Transmitter

Our transmitters provide scalable measurement and control solutions, from single-parameter monitoring to multiparameter automation. With easy sensor integration and sturdy design, they deliver the precision, flexibility, and reliability your processes require.

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Turning Sensor Data into Process Intelligence

GF transmitters transform sensor signals into powerful process intelligence. Engineered for precision, reliability, and seamless integration, they deliver real-time data that drives confident control and smarter automation.

Trusted across water treatment, chemical processing, industrial utilities, and dosing applications, they measure flow, pH/ORP, conductivity/resistivity, salinity, temperature, pressure, level, dissolved oxygen, and 4–20 mA inputs. Optimizing your performance and elevating your process excellence starts here.

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Key Industries
Success Stories

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Precision Measurement Solutions for Pinpoint Accuracy

From single-parameter control to advanced multiparameter automation, the 9900 and 9950 Transmitters deliver scalable performance for demanding process applications. The 9900 offers flexible, modular single-channel measurement, while the 9950 consolidates up to six sensors into one powerful platform with advanced logic and control functions—helping you optimize panel space, simplify integration, and enhance operational efficiency.

Multi-Channel, Multi-Parameter Transmitter

9950

The 9950 combines the easy setup of a transmitter with the versatility of a controller. Compact yet powerful, the 9950 transmitter offers up to six user-configurable channels. With six channels, you can save real estate on your panel by purchasing a single controller in a ¼ DIN package. Sensors connected to the 9950 can be wired in a daisy chain configuration to save on wiring costs as well.

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Single-Channel, Multi or Single-Parameter Transmitter

9900

9900 Transmitters are versatile, single-channel controllers available in single- or multi-parameter versions, designed to deliver reliable performance across a wide range of applications. They provide clear “at-a-glance” visibility, intuitive operation, and simple setup. With flexible compatibility, they support Flow, pH/ORP, Conductivity/Resistivity, Salinity, Temperature, Pressure, Level, Dissolved Oxygen, and 4–20 mA sensors.

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Flexible module integration

Expanded capabilities

Expand the performance of your 9900 and 9950 transmitters with a comprehensive range of plug-in modules. From Direct Conductivity/Resistivity and 4–20 mA outputs to Relay, Batch, H COMM, and Modbus RTU communication, these modules enhance flexibility, connectivity, and control—allowing you to tailor each transmitter to your exact process requirements.

9950 Series

Discover all available modules for the 9950 Transmitter

9900 Series

Discover all available modules for the 9900 Transmitter

Single-Channel Direct Conductivity/Resistivity Module

Allows direct connection to single conductivity/resistivity sensor up to 30m (100 ft) in cable
For applications separated by more than 30m (100 ft) use 3-2850-51-XX Sensor Electronics

Dual-Channel Direct Conductivity/Resistivity Module

Allows direct connection to two conductivity/resistivity sensors up to 30m (100 ft) in cable
For applications separated by more than 30m (100 ft) use 3-2850-51-XX Sensor Electronics

Modbus RTU Module

Connects the 9950 to existing Modbus RTU, serial RS485, and automation networks

Allows digital access to live measurement readings
Simplifies the interfacing of the 9950 to automation networks

Relay Module

Three options:

4 dry-contact relays
2 dry-contact and 2 solid state relays
2 dry-contact and 4 binary inputs

H COMM Module

Allows communication between the 9900 Transmitter and a HART®-enabled device
Allows access to primary and secondary measurements remotely
Allows user to remotely adjust the 4 and 20 mA settings
Not compatible with Batch module

4-20 mA Module

Adds a second 4-20 mA output
Output can be used for primary or secondary measurement

Direct Conductivity/Resistivity Module

Allows direct connection to the conductivity/resistivity sensor up to 30m (100 ft) in cable
For applications separated by more than 30m (100 ft) use 3-2850-51-XX Sensor Electronics

Batch Module

Adds batch control capability to the 9900 Transmitter

Compatible with all GF S3L and frequency output flow sensors
Up to 10 batch sizes can be stored in one 9900 with customized names and K-factors available for each batch

Modbus RTU Module

Ability to transfer live readings, units of measure, and measurement status

Connects to PLCs and SCADA systems
Supports the serial Modbus RS-485 standard

Relay Module

Adds two programmable dry-contact relays

Hysteresis and time delay available for each relay
Depending on the sensor type, there are a total of 23 relay modes available

Key Industries

Across critical industries, accurate measurement is the foundation of safe and efficient process control. GF transmitters convert sensor signals into reliable, real-time data that enables precise monitoring and automation. Designed for demanding environments, they support a wide range of parameters and applications and empower operators to maintain compliance, optimize performance, and ensure long-term system reliability.

Water Industry

In the water industry, precise measurement and control are essential to ensure safety, efficiency, and regulatory compliance. GF transmitters provide reliable monitoring of flow, pH/ORP, conductivity, level, and other critical parameters across drinking water, desalination, and wastewater treatment. With robust design and seamless sensor integration, they enable stable operations and long-term performance in demanding environments.

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Chemical Process Industry

In chemical processing, accuracy and responsiveness are vital to protect processes and assets. GF transmitters deliver real-time insight into key parameters such as flow, pressure, pH/ORP, conductivity, and temperature. Built to perform in aggressive and corrosive conditions, they support consistent dosing, safe chemical handling, and optimized process control.

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Success Stories

Scymaris - Liquid Analysis

Ecotoxicology specialist Scymaris relies on various analytical sensors, such as conductivity or dissolved oxygen (DO), and the 9950 Six-Channel Transmitter by GF Industry and Infrastructure Flow Solutions, for failsafe environmental fate studies.

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Neustark - Carbon Capture Removal

Due to the harsh environment in the reactor, Neustark chose to implement solutions for Process Automation from GF Industry and Infrastructure Flow Solutions, consisting of conductivity and flow sensors, pH electrodes, as well as the 9950 Six-Channel Transmitter.

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Sofitel Quiberon - Water Treatment

As part of a network consisting of 120 resorts and hotels around the world, the Sofitel in Quiberon offers visitors a luxurious experience of the picturesque peninsula located in Brittany, France. In order to reliably manage the flow of seawater, Sofitel has implemented transmitters, flow meters as well as the Butterfly Valve 565 by GF.

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Want More Stories?

Have a look at our reference case collection and learn how GF Industry and Infrastructure Flow Solutions has helped our customers improve water quality and ensure operational safety.

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As a global company, we’re committed to supporting you, no matter where you or your customers are. Our regional centers provide repair and support services, while our team of experts specializes in tailoring customized solutions for your unique application.

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Planning fundamentals: Industry

The Planning Fundamentals for Industry contain the entire expertise on industrial piping systems of GF Industry and Infrastructure Flow Solutions and are divided into three books: "Design and Installation", "Valves and Actuators" and "Measurement and Control". Download them here.