.42%/°C

(150 x (48 - 25)) - (205 x (23 - 25)) 3860

8850-3 Conductivity/Resistivity Transmitter

Display Condition

Suggested Solutions

Possible Causes

"- - - -"

Value Must be less
than 3

Value must be greater than 0

"Value must be
400 or less"

Display erratic, shows "0" or
"------"

intermittently

"Too much Error
Check Sensor"

Display is over range. This may be a
normal condition if your process operates
at/near the limits of the sensor range.
k

or M

units selected and sensor is

open.

The PPM factor must be a value from
0.00 to 3.00.

Custom cell constant cannot be set to 0.

Pulse Rate cannot be greater than 400.

Aux Power not connected.

•  Defective or dirty/coated sensor.
• Wiring error.
•  Fluid conductivity too low.
•  Defective temp element.

•  Check sensor for correct range.
•  Check Decimal setting in OPTIONS menu.
  Check Calibrate menu settings for incompatible

SOURCE and RANGE values.

Set a PPM value less than 3.

Set cell constant to a value greater than 0.

Set a pulse rate value less than 400.

Wire 8850 according to diagram (Section 3.1).

• Clean or replace sensor.
• Check and correct wiring.

• Replace sensor.

Troubleshooting

If a Current Loop is locked at 3.6 mA, the problem is related to the temperature circuit:
This occurs only if the 8850 detects a resistance from the temperature sensor that is less than 250



or greater than 2800



•  Check the sensor wiring for open/short or poor connections on white (TEMP IN) and black (ISO GND)wires.
•  The PT1000 temperature device in the sensor is defective.
•  The transmitter is defective.

Auxiliary Power (terminals 1 and 2) must ALWAYS be connected for the 8850 to operate.

Technical notes

8850-3 Conductivity/Resistivity Transmitter

Notes

Georg Fischer Signet LLC, 3401 Aero Jet 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
For the most up-to-date information, please refer to our website at www.gfsignet.com

3-8850.090-3 Rev. K 11/12 English

Ordering Information

Mfr.

Part

Code

Description

3-8850-3

159 000 232

Conductivity/Resistivity Field mount with single input/dual output

3-8850-3P

159 000 233

Conductivity/Resistivity Panel mount with single input/dual output

Parts and Accessories

Mfr.

Part

Code

Description

3-8050

159 000 184

Universal mounting kit

3-8050.395

159 000 186

Splashproof rear cover

3-8052

159 000 188

3/4” Integral mounting kit

3-8052-1

159 000 755

3/4" NPT mount junction box

3-0000.596

159 000 641

Heavy duty wall mount bracket

3-8050.392

159 000 640

Model 200 retro

t adapter

3-5000.598

198 840 225

Surface mount bracket

3-5000.399

198 840 224

5 x 5 inch adapter plate for Signet retro

3-9000.392

159 000 368

Liquid-tight connector kit, 3 sets, 1/2 in. NPT

3-9000.392-1

159 000 839

Liquid-tight connector kit, 1 set, 1/2 in. NPT

3-9000.392-2

159 000 841

Liquid-tight connector kit, 1 set, PG 13.5

7300-7524

159 000 687

24 VDC Power Supply 7.5 W, 300mA

7300-1524

159 000 688

24 VDC Power Supply 15 W, 600mA

7300-3024

159 000 689

24 VDC Power Supply 30 W, 1.3 A

7300-5024

159 000 690

24 VDC Power Supply 50 W, 2.1 A

7300-1024

159 000 691

24 VDC Power Supply 100 W, 4.2 A

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