Q45C4 4E Conductivity Transmitter

Q45C4 4E Conductivity Water Quality Transmitter is the solution for almost any water-based process monitoring.

Key benefits

  • Reliable conductivity measurement with self-checking sensor
  • Monitoring for almost any water based process
  • Multiple sensor mounting configurations

Features & specification

  • Measurement from 0-200 uS to 0-2.000 S.
  • Loop-powered or battery-operated
  • External 5-17 VDC version for solar applications
  • 4-Electrode sensor design for fouling compensation
  • Titanium electrodes for corrosion resistance
  • Submersion, In-line, or Sanitary sensors
  • Large, easy-to-read LCD display
  • Clear, menu-driven user interface
  • NEMA 4X (IP-66) enclosure
  • Wall or pipe mounting bracket standard
  • Built-in PID controller


  • Cooling Towers
  • Plating Baths
  • Potable Water
  • Streams & Water
  • Chemical Processing
  • Fish Farms
  • Wastewater
  • Salt Water Intrusion


Reliable conductivity measurement, with self-checking sensors

ATi’s 4-Electrode Conductivity Transmitter is the answer for water quality monitoring almost any water-based process. Drinking water, plating bath solutions, cooling water, process wash water, or virtually any other aqueous system can be monitored accurately and reliably. The unique drive/control scheme used in the 4-Electrode System allows a single sensor configuration to be used in conductivity ranges from 0-200 μS to as high as 0-2,000 mS (0-2 S).

ATi’s Q45C4 4-Electrode Conductivity Transmitter’s “auto-ranging” feature enables the monitor to display the actual conductivity value during “overshoot” conditions. For chemical mixing applications, a concentration display can be selected for a limited number of acids and bases. If your application involves very low conductivity/resistivity measurement, ATi can provide the Q45C2 system that is used in process waters with conductivities below 20 μS.

Sanitary sensor

Sanitary sensor

convertible sensor

convertible sensor

insertion sensor

insertion sensor


Additional information