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KL3311, KL3312 | 1-, 2-channel thermocouple input terminals with open-circuit recognition

The KL3311 and KL3312 analog input terminals allow thermocouples to be connected directly. The Bus Terminal’s circuitry can operate thermocouple sensors using the 2-wire technique. Linearisation over the full temperature range is realised with the aid of a microprocessor. The temperature range can be selected freely. The error LEDs indicate a broken wire. Compensation for the cold junction is made through an internal temperature measurement at the terminals. The KL3311/KL3312 can also be used for mV measurement.


Technical data KL3311 KL3312
Number of inputs 1 2
Power supply via the K-bus
Thermocouple sensor types types J, K, L, B, E, N, R, S, T, U (default setting type K), mV measurement
Connection method 2-wire
Measuring range in the range defined in each case for the sensor (default setting: type K; -100…+1,370 °C); mV measurement: ±30 mV…±120 mV
Resolution 0.1 °C per digit
Conversion time ~ 200 ms ~ 250 ms
Wiring fail indication yes
Measuring error max ±0.5 % (relative to full scale value)
Electrical isolation 500 V (K-bus/signal voltage)
Current consumption power contacts – (no power contacts)
Current consumpt. K-bus typ. 65 mA
Bit width in the process image input: 1 x 16 bit data (1 x 8 bit control/status optional) 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 electrically isolated
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
Approvals CE, UL, Ex



Special terminals  
KL3312-0010 type J
KL3312-0011 type J in Siemens S5 format
KL3312-0012 type L
KL3312-0013 type L in Siemens S5 format
KL3312-0014 type B
KL3312-0015 type B in Siemens S5 format
KL3312-0016 type E
KL3312-0017 type E in Siemens S5 format
KL3312-0018 type N
KL3312-0019 type N in Siemens S5 format
KL3312-0020 type R
KL3312-0021 type R in Siemens S5 format
KL3312-0022 type S
KL3312-0023 type S in Siemens S5 format
KL3312-0024 type T
KL3312-0025 type T in Siemens S5 format
KL3312-0026 type U
KL3312-0027 type U in Siemens S5 format
KL3312-0028 0…120 mV measurement
KL3312-0029 type K in Siemens S5 format
KL3312-0040 expanded temperature range for type S and L type S: -50…+1,700 °C (as supplied type L: -100…+900 °C)
KL3312-0110 type J, Fahrenheit scaling
KL3312-2000 setting of reference junction temperature via process image, unit 1/256° C in a 16 bit word
KL3312-2100 external reference point temperature specification via process image is possible, the unit is 1/256 °C in 16-bit format, fast conversion time 65 ms