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PO 650 On line pH Meter

Our pH  controller has been designed for easy, affordable installation in tight spaces to perform simple yet effective process control. Thanks to its compact size,the PO-650 controller can be installed on field or Panel.This versatile controller is ideal for a wide variety of applications, such as textiles, papers, photographic solutions, plating baths, chemicals and water treatments.

The PO 650-pH is provided with a selectable set point for acid or alkali dosage. Measurements are directly taken from a pH electrode in the range from 0 to 14 with a 0.01 pH resolution. Accuracy is ensured by two point calibration.  In addition, this model features an optional 4-20 mA analog / RS 485 output.


  • Traceable to national standards
  • Easy settings using front keys
  • On line measurement
  • Unique IP 65 enclosure
  • Auto/Manual option for relay
  • Individual set point based relay operation
  • Programmable control delay
  • Alarm acknowledgement facility
  • Hysterisis to prevent relay chattering
  • ATC facility(Optional)
  • Isolated 4-20mA output optionally available for other applications
  • Communication ready for monitoring / data logging (optionally available)
  • Inbuilt diagnostics for wrong calibration or sensor error