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Field monitor pH 298

WTW - Field monitor pH 298
WTW - Field monitor pH 298
WTW - Field monitor pH 298

Analog field monitor for the low and high ohms pH measurement - reliable by means of automatic temperature compensation for NTC, Pt100 or Pt1000

  • Low and high ohm pH input to connect also external sensors
  • Reliable measurements by automatic temperature compensation with NTC, Pt100 or Pt1000
  • User-friendly operation by intuitive menu structure

The pH 298 is an economical and metrologically flexible solution for use in the field. Thanks to its integrated lightning protection, the fail rate by secondary lightning effects is minimized. Consequent galvanic separation of all outputs.

The pH 298 is equipped with a low and a high ohm signal input. Thus, the monitor not only can be operated with WTW SensoLyt® measuring probes/electrodes and WTW ProcessLine® electrodes. If the adapted probes are not equipped with an integrated NTC sensor, you can connect any NTC, Pt100/Pt1000 sensors to measure temperature and for automatic temperature compensation.


Model Description Order no.
pH 298 NTC pH/ORP field monitor with 2 current output and MODBUS interface, with automatic temperature compensation (NTC), 230 VAC 191230
pH 298 Pt100 Like the pH 298, but with Pt100 191232
pH 298 Pt1000 Like the pH 298, but with Pt1000 191234

Technical Data

Measuring range 0,0 ... 14 pH, -2000 ... 2000 mV
Temperature measurement NTC, Pt100 or Pt1000 (integrated in sensor)
Temperatur compensation -10 °C ... +130 °C
Analog outputs 2 x 0(4) … 20 mA
2 x Relays
Housing Aluminium housing for wall mounting, protection IP 65
Dimensions 160 x 130 x 70 mm (WxHxD)
Power supply 100 … 240 V AC
or 18 … 36 V DC



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