Georg Fischer 9950 Specifications

Signet 9950 Single or Dual Channel Direct Conductivity/Resistivity Module
Signet 9950 Dual Channel 4 to 20 mA Current Loop Output Module
Signet 9950 Modbus Module

*3-9950.092*

3-9950.092 Rev. 2 02/19 English

Instruction Sheet

Description

The 9950 Transmitter o󰀨ers the following module options. 3-9950.394-1 is a Single Channel Direct Conductivity/
Resistivity Module, 3-9950.394-2 Dual Channel Direct Conductivity Module, 3-9950.395-M Modbus Module, and

a 3-9950.398-2 Dual Channel 4 to 20 mA Current Loop Output Module.

The plug-in modules may be installed either before
or after the base unit is installed in the customer’s
application.

• Always disconnect power from the 9950 Before
adding or Removing any modules.

• Modules can be installed in either slot.

• Refer to 9950 Manual for set up and programming.

Module Installation

1. Remove power from the 9950. Carefully align pins
and connectors (do not bend connecting pins) and

push module rmly into place.

English

9950

MODULE 1

Rounded

MODULE 2

Shown with Single Channel
Conductivity Module installed in Module Slot 2

Corners

Dual Channel
4 to 20 mA Module

Important!

Ensure the rounded
corner of the module is
alligned with the rounded
corner of the module slot
before installing

Module Removal

1. Ensure power is disconnected from the 9950.

2. Unplug connectors and squeeze the two retaining
tabs while pulling module out of 9950.

CAUTION:

Exercise care when installing or removing module.
Do not bend connecting pins.

Avoid Electrostatic Discharge (ESD):

● Minimize handling of module to reduce the

possibility of damage due to ESD.

● Handle module by the edges. Never touch

any exposed circuitry or contacts.

● Wear an anti-static wristband or stand

on an anti-static mat, or keep one hand
touching a properly grounded pipe or other
properly grounded piece of metal when
handling module.

Conductivity Module Wiring

Dual Channel

Conductivity Module

Shield

Black

White

Red

ISO GND

TEMP

SHLD

SIGNAL

shield

Black

White

Red

ISO GND

TEMP

SHLD

SIGNAL

3-9950.394-1

Single Channel Cond.

SHIELD (silver)
TEMP (white)
ISO GND (black)

SIGNAL (red)

Shield

Black

White

Red

ISO GND

TEMP

SHLD

SIGNAL

Single Channel

Conductivity Module

Dual Channel

Dual Channel

Conductivity Module

Modbus Module

Shield

Black

White

Red

ISO GND

TEMP

SHLD

SIGNAL

shield

Black

White

Red

ISO GND

TEMP

SHLD

SIGNAL

(Optional) Shield

Brown

Yellow

RS485

RCVR

PLC

–

+

3-9950.394-1, 3-9950.394-2
Direct Conductivity Resistivity Module

Compatible with all GF Signet Conductivity Electrodes. Maximum Conductivity cable length is 30 meters (100 feet).
For longer distances use the 3-2850 Conductivity Sensor Electronics. Up to two modules can be installed in a 9950 Transmitter.

Single Channel

Conductivity Module

Shield

SHLD

White

Black

Red

TEMP

ISO GND

SIGNAL

SHIELD (silver)
TEMP (white)
ISO GND (black)

SIGNAL (red)

3-9950.394-1

Single Channel Cond.

Loop Wiring

3-9950.398-2

Dual Channel 4 to 20 mA Module

Two additional 4 to 20 mA passive current loop outputs

in a single module, allows up to six current loop modules
in the 9950 Transmitter.

PLC

or

Recorder

–

Modbus Module Wiring

3-9950.395-M

Modbus Module

Connects the 9950 to serial, RS485, Modbus automation networks.

Ordering Information

+

PLC

or

Recorder

–

Dual Channel

Conductivity Module

Shield

SHLD

White

TEMP

Black

ISO GND

Red

SIGNAL

shield

SHLD

White

TEMP

Black

ISO GND

Red

SIGNAL

4 to 20 mA Module

Power

Supply

+

–

+

Loop A+

Loop A–

Loop B+

Loop B–

Loop A +
Loop A ­Loop B +
Loop B -

3-9950.398-2

Dual Channel 4-20mA

Modbus Module

RS485

RCVR

PLC

+
–

Shield recomended in
noisy environment

(Optional) Shield

Yellow

Brown

Mfr. Part No. Code Description

3-9950.394-1 159 001 846 Single Channel Direct Conductivity/Resistivity Module

3-9950.394-2 159 001 847 Dual Channel Direct Conductivity/Resistivity Module

3-9950.398-2 159 001 848 Dual Channel 4 to 20 mA Current Loop Output Module

3-9950.395-M 159 001 905 Modbus Module

Georg Fischer Signet LLC, 3401 Aero Jet 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

3-9950.092 Rev. 2 02/19 English © Georg Fischer Signet LLC 2019