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KL3351, KS3351 | 1-channel resistor bridge terminal (strain gauge)


The KL3351 analog input terminal permits direct connection of a resistor bridge. The bridge voltage, UD, and the supply voltage, UREF, to the bridge are digitised with a 16 bit resolution, and are transmitted along an electrically isolated channel to the supervising automation system. The input channels are available in the form of two 16 bit values for further processing. The resulting measurement can be calculated from the formula: measurement = UD/UREF. Precise acquisition of the supply voltage along with the bridge voltage compensates for long-term and temperature drift.


Technical data  
Number of inputs 2, for 1 resistor bridge
Power supply via the K-bus
Signal voltage UD -16…+16 mV, configurable
Signal voltage UREF -10…+10 V, configurable
Technology DMS connection
Internal resistance min 200 kΩ (UREF), min 1 MΩ (UD)
Power supply UV 5 V DC, max. 20 mA
Resolution 16 bits
Conversion time max 250 ms, configurable
Filter 50 Hz, configurable
Measuring error max ±0.1 % (relative to full scale value)
Current consumption power contacts – (no power contacts)
Current consumpt. K-bus typ. 65 mA
Bit width in the process image input: 2 x 16 bit data (2 x 8 bit control/status optional)
Special features with internal bridge supply
Weight approx. 70 g
Operating/storage temperature 0…+55 °C/-25…+85 °C
Relative humidity 95 %, no condensation
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27/29
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Pluggable wiring for all KSxxxx Bus Terminals
Approvals CE, UL, Ex



Special terminals  
KL3351-0001 1-channel resistor bridge terminal (strain gauge), with faster measurement time approx. 10 ms