2-channel input terminal PT100 (RTD) for 4-wire connection, high-precision KL3222
Error LED2
Run LED1
Error LED1 
Run LED1 
Power contact
+24 V
Power contact 0 V
+R1
+RL1
-R1
-RL1
+R2
+RL2
-R2
-RL2
Top view 
Contact assembly 
extended shock and vibration range

KL3222 | 2-channel input terminal PT100 (RTD) for 4-wire connection, high-precision

The KL3222 analog input terminal allows resistance sensors to be connected directly. Linearisation over the full temperature range is realised with the aid of a microprocessor. The temperature range can be selected freely. The Bus Terminal's standard settings are: resolution 0.01 °C in the temperature range of PT100 sensors in 4-wire connection. The run LEDs give an indication of the data exchange with the Bus Coupler. The error LEDs indicate sensor faults (e.g. a broken wire).

Technical data KL3222 | KS3222
Number of inputs 2
Power supply via the K-bus
Technology 4-wire
Sensor types PT100, PT200, PT500, PT1000, Ni100, Ni120, Ni1000 resistance measurement (e.g. potentiometer, 10 Ω…1.2/5 kΩ), KTY
Connection method 4-wire
Measuring range -200…+850 °C (PT sensors); -60…+250 °C (Ni sensors); -200…+320 °C (high-precision)
Conversion time typ. 50 ms
Measuring current typ. 0.5 mA
Resolution 0.01 °C per digit
Measuring error 0.1 °C at 40 °C ambient temperature, 4-wire connection, PT100 sensors and 50 Hz filter
Electrical isolation 500 V (K-bus/signal voltage)
Current consumption power contacts
Current consumpt. K-bus typ. 60 mA
Bit width in the process image input: 2 x 16 bit data (2 x 8 bit control/status optional)
Configuration no address setting, configuration via Bus Coupler or controller
Special features open-circuit recognition, high-precision
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
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
Product announcement
KL3222: available
KS3222: estimated market release on request