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LWM-20W Conductance Meter

The LWM-20W is a indicating conductance meter with a measurement range of 0 ... 200 mS/cm. The total possible display range is captured during measurement (e.g., at a probe factor of K=1/cm up to 99.99 mS/cm). In the event the measurement range is exceeded, the unit measures at reduced resolution and precision. Cable capacities up to 50 nF may be masked by means of a special measuring procedure. The unit contains a microprocessor-controlled conductance measurement amplifier, one recorder output (0)4 ... 20 mA, and two limit value contacts with time delay. A PT-100 input in three-conductor configuration is provided for conductance temperature compensation and for a temperature limit switch. The recorder output can be freely scaled within the entire measurement range (for example, a conductance range of 15 ... 50 mS/cm can be associated to current from 4 ... 20 mA). This unit is used in wastewater technologies, water treatment monitoring, desalinization installations, etc.

Technical Data

Power supply
230 VAC +5%/-10%, 50Hz

Power consumption
approx. 15 VA

Fuse protection
4 A mT

Measurement input
0 ... 200 mS/cm – accuracy: better than 1% from final value / other ranges and cell constants available on request

Temperature sensor
PT100 in three-conductor configuration
Temperature compensation
in range from 0...100°C,
temperature measurement from -50°C ... 150°C.
Resolution: 0.5K (rounded internally).

Relay outputs
8 x neutral, max. 230 V AC, 2 A

Current output
0(4)...20 mA, max. load 400 Ohm
Linearity: 0.5% FS

Ambient temperature
-20 ... +55 °C

Housing
DIN plastic housing for wall mount - IP54

Dimensions
W / H / D : 243 x 193 x 116 mm

Ordering information:
LWM-20W: E1713



pdf data sheet (german)

pdf description (german)

pdf description (english)