LWM-20W Conductance Meter
 

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.

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Technical Data

Power supply 230 VAC +5%/-10%, 50Hz
Power consumption
approx. 15 VA
Fuse protection 4 A mT
Measuring 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
Climatic Conditions acc. to DIN EN 60204-1 ( 05-2010 )
Ambient Temperature -20 ... +55 °C
Housing control panel housing per DIN 43700
with transparent cover up to IP65 in front
of the control panel
Dimensions 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
Download PDF db Data Sheet (german)
  be Description
Ordering information LWM-20W: E1713