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pH/ORP Monitor

Wide range of sensor for all applications

ATI Model Q45P/R

The versatile system helps monitor Potential of Hydrogen (pH) and Oxidation Reduction Potential (ORP). The differential pH/ORP sensors make use of a sealed reference system – a second glass pH electrode – to help prevent the destruction of the sensor (from chemical poisons such as sulfide, cyanide, chlorine, bisulfite, etc.)

How it works:

Within the sensor, the integral preamplifier creates a low impedance signal output. This helps to provide consistent readings in all environments, maximising the distance between sensor and analyser.

Features and Benefits:

  • The system is designed for use in all industrial and municipal applications
  • The sensors are engineered to function normally in applications (the more conventional sensors quickly fail)
  • There are a number of diagnostics in place to alarm the user in the event of electrode breakage, loss of sensor seal integrity, or integral temperature sensor failure.

Technical Specifications of Sensor:

  • Measuring Range: 0 to 14 pH, -1000 to +2000 mV
  • Sensitivity: 0.002 pH; 0.2 mV
  • Stability: 0.02 pH; 2 mV (per 24 hours, non-cumulative)
  • Temperature Range: -5 to 95°C (23 to 203ºF)


  • Sensitivity: 0.05% of span
  • Stability: 0.05% of span per 24 hours
  • Sensor Types: Q-Series pH or ORP with  preamp, 5-wire input; combination-style pH or ORP  with temperature compensation
  • Temperature Drift: Span or zero, 0.02% of span/ºC

Please download the technical documentation for further details.

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