LF 298 Conductivity Field Monitor

Overview Specifications Documentation & Tools ;


The WTW Conductivity Field Monitor LF 298 is an economical and flexible solution for use in the field. It comes with galvanically isolated outputs as standard.

Product Features
  • Analog transmitter to directly connect analog conductivity sensors
  • For drinking water sensor LR ML
  • Available as NTC- or Pt1000-version
  • Versatile applications with 7 selectable measuring ranges
  • Connection of different measuring cells possible

User-friendly, analog field monitor - suitable for numerous conductivity measuring cells due to different measuring ranges and cell constants.

Multiple versions:

  • LF 298 NTC - analog transmitter Cond, NTC, 230V (SKU: 391230)
  • LF 298 NTC - analog transmitter Cond, NTC, 24V (SKU: 391231)
  • LF 298 Pt1000 - analog transmitter Cond, PT1000, 230V (SKU: 391234)
  • LF 298 Pt1000 - analog transmitter Cond, PT1000, 24V (SKU: 391235)


LF 298
Order No.
391230, 391234
Measuring Range
0 … 500 mS/cm, different measuring ranges adjustabel
Temperature Measurement
-10 … 130 °C NTC or Pt1000
Temperature Compensation
Automatically via temperature measurement in the sensor or via manual input
2 x switching contacts, change-over, max. 250 VAC / 5 A
Current Outputs
2 x 0(4) … 20 mA
Digital Interface
Modbus / RS485, USB (for configuration, calibration, data recording)
OLED (128 x 64 pixel) with plain text menue
Data Logger
Integrated with real time clock for 4000 datasets, storable via USB, grafical display
Electric Supply
100 … 240 V AC or 18 … 36 V DC
Ambient Conditions
Operational temperature: -10 … 55 °C
Housing Material
Cast Aluminium for wall mounting
Protection Rating
IP 65
2 kg
2 years
The permitted operating voltage of the sensor can vary considerably
Documentation & Tools

Documentation & Tools



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