LF 298 Conductivity Field Monitor

Overview Specifications Documentation & Tools ;


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

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.

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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