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Sensors and Electrodes

2850 Conductivity/Resistivity Sensor Electronics

2850 Conductivity/Resistivity Sensor

Data Sheet
User's Manual

The Signet 2850 Conductivity/Resistivity Sensor Electronics are available in various configurations for maximum installation flexibility. The universal mount version is for pipe, wall, or tank mounting and enables single or dual (digital output only) inputs using any standard Signet conductivity / resistivity sensor. The threaded j-box version can be used with these same Signet sensors for submersible sensor mounting. It is also available as a combined integral system configuration for in-line mounting and includes a conductivity electrode in a choice of 0.01, 0.1, 1.0, 10.0, or 20.0 cm-1 cell constants. The 2850 is ideal for applications with a conductivity range of 0.055 to 400,000 µS or a resistivity range of 100 Megohms to 10kohms.

All 2850 units are available with a choice of two outputs, digital (S3L) or 4 to 20 mA. The digital (S3L) output version allows for up to six sensor inputs directly into the Signet 8900 Multi-Parameter Controller. The two-wire 4 to 20 mA output is available with eight 4 to 20 mA output ranges for each electrode cell constant.

All 2850 units are built with NEMA 4X/IP 65 enclosures which allow wiring connections with long cable runs of up to 1,000 feet (305 m). EasyCal is a standard feature that automatically recognizes conductivity test solution values for simple field calibration. A calibration tool is available to validate of the sensor electronics according to USP requirements.


  • Integral mount systems for quick and easy installation
  • Compact design for maximum installation flexibility
  • Digital (S3L) interface or two-wire 4 to 20mA output
  • EasyCal with automatic test solution recognition
  • Dual channel unit available for low cost installation with Signet 8900 Multi-Parameter Controller
  • For use with ALL Signet conductivity electrodes
  • Water Treatment and Water Quality Monitoring
  • Reverse Osmosis
  • Deionization
  • Demineralizer, Regeneration & Rinse
  • Scrubber, Cooling tower and Boiler Protection
  • Aquatic Animal Life Support Systems

2819-2823 Conductivity/Resistivity Electrodes

2819-2823 Conductivity/Resistivity Electrodes

Data Sheet
User's Manual

Signet Conductivity/Resistivity Electrodes are designed to provide versatile installation and accurate sensing across a very broad dynamic range. Coupled with Signet-patented measuring circuitry a three decade range with ±2% of reading accuracy is achieved without the need for troublesome sensor platinization. Platinum RTD (PT-1000) properly located within the sensor allows optimal temperature sensing. Standard wiring allows connection without costly "patch cords".


  • Controlled surface finish ensures accuracy and repeatability
  • Flow-through design
  • In-line or submersible mounting
  • Certified cells ±2% meets USP requirements
  • Standard process connections
    - 3/4" NPT Polypro
    - Tri-clamp 1 -11/2", 2"
    - Opt. 1/2" NPT 316 SS
  • 316 SS Standard Electrode
  • Alternate materials
    - Titanium
    - Hastelloy-C
    - Monel
  • PTFE insulator


  • Pure Water Treatment
    - Reverse Osmosis
    - De-ionization
    - Distillation
  • Boiler Condensate
  • Semiconductor Water Production
  • Rinse water monitoring and control
  • Chemical Concentrations
  • Cleaner and Degreaser Concentrations
  • TDS
  • Salinity
  • USP Purified Water and WFI Water Production

2839-2842 NPT Conductivity/Resistivity Electrodes

2839-2842 Conductivity/Resistivity Electrodes

Data Sheet
User's Manual

The 2839-2842 Conductivity/ Resistivity Electrodes are available in four cell constants from 0.01 to 10.0, and are suitable for a wide variety of applications from high purity water quality monitoring to demineralizer regeneration. 316SS electrode surface finishes are controlled in a precision bead blasting operation to ensure measurement accuracy and repeatability. The PEEK insulator and process connections are injection over-molded to minimize variance between electrodes. Double threaded connections in either 3/4 in. NPT or ISO 7/1-R 3/4 enable quick and easy installation in submersible or in-line configurations. Transmitter integral mounting kit and J-Boxes are available as accessories.


  • Controlled surface finish ensures accuracy and repeatability
  • 316SS electrodes with injection molded PEEK process connections and insulators
  • Compact electrode length for easy in-line installation
  • Suitable for operation up to 131°C (268°F)
  • 3/4 in. NPT or ISO 7/1 - R 3/4 process connections
  • Double-threaded connection for in-line or submersible mount
  • Triple orifice flow-through design reduces clogging and bubble entrapment
  • Cell constants may be traceable to NIST and certified to within ±1% of value
  • Integral Mounting Kit and J-Box acccessories


  • Water Treatment & Water Quality Monitoring
  • Reverse Osmosis
  • Deionization
  • Cooling Tower
  • Boiler Protection
  • Distillation/Desalination
  • Demineralizer
  • Semiconductor
  • Aquatic Animal Life Support Systems

Conductivity/Resistivity Tools

C/R ToolsC?R Tools 2

Data Sheet

The Signet conductivity/resistivity tools are available for calibration ovalidation of electronics that are independent of the electrode. Because there are no available liquid standards for calibration in low conductivity and resistivity applications, these tools are ideal for various installations. All tools are built to conform to the ASTM D 1125-95 Standard (Standard Test Methods for Electrical Conductivity and Resistivity of Water), which is also commonly used for USP 24 applications.

Signet tools simulate, within ±0.1% precision (accuracy), various values: 1.0 µS, 2.5 µS, 10.0 µS, 10.0 MO, 18.2 MO. These tools are also temperature compensated to 25°C and enable the user to accurately validate or calibrate the electronics.

Model 2830 can be used with Signet Models 5800CR, 8850, and 8860 instruments. The 2850-101-X simulators are used with the newly released Model 2850 electronics and simply plug into the same terminals as the sensor cables.


  • Simulates five different values
  • Compatible with all Signet Conductivity/Resistivity instruments
  • Verifies electronics independent of electrode
  • NIST traceable units
  • Temperature compensated to 25°C
  • All units ship with NIST traceable certificates

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Updated on April 3rd 2019

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