Q46P/R pH & ORP Monitor

ATi’s Q46P/R pH & ORP water quality monitor provides the durability, accuracy and versatility required for pH and ORP monitoring or control applications.

Key benefits

  • Differential or conventional pH sensors available
  • Automatic buffer recognition simplifies calibration
  • Q-Blast sensor cleaning option available
  • Multiple sensor mounting options


Continuous water quality monitoring of pH & ORP

The versatile Q46P/R system monitors 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 including sulfide, cyanide, chlorine and bisulfite.

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.

The addition of ATi’s Q-Blast option provides the ideal answer for automatic pH or ORP sensor cleaning. Employing a unique ‘air-blast’ cleaning method, sensors can be cleaned as often as necessary without operator attention.

Q-Blast AutoClean
differential sensors

Features & specification

  • Choice of either “differential” or “conventional” pH sensors.
  • Auto-Cleaning
  • Automatic buffer recognition simplifies calibration.
  • Power options include universal 100-240 VAC or 12-24 VDC.
  • Two isolated 4-20 mA outputs are standard, with an option for a third output if required. Default setting provides analog outputs for pH/ORP and temperature.
  • Standard PID control function assignable to one analog output.
  • Available for either Profibus-DP, Modbus-RTU, or Ethernet-IP.
  • Three SPDT relays are standard, with relay functions programmable for alarm, control, or trouble indication. Three additional low power relays available as an option.
  • NEMA 4X (IP-66) enclosure is suitable for wall, pipe, or panel mounting.
  • Back-lit large LCD display provides clear visibility in any lighting conditions. A scrolling second line on the display provides additional information and programming prompts.


The Q46P pH/ORP Monitor is available for a wide range of applications including:

  • Water and wastewater
  • Boiler feed water
  • High purity water
  • Food processing wash water
  • Chemical plant cooling water
  • Many other aqueous systems that require reliable pH monitoring

Additional information