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Transmitter LKM 231

DIN rail transmitter LKM 231 for thermocouples with output signal 4...20mA, with galvanic isolation

 

The LKM 231 is an analog transmitter for various thermocouples according to DIN EN 60584 and DIN EN 43710. It converts the temperature-dependent thermoelectric voltage of the sensors into a standard signal of 4...20mA. The temperature compensation of the reference junction is done in the transmitter itself. It has a galvanic isolation between input and output. The transmitter is delivered from the factory calibrated to customer specifications. Depending on the measuring range and thermocouple type, the calibration is carried out in such a way that the occurring temperature errors are minimized. A voltage-linear adjustment for further processing of the measured values in the PC or PLC can also be carried out. This should be specified when ordering. A span and zero controller allows subsequent fine adjustment. The supply can be made from a voltage source.

 

* depends on thermocouple

Output

4 ... 20mA

Sensor fracture

>20 mA

Auxiliary supply

24V DC ±10%, reverse protection

Reaction time

< 0.1s

Error of compensation

<±0.5°C

Terminal type

screw terminal

Current consumtion

max. 40 mA

Case

EMG25-LG

Case material

Polycarbonat

Weight

approx. 60g

Input

Thermocouples K, J (L), T (U), N, E

S and B with higher fault

Range

> 200 °C*

Zero point

-200 °C ... +600 °C*

Loop voltage

10...35VDC, reverse protection

Shorted Sensor

room ambient temperature

Vibration

5g/10-200Hz

Linearity error

<0.1% FS*

TCR

< 100 ppm/°C

Permissible ripple

< 10 %

Operating temperature range

-25 °C ... +85 °C

Clamping range

0.2...2.5mm²

Humidity

< 95%

EMC emission

EN 61000-6-3:2001

EMC interference rejection ratio

EN 61000-6-3:2001

Mounting

35mm DIN rail

Case dimension (HxWxD)

75 x 25 x 53 mm

Insulation voltage

1 kV