• Measuring ranges:
    • 0 to 14 pH
    • 5 to 230°F (-15 to 110°C)
  • Accuracy:
    • ±0.2% of pH range
    • Class B acc to DIN IEC 60751 temperature range
  • ±0.1% of measuring range repeatability
  • IP68 protection
  • ATEX, FM and CSA approvals


The E+H Tophit CPS491D pH sensor is designed for long-term stable pH measurement in fibrous media or media with a high content of suspended solids such as dispersions, precipitation or emulsions. The CPS491D sensor's unbreakable shaft ensures product safety and a long operating life, and the open aperture guarantees reliable measurement under harsh process conditions.

The sensor features Memosens technology allowing for greater process and data safety, easy handling, and predictive maintenance. The non-contact inductive signal transmission eliminates problems associated with moisture, such as corrosion and distortion. The intrinsically safe electronics allow application in hazardous areas. Since measured values are transmitted digitally, data is free from interference and errors are immediately detected. Sensors with Memosens technology have integrated electronics that store calibration data and operating information, allowing for calibration separately from the measuring point and protected from the effects of weather. Maintenance intervals can be defined based on all stored sensor load and calibration data.

E+H Tophit CPS491D pH Sensor Applications

  • Chemical processes
  • Water purification and wastewater
  • Pulp and paper industry
  • Contaminated media and suspended solids
  • Processes with quickly changing pH values or alternating temperatures and pressures