4-channel input terminal, thermocouple, high-precision, electrically isolated EL3314-0002
Error LED 4
Error LED 3
Error LED 2
Error LED 1
Run LED 
+TC1
+TC2
+TC3
+TC4
-TC1
-TC2
-TC3
-TC4
Top view 
Contact assembly 

EL3314-0002 | 4-channel input terminal, thermocouple, high-precision, electrically isolated

The EL3314-0002 analog input terminal allows the direct 2-wire connection of four thermocouples. The channels are electrically isolated from one another and from the E-bus, thus preventing interference and damage due to cross-currents. Various types of thermocouple are supported; the voltage is calculated in temperature directly in the terminal. The terminal can also be used for mV measurements. A broken wire is signalled by the error LEDs and on the fieldbus. Cold junction compensation takes place by means of precise internal temperature measurement at the connecting terminals, but operation with an external cold junction is also possible.

Technical data EL3314-0002
Number of inputs 4
Power supply via the E-bus
Thermocouple sensor types types K, J, L, E, T, N, U, B, R, S, C (default setting type K), mV measurement
Distributed clocks
Input filter limit frequency typ. 1 kHz; depending on sensor length, conversion time, sensor type
Connection method 2-wire
Resolution 24 bit, presentation adjustable: 0.1/0.01/0.001 °C per digit or 10 nV per digit
Wiring fail indication yes
Conversion time approx. 1.2 s up to 20 ms, depending on configuration and filter setting, default: approx. 100 ms
Voltage measurement ±78 mV (error: ±25 µV)
Temperature range in the range defined in each case for the sensor (default setting: type K; -200…+1370 °C); voltage measurement: ±78 mV in 10 nV resolution
Measuring error @ 50 Hz filter, @ 25 °C ambient temperature:
type B: ±5.0 °C; type E: ±1.8 °C; type J: ±1.8 °C; type K: ±1.8 °C; type L: ±1.8 °C; type N: ±2.5 °C; type R: ±4.0 °C; type S: ±4.0 °C; type T: ±1.8 °C; type U: ±1.8 °C; type C: ±3.5 °C
Electrical isolation 2500 V functional isolation (test voltage channel/channel and channel/fieldbus, production test)
Current consumption power contacts
Current consumption E-bus typ. 200 mA
Special features open-circuit recognition, simultaneous measurement of the channels
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
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