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LWM-8E Conductance Meter

The LWM-20E is a digital conductance meter with a measurement range of 0 ... 200 mS/cm. It is used in wastewater technologies, water treatment monitoring, desalinization installations, etc.
The complete possible range of indication (for example: up to 99.99 mS/cm at a probe factor of K=1/cm) is captured during measurement. 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 device is equipped with a microprocessor-controlled conductance measurement amplifier, 2 recorder outputs (0)4 ... 20 mA and (0)2 ... 10 V, and two limit value contacts with time delay. A Pt100 input in three-conductor configuration is provided for conductance temperature compensation and for a temperature limit switch. The recorder output can be scaled arbitrary within the whole measuring range (in this way a conductance range of e.g. 15 ... 50 mS/cm can be assigned to the current of 4 ... 20 mA and / or the voltage of 2 ... 10 V).


pdf data sheet (english)

pdf description (english)

pdf data sheet (german)

pdf description (german)

Technical Data

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

Power consumption
approx. 7 VA

Measuring input
0 ... 200 mS/cm
Accuracy: better than 1% of full scale
other ranges and cell constants available on request

Temperature sensor
Pt100 in three-conductor configuration
Temperature compensation
within range of 0 ... 100°C,
temperature measurement from -50°C ... 150°C.
Resolution: 0.5K (rounded internally).

Relay outputs
8, max. 230 VAC, 2A, in 5 neutral groups

Current output
0(4) ... 20 mA, max. load 400 Ohm
Linearity: 0.5% FS
Voltage output
0(2) ... 10 V min. 1 kOhm, Linearity: 0.5% FS

Climatic Conditions
acc. to DIN EN 60204-1 ( 05-2010 )
Ambient Temperature
operation:              -20 ... +55 °C
transport/storage:  -25 ... +55 °C

control panel housing per DIN 43700
with transparent cover up to IP65 in front
of the control panel

W / H / D : 144 x 72 x 125 mm (incl. connector strip)
Mounting cut-out: W x H : 137 x 67 mm
Mounting depth with terminals and plugs
(without cable): min. 126 mm
Ordering information:
LWM-8E: E2021