• 3-8900
  • Usually ships in 2-3 weeks. Call for expedite options



  • Multi-language display
  • 1/4 DIN enclosure
  • Up to 4 analog outputs
  • Up to 8 relays
  • 12 to 24 VDC or 85 to 264 VAC Power
  • Digital Communication for extended cable lengths & easy wiring
  • Accepts 4-20mA output with use of 8058 Signal Converter
  • Available with 4 or 6 channels
  • Two BTU calculations


The GF Signet 8900 multi-parameter controller takes the concept of modularity to the extreme. Each GF Signet 8900 multi-parameter controller is field commissioned with the user's specified combination of inputs, outputs, and relays using simple-to-install modular boards into the base unit.

The GF Signet 8900 multi-parameter controller includes a back-lit LCD display. Available with a selection of plug-in modules for either four or six input channels which accept any of the GF Signet sensors listed below, and/or other manufacturer's sensors via a 4 to 20mA signal converter (GF Signet i-Go 8058 Signal Converter).

To complete your GF Signet 8900 multi-parameter controller, choose a power module with universal AC line voltage or 12 to 24 VDC. If more features are needed, analog output and relay modules are available and easily installed. Plus, the GF Signet 8900 multi-parameter controller will support up to four additional relays via an external relay module.

There are other notable features that the GF Signet 8900 multi-parameter controller offers. For instance, digital input to the GF Signet 8900 multi-parameter controller enables longer cable runs and simplified wiring with minimal noise interference. Advanced relay logic provides operators an "and / or" logic to produce high / low alarms. Derived measurements include difference, sum, ratio, percent recovery, percent rejection, and percent passage - and now with BTU.

Applications for the GF Signet 8900 Multi-Parameter Controller

  • RO/DI System Control
  • Media Filtration
  • Pure Water Production
  • Demineralizers
  • Chemical Processing
  • Metal & Plastics Finishing
  • Fume Scrubbers
  • Proportional Chemical Addition
  • Cooling Tower & Boiler Protection
  • Wastewater Treatment
  • Aquatic Animal Life Support Systems
  • Rinse Tank

System Compatibility

The GF Signet 8900 multi-parameter controller is compatible with a wide variety of GF Signet components. Please click here to view typical system configurations. If you have any questions about your particular installation, please contact us.


Required Components

These additional components are required for the operation of your product. We strongly advise you to purchase these components unless you already own them or own a suitable alternative.

Power Supplies

Mounting Bracket


Please consider these optional accessories.