4-channel input terminal PT100 (RTD) for 3-wire connection KL3214
Run LED
Err LED
CH1...4
Power contact
+24 V
Power contact 0 V
+R1 
RL1 
+R2 
RL2 
+R3 
RL3 
+R4 
RL4 
-R1
-R2
-R3
-R4
Top view 
Contact assembly 
extended shock and vibration range

KL3214 | 4-channel input terminal PT100 (RTD) for 3-wire connection

The KL3214 analog input terminal allows four resistance sensors to be connected directly. The Bus Terminal circuit can operate sensors using the 3-wire technique in a compact 12 mm housing. A microprocessor handles linearisation across the whole temperature range, which is freely selectable. The Bus Terminal’s standard settings are: resolution 0.1 °C. Sensor malfunctions such as broken wires are indicated by error LEDs.

Technical data KL3214
Number of inputs 4
Power supply via the K-bus
Input filter limit frequency typ. 1 kHz
Sensor types PT100/200/500/1000, Ni100/120/1000, potentiometer: 10 Ω…1.2/4 kΩ, KTY sensors (types see documentation)
Connection method 3-wire
Measuring range -200…+850 °C (PT sensors); -60…+250 °C (Ni sensors)
Conversion time approx. 170 ms default setting
Measuring current < 0.5 mA (load-dependent)
Resolution 0.1 °C per digit
Measuring error < ±0.5 °C for PT sensors
Electrical isolation 500 V (K-bus/signal voltage)
Current consumption power contacts
Current consumption K-bus typ. 120 mA
Special features open-circuit recognition
Weight approx. 60 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
Approvals CE, UL