Q45CT Toroidal Conductivity Monitor

ATi’s Q45CT Toroidal Conductivity Transmitter is designed for on-line water quality monitoring of chemically aggressive process solutions.

Key benefits

  • Toroidal sensor immune to fouling
  • Submersion or in-line sensors

Features & specification

  • Measurement from 0-2000 uS to 0-2.000 S
  • Loop-powered or battery-operated
  • External 5-17 VDC version for solar applications
  • Large, easy-to-read LCD display
  • Total Dissolved Solids (TDS) on secondary display
  • Clear, menu-driven user interface
  • NEMA 4X (16-66) enclosure
  • Wall or pipe mounting bracket standard Build-in PID controller


  • Cooling Towers
  • Plating Baths
  • Acid & Base Dilution
  • Salt Water Aquariums
  • Brine Systems
  • Processing Wastewater
  • Streams & Rivers
  • Salt Water Intrusion


Non-contact Conductivity system

ATi’s Q45CT Toroidal Conductivity system is well suited for aggressive chemical processes, water applications that coat or foul traditional sensors and plating bath operations, where high current densities are present.

The sensor consists of two metallic ribbon coils that are fixed in place by the sensor jacket material. The drive coil is used to induce a current in the process solution. The second sensing coil is used to measure the current in the process solution, the magnitude of this current is proportional to the conductivity of the process solution.

The Q45CT is also available as a Concentration Monitor. The conductivity monitor comes with concentration / temperature tables for sodium hydroxide, potassium hydroxide, hydrochloric acid, nitric acid, and sulfuric acid. A user configurable table is also available for entering data points for a custom concentration curve.

Toroidal sensor

Toroidal sensor


Additional information