Starting at $1,232.00

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  • 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.

Power Supplies

GF Signet 7310 Switching Power Supplies
Regulated output voltage in compact and lightweight plastic housings for DIN Rail mounting

Mounting Bracket

GF Signet Accessory Kit
Wall Mount Accessory for 9900


Please consider these optional accessories.

GF Signet 8059 External Relay Modules
Supplement the output capabilities of host instruments with digital S3L output
GF Signet 2759 pH/ORP System Tester
Battery-powered millivolt generator simulates pH values for trouble-shooting and system verification
GF Signet i-Go 8058 Signal Converter
Converts 4-20mA signal into the Signet digital format (S3L) for use with GF Signet instruments
GF Signet 200 Retrofit Adapter
1/4-DIN retrofit adapter
GF Signet Heavy Duty Wall Mount Bracket
Heavy duty 1/4 DIN wall mount bracket (panel mount only)
GF Signet Surface Mounting Bracket
GF Signet Installation Fittings
Fittings for securing insertion style flow sensors with different styles, models & materials to suit a variety of applications
In Stock
GF Signet 2756-WT and 2757-WT pH / ORP Electrodes
Wet-tap pH and ORP electrodes featuring DryLoc connector with gold-plated contacts
$439.00 to $510.00
$395.10 to $459.00
Part Number Price Available
Show Configuration
Base Price
Number of Inputs
Power Supply
12 to 24 VDC
Number/Type of Relays
Number/Type of Outputs
2 passive 4-20mA (requires external power source) (+$168.00)
$1,400.00 2

Interested in Other Part Numbers?

Other part numbers are available to order but are not currently in stock. Current availability for non-stock parts is "Usually ships in 2-3 weeks. Call for expedite options". Click here to select options