Q45P/R pH & ORP Transmitter

ATi’s Q45P/R pH & ORP Transmitters provide the combination of reliability, durability, accuracy, and versatility required for pH and ORP monitoring applications.

Features & specification

  • Differential sensors for long life
  • Loop-powered or battery-operated
  • External 5-17 VDC version for solar power applications
  • Submersion, In-line, or sanitary-style sensors
  • Special High Purity sensor option
  • Adapts to Conventional pH or ORP 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


Continuous water quality monitoring of pH & ORP

The versatile Q45P/R system monitors Potential of Hydrogen (pH) and Oxidation Reduction Potential (ORP). Measurement and control of pH is important in a wide variety of industries. Water and wastewater, boiler feed water, food processing wash water, chemical plant make-up water and many other aqueous system require reliable pH monitoring. The pH Transmitter provides the combination of durability, accuracy, and versatility required for virtually any pH monitoring application. The ORP Transmitter provides the same reliable monitoring system for Oxidation-Reduction Potential (ORP) applications.

Q45 pH and ORP Transmitters use “differential” type sensors designed for long life in the most demanding applications. Differential sensors are well suited for applications that quickly poison conventional pH or ORP sensors, and can be easily serviced by operators. A variety of sensor styles are available to meet almost any application.

Differential sensors

Differential sensors

Conventional sensor

Conventional sensor

Key benefits

  • Durable, accurate, and versatile for virtually any pH monitoring application
  • Uses differential-type sensors for long life
  • Easily serviced by operators


The Q45P pH/ORP Monitor is available for a wide range of applications including:

  • Cooling Towers
  • Plating Baths
  • Potable Water Treatment
  • Metals Precipitation
  • Wastewater Treatment
  • Streams & Rivers
  • Chemical Process Control
  • Boiler Feedwater


Additional information