GF Signet ProcessPro 8850-2 User manual

Signet
Conductivity/Resistivity
Transmitter
ENTER
62.50 uS/cm
25.0 C
Signet 8850-2 Conductivity/Resistivity Transmitter
2. Specifications
General
Compatible electrodes: Signet 3-28XX-1 Standard and Certified
(NIST) Series Conductivity/Resistivity Electrodes
Accuracy: ±2% of reading
Enclosure:
• Case: PBT
• Panel gasket: Neoprene
• Window: Polyurethane coated polycarbonate
• Keypad: Sealed 4-key silicone rubber
• Weight: Approx. 325 g (12 oz.)
Display:
• Type: Alphanumeric 2 x 16 LCD
• Contrast: User selected, 5 levels
• Update rate: 1.8 s
Electrical
Power: 12 to 24 VDC ±10%, regulated, 290 mA max.
Sensor input range:
• Conductivity: 0.01 μS/cm to 400 000 μS/cm
• Resistivity: 10 KΩ/cm to 100 MΩ/cm
• TDS: 0.023 to 200 000 PPM nominal
(adjustable μS/PPM)
• Temperature: PT 1000, -25 to 120 °C (-13 to 248 °F)
Measurements above 10 MΩ(below 0.1 μS) must be
performed in solution temperatures from 20 to 100 °C.
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: 50 Ωmax. @ 12 V
325 Ωmax. @ 18 V
600 Ωmax. @ 24 V
• Update rate: 200 ms
• Accuracy: ±0.03 mA @ 25 °C, 24 V
Relay outputs (2 sets mechanical SPDT contacts):
• Max. voltage rating: 5 A @ 30 VDC or
5 A @ 250 VAC, resistive load
• Hi or Lo programmable with adjustable hysteresis
• Pulse programmable (maximum 400 pulses/minute)
Environmental
• Operating temperature: -10 to 70 °C (14 to 158 °F)
• Storage temperature: -15 to 80 °C (5 to 176 °F)
• Relative humidity: 0 to 95%, non-condensing
• Maximum altitude: 2000 m (6562 ft)
• Rating: NEMA 4X/IP65 front
• Insulation category: II
• Pollution degree: 2
Standards and Approvals
• CE, UL, CUL listed
• RoHS compliant
• Manufactured under ISO 9001 and ISO 14001
CAUTION!
• Remove power to unit before wiring input
and output connections.
• Follow instructions carefully to avoid
personal injury.
Contents
1. Installation
2. Specifications
3. Electrical Connections
4. Menu Functions
1. Installation
ProcessPro transmitters are available in two styles: panel mount and field 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 (159 000 184) enables the transmitter to be installed
virtually anywhere. Detailed instructions for field 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.
Output -
Output +
System Pwr
Loop -
System Pwr
Loop +
2
14
3
Sensr Gnd
(SHIELD)
Sensr IN
(RED)
Sensr V+
(BLACK)
7
6
5
8050
106 mm (4.2 in.)
42 mm
(1.7 in.) 64 mm (2.5 in.)
92 mm
(3.6 in.)
97 mm
(3.8 in.)
56 mm
(2.2 in.)
41 mm
(1.6 in.
)
Optional
Rear
Cover
96 mm
(3.8 in.)
96 mm
(3.8 in.)
quick-clips
gasket panel
terminals mounting
bracket
latch
Panel Mount
Installation Detail
82 mm
(3.23 in.)
SIDE VIEW
Field Mount Panel Mount
SIDE VIEW
FRONT VIEW
Field Mount &
Panel Mount
3-8850.090-2 Rev. J 4/12 English
*3-8850.090-2*
English
Chinese RoHS (Go to www.gfsignet.com for details)

2 8850-2 Conductivity/Resistivity Transmitter
3.1 Sensor Input Connections
14
13
12
11
Shield (Sensor Gnd)
Black (Iso Gnd)
White (Temp In)
Red (Signal In)
Signet 28XX-1
Standard and Certified Cells
Terminals
Signet
Conductivity/Resistivity
Transmitter
ENTER
62.50 uS/cm
25.0 C PIW
4
3
2
1
14
13
12
11
10
9
8
7
6
5
System Pwr
Loop -
System Pwr
Loop +
AUX
Power -
AUX
Power +
Sensr Gnd
(SHIELD)
Iso. Gnd
(BLACK)
Temp. IN
(WHITE)
Signal IN
(RED)
Relay 2
(NO)
Relay 2
(COM)
Relay 2
(NC)
Relay 1
(NO)
Relay 1
(COM)
Relay 1
(NC)
3. Electrical Connections
Caution: Failure to fully open terminal jaws before removing wire may permanently damage instrument.
Wiring Procedure
1. Remove 13 to 16 mm (0.5 to 0.625 in.) 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 5-10: Relay Outputs
Two SPDT mechanical relays, programmable as:
• High or Low setpoint with adjustable hysteresis.
• Proportional Pulse (400 pulses per minute maximum).
• May be disabled (Off) if not used.
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.
Cable length is limited to 7.5 m (25 ft.)
where the operating range is above 10MΩ.
Terminals 3 and 4: Loop Power
12-24 VDC ±10% system power
and current loop output.
Max. loop impedance:
50 Ωmax. @ 12 V
325 Ωmax. @ 18 V
600 Ωmax. @ 24 V

3
8850-2 Conductivity/Resistivity Transmitter
3.2 System Power/Loop Connections
-
+
4
3
2
1
4
3
2
1
-
+
4
3
2
1
+
-
+
-
-
+
4
3
2
1
4
3
2
1
4
3
2
1
+
-
-
+
-
+
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
Channel 2
4-20 mA in
Stand-alone application, no current loop used
(NOTE: AUX power must be connected to the power supply for the relays to function.)
Transmitter
Terminals
Power
Supply
12-24 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 Input
4-20 mA
System Pwr Loop -
System Pwr Loop +
AUX Power -
AUX Power +
Transmitter
Terminals
Power
Supply
12-24 VDC
System Pwr Loop -
System Pwr Loop +
AUX Power -
AUX Power +
AUX power required for all 8850-2 systems
PLC or Recorder
Channel 1
4-20 mA in
Transmitter 1
Terminals
System Pwr Loop -
System Pwr Loop +
AUX Power -
AUX Power +
Transmitter 2
Terminals
PLC Terminals
Loop Input
4-20 mA
Transmitter
Terminals
System Pwr Loop -
System Pwr Loop +
AUX Power -
AUX Power + Power
Supply
12-24 VDC
Power
Supply
12-24 VDC
System Pwr Loop -
System Pwr Loop +
AUX Power -
AUX Power +
Red
Black
Red
Black
Black
Red
Black
Black
Red
Black
Black
Black
Select the sensor with the range that best suits your application
requirements.
• 2818, 2819-1, 2839-1 (0.01 cell): 0.01 to 100 μS
(10 kΩto 100 MΩ)
Use the 2818, 2819-1 or the 2839-1 for all resistivity requirements.
• 2820-1, 2840-1 (0.1 cell): 1 to 1000 μS
• 2821-1, 2841-1 (1.0 cell): 10 to 10,000 μS
• 2822-1, 2842-1 (10.0 cell): 100 to 200,000 μS
• 2823-1 (20.0 cell): 200 to 400,000 μS
1 μS
1 M
10 μS
100 K
1,000 μS 10,000 μS
50,000 μS 200,000 μS
100 μS
10 K
400,000 μS100,000 μS
0.054 μS
18.3 M
3-2818, 3-2819, 3-2839
3-2820, 3-2840
3-2821, 3-2841
3-2822, 3-2842
3-2823
0.010 μS
100 M
200 μS
(0.01 Cell)
( 0.10 Cell)
(1.0 Cell)
(10.0 Cell)
(20.0 Cell)
Bottled
Water
Brackish Sea Water
(Salinity)
UPW @ 25°C
USP
Cooling Tower
Waste Waters
Deionization Regen. Chemicals
Alkali Cleaners, Acids/Bases
Rinse
Water

4 8850-2 Conductivity/Resistivity Transmitter
Hysteresis
Time
Low Setpoint
Process
Relay energized
Relay de-energized
Hysteresis
Time
High Setpoint
Process
3.3 Relay Output
The relays can be used as a switch that responds when the
process value moves above or below a setpoint, or to generate a
pulse at a rate proportional to the process value.
• Low:
Relay triggers when process is less than the setpoint.
The relay will de-energize when the process moves above the
setpoint plus the hysteresis value.
• High:
Relay triggers when process is greater than the setpoint.
The relay will de-energize when the process moves below the
setpoint plus the hysteresis value.
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 ▲or ▼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.
• Proportional Pulsing
The relay will generate a 100 mS pulse at the rate defined 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.
10
5
0 pulses
Relay Output Rate:
0 to 100 Pulses/min.
endpoint
100 pulses
Starting point
Pulse rate
View Menu
Display Description
1234.5 μS/cm
12.6 °C
Monitor the Conductivity and the Temperature input from the sensor.
This is the Permanent display.
All of the displays below are temporary. After 10 minutes the display returns to the permanent display.
Loop Output
14.16 mA Monitor the 4 to 20 mA Loop output.
Last CAL:
02-10-09
Monitor date for scheduled maintenance or date of last calibration.
(See description in Calibrate Menu.)

5
8850-2 Conductivity/Resistivity Transmitter
Notes on Steps 5 and 6:
• All output functions remain active during editing.
• Only the flashing element can be edited.
• ►key advances the flashing 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 ▲and ▼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 ▲-▲-▲-▼keys in sequence.
• After entering the Key Code, the display will show the first item in the selected menu.
Step 3. Scroll menu with ▲or ▼arrow keys.
Step 4. Press ►key to select menu item to be edited.
• The first display element will begin flashing.
Step 5. Press ▲or ▼keys to edit the flashing element.
•►key advances the flashing element.
Step 6. Press ENTER key to save the new setting and return to Step 3.
2s 5s
ENTER
OPTIONS
CALIBRATE
VIEW
Press &
hold for
access:
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 ▲and ▼keys simultaneously after saving
the last setting to return to normal operation.
Press the ▲and ▼keys simultaneously while any
element is flashing. This will recall the last saved
value of the item being edited and return you to
Step 3.
Step 5: Made an Error?
Relay1 Setpnt:
20.00 uS
Relay1 Setpnt:
10.00 uS
ENTER
Relay1 Setpnt:
10.00 uS
Relay1 Setpnt:
1
9
.00 uS
Relay1 Setpnt:
Saving
Relay1 Setpnt:
19.00 uS >
20.0 uS >
Relay1 Setpnt:
Standard >
Cell Constant:
CALIBRATE: ----
Enter Key Code
CALIBRATE: *---
Enter Key Code
CALIBRATE: **--
Enter Key Code
CALIBRATE: ***-
Enter Key Code
Standard >
Cell Constant:

6 8850-2 Conductivity/Resistivity Transmitter
Calibrate Menu
Display
(Factory settings shown) Description
Cell Constant
Standard >
Select CUSTOM only if you are connecting a certified conductivity sensor. Select STANDARD
for all other systems.
Cell: Standard
1 > For STANDARD sensors: Select from these options: 0.01, 0.1, 1.0, 10.0 or 20.0.
Cell: Custom
1.0000 >
For CUSTOM sensors: Enter the precise cell constant from the certificate provided with your
sensor, or from the information label on the sensor.
Cond Units
μS > Select from these options: μS, mS, kΩ, MΩor PPM.
PPM Factor
2.00 >
If the Units selection is PPM, set the ratio of Total Dissolved Solids to μS. The maximum
allowable is 3 μS = 1 PPM. The TDS factor can only be set in PPM. See page 9.
Set:
Temperature > Provides a maximum 25 ºC offset to match temperature measurement to external reference.
Set:
Conductivity >
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 confirmation.
Enter all zeroes to restore factory calibration to TEMP and COND settings.
Loop Source:
Cond >
Select the input (Conductivity or Temperature) source to be associated with the current
loop output.
Loop Range: μS
0.0000 › 100.00 >
Select the minimum and maximum values for the 4 to 20 mA current loop output. Be sure to
modify this setting if you change the Cond. Units.
Relay1 Source:
Cond > Select Conductivity or Temperature as the source for relay 1.
Relay1 Mode:
Low >
Select the mode of operation for relay 1: High, Low or Proportional Pulse.
The relay may be disabled (Off) if not in use.
Relay1 Setpnt:
10.0000 μS >
In Low or High Mode, the relay will be energized when the Conductivity reaches this value. Be
sure to modify this setting if you change the Cond. Units.
Relay1 Hys:
0.5000 μS >
In Low or High mode, the relay will be de-energized at Setpoint ± Hysteresis, depending on
High or Low Setpoint selection.
Relay1 Range: μS
10.0000 › 40.0000 >
If Relay 1 is in PULSE mode, set the start and end point of the range and also set the
maximum pulse rate. (The maximum PULSE rate setting is 400 pulses per minute.) Be sure to
modify this setting if you change the Cond. Units.
Relay1 PlsRate:
120 Pulses/min >
The combined Relay1 Range and Relay1 Pulse Rate settings shown here indicate:
"Start pulsing when the Conductivity value is 10 μS and increase the pulse rate up to the
maximum of 120 pulses per minute when the Conductivity value reaches 40 μS." The 8850
will accept any value from 0 to 400.
Last CAL:
02-10-09 >
Use this “note pad” to record important dates, such as annual recertification or scheduled
maintenance.
Settings repeat for Relay 2.

7
8850-2 Conductivity/Resistivity Transmitter
Options Menu
Display
(Factory settings shown) Description
Contrast:
3 >
Adjust the LCD contrast for best viewing. A setting of 1 is lowest contrast, 5 is highest. Select
lower contrast if the display is in warmer ambient surroundings.
Cond Decimal:
****.* >
Set the decimal to the best resolution for your application. The display will automatically scale
up to this restriction. Select *****., ****.*, ***.** **.*** or *.****.
Averaging
Off >
OFF provides the quickest output response to changes in temperature. Longer averaging
period produces more stable display and output response.
Temp Display
°C > Select temperature units: ºC or ºF.
Temperature Comp %:
2.00 >
Set the percent change in Conductivity caused by a 1 ºC change in temperature. May be from
0.00 to 10.00.
Loop Adjust
4.00 mA >
Adjust the minimum and maximum current output. Use this setting to match the system output
to any external device. 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
Loop Adjust
20.00 mA >
Test Loop:
>
Press ▲or ▼keys to manually order any output current value from 3.6 mA to 21.00 mA to test
current loop output.
Test Relay 1:
>
Press ▲or ▼keys to manually toggle the state of Relay 1.
Test Relay 2:
>
Press ▲or ▼keys to manually toggle the state of Relay 2.

8 8850-2 Conductivity/Resistivity Transmitter
Calibration Procedure
This instrument has been electronically calibrated at the factory.
• Procedure A verifies the accuracy and linearity of the instrument by simulating temperature and conductivity values with precision
(±0.1%) fixed 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)
13
12
11
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 specified 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 sufficient 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 Verification with Precision Resistors (Electronic Calibration):
1. Simulate the Temperature
The temperature input to the 8850 is a PT-1000 thermistor, where 1000 Ohms (Ω) is equal to 0 ºC and a change of 3.84 Ω
equals a 1 ºC change. (1000 Ω= 0 ºC, 1003.84 Ω= 1.0 ºC, 1007.68 Ω= 2.0 ºC. ... 1096 Ω= 25 ºC)
• Connect a resistor (1000 Ωto 1096 Ω) 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. ( ±0.5 ºC)
2. Simulate the Conductivity
You may calculate the exact Resistance needed to simulate a specific conductivity value , or you may calculate the exact
Conductivity based on a resistor value:
(*1 μS = 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.
Resistance = Cell constant e.g. 0.1 Cell = 5,000 Ωor 5 KΩ
conductivity (Siemens*) 0.000020 (Siemens*)
Conductivity = Sensor cell e.g. 0.1 Cell = 0.000001 Siemens* or 1μS/cm
Simulation resistance (Ω) 100,000 (Ω)

9
8850-2 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 (μS) and the percent of total dissolved
solids (PPM).
Temperature Coefficient
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 significantly 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:
1. Disable the 8850 temperature compensation % factor by entering 0.00.
2. 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 = _______ μS
3. Cool the sample solution close to the minimum process temperature. Place electrode in the sample solution allowing several
minutes for stabilization. Record the displayed temperature and conductivity values.
Displayed temperature: T2 = _______ °C
Displayed conductivity: C2 = _______ μS
(A 10% change in conductivity between steps 2 and 3 is recommended.)
4. Substitute the recorded readings (steps 2 and 3) into the following formula:
TC Slope = 100 × (C1 - C2)
(C2 × (T1 - 25)) - (C1 × (T2 - 25))
Example: A sample solution has a conductivity of 205 μS @ 48 °C. After cooling the solution, the conductivity was measured at
150 μS @ 23 °C (C1 = 205, T1 = 48, C2 = 150, T2 = 23).
The TC is calculated as follows:
5. Enter 1.42 into the Temperature Comp % function in the OPTIONS menu.
TC Slope = 100 × (205 - 150) =5500 = 1.42% / °C
(150 × (48 - 25)) - (205 × (23 - 25)) 3860
Do not use this procedure if the process solution is from 0.055 μS to 0.1 μS (18 MΩto 10 MΩ). An internal pure water
curve is used for these ranges. The factory default setting of 2.00% per °C should be used.
PPM Factor = Solution conductivity (μS/cm)
Total dissolved solids (PPM)
TDS (PPM) = Solution conductivity (μS/cm)
PPM Factor
PPM Factor = 400 μS/cm = 2.00
200 PPM
Example: Solution conductivity = 400 μS/cm, TDS = 200 PPM (mg/L)

10 8850-2 Conductivity/Resistivity Transmitter
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 Ωor greater than 2800 Ω.
• 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
Display Condition Possible Causes Suggested Solutions
"- - - -"
Display is out of range. This may be a normal
condition if your process operates at or near
the limits of the electrode range.
• Check sensor for correct range.
• Check Decimal setting in OPTIONS menu.
• Check Calibrate menu settings for incompatible
SOURCE and RANGE values.
"Value must be
less than 3"
The PPM factor must be a value from
0.00 to 3.00. Set a PPM value less than 3.
Value must be greater than 0 Custom cell constant cannot be set to 0 Set cell constant to a value greater than 0
"Value must be
400 or less" Pulse Rate cannot be greater than 400. Set a pulse rate value less than 400.
Display erratic,
shows "0" or "------"
intermittently
Aux Power not connected. Connect Aux. Power.
See sections 3.1 and 3.2 for wiring information.
"Too much Error
Check Sensor"
• Defective or dirty/coated sensor.
• Wiring error.
• Fluid conductivity too low.
• Defective temp element.
• Clean or replace sensor.
• Check and correct wiring.
• Replace sensor.

11
8850-2 Conductivity/Resistivity Transmitter
Notes

Georg Fischer Signet LLC, 3401 Aerojet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. [phone] • Fax [phone]
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): [phone]
For the most up-to-date information, please refer to our website at www.gfsignet.com
3-8850.090-2 Rev. J 4/12 English © Georg Fischer Signet LLC 2012
Ordering Information
Mfr. Part No Code Description
3-8850-2 159 000 230 Conductivity/Resistivity transmitter Field mount with relays
3-8850-2P 159 000 231 Conductivity/Resistivity transmitter Panel mount with relays
Parts and Accessories
Mfr. Part No Code Description
3-8050 159 000 184 Universal mounting kit
3-8050.395 159 000 186 Splashproof rear cover
3-8050.396 159 000 617 RC Filter kit (for relay use)
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 retrofit adapter
3-5000.598 198 840 225 Surface mount bracket
3-5000.399 198 840 224 5 x 5 inch adapter plate for Signet retrofit
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
Conductivity/Resistivity Electrodes
Mfr. Part No. Code Description
3-2818-1 159 001 718 Conductivity/Resistivity (CR) Cell, 0.01, SS, 3/4 in
3-2819-1 198 844 010 CR Cell, 0.01, SS, 3/4 in reversible threads
3-2819-S1 159 000 085 CR Sanitary, 0.01, SS, 1 to 1 1/2 in.
3-2819-S1C 159 000 087 CR Sanitary, 0.01, SS, 1 to 1 1/2 in., Certified
3-2819-S2 159 000 086 CR Sanitary, 0.01, SS, 2 in.
3-2819-S2C 159 000 088 CR Sanitary, 0.01, SS, 2 in., Certified
3-2819-T1 159 000 081 CR Sanitary, 0.01, Titanium, 1 to 1 1/2 in.
3-2819-T1C 159 000 083 CR Sanitary, 0.01, Titanium, 1 to 1 1/2 in., Certified
3-2819-T2 159 000 082 CR Sanitary, 0.01, Titanium, 2 in.
3-2819-T2C 159 000 084 CR Sanitary, 0.01, Titanium, 2 in., Certified
3-2820-1 198 844 000 Conductivity Cell, 0.1, SS
3-2820-S1 159 000 089 CR Sanitary, 0.1, SS, 1 to 1 1/2 in.
3-2820-S1C 159 000 091 CR Sanitary, 0.1, SS, 1 to 1 1/2 in., Certified
3-2820-S2 159 000 090 CR Sanitary, 0.1, SS, 2 in.
3-2820-S2C 159 000 092 CR Sanitary, 0.1, SS, 2 in., Certified
3-2820-T1 159 000 624 CR Sanitary, 0.1, Titanium, 1 to 1 1/2 in.
3-2820-T2 159 000 625 CR Sanitary, 0.1, Titanium, 2 in.
3-2821-1 198 844 001 Conductivity Cell, 1.0, SS
3-2821-S1 159 000 093 CR Sanitary, 1.0, SS, 1 to 1 1/2 in.
3-2821-S1C 159 000 095 CR Sanitary, 1.0, SS, 1 to 1 1/2 in., Certified
3-2821-S2 159 000 094 CR Sanitary, 1.0, SS, 2 in.
3-2821-S2C 159 000 096 CR Sanitary, 1.0, SS, 2 in., Certified
3-2821-T1 159 000 626 CR Sanitary, 1.0, Titanium, 1 to 1 1/2 in.
3-2821-T2 159 000 627 CR Sanitary, 1.0, Titanium, 2 in.
3-2822-1 198 844 002 Conductivity Cell, 10, SS
3-2823-1 198 844 003 Conductivity Cell, 20, SS
3-2839-1 159 000 921 Conductivity Cell, 0.01, 15 ft cable, NPT
3-2839-1D 159 000 923 Conductivity Cell, 0.01, 15 ft cable, ISO
3-2840-1 159 000 786 Conductivity Cell, 0.1, 15 ft cable, NPT
3-2840-1D 159 000 788 Conductivity Cell, 0.1, 15 ft cable, ISO
3-2841-1 159 000 790 Conductivity Cell, 1.0, 15 ft cable, NPT
3-2841-1D 159 000 792 Conductivity Cell, 1.0, 15 ft cable, ISO
3-2842-1 159 000 794 Conductivity Cell, 10.0, 15 ft cable, NPT
3-2842-1D 159 000 796 Conductivity Cell, 10.0, 15 ft cable, ISO
NOTE: Alternate wetted materials and lengths are available through special order.
Cable length extensions to 100 ft. (30 m) are available through special order.