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	< ±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