8-channel input thermocouple EJ3318

EJ3318 | 8-channel input thermocouple

The EJ3318 analog input allows the direct connection of eight thermocouples and is therefore particularly well suited to compact applications on the signal distribution board. The EtherCAT plug-in module's circuit can operate thermocouple sensors using the 2-wire technique. A microprocessor handles linearisation across the whole temperature range, which is freely selectable. The error LEDs indicate a broken wire. The compensation for the cold junction is done by two RTDs (PT1000), which can be placed anywhere on the signal distribution board. The EJ3318 can also be used for mV measurements.

Technical data EJ3318
Technology temperature measurement
Sensor types thermocouples type K, J, L, E, T, N, U, B, R, S, C (default setting type K), mV measurement
Number of inputs 8 x TC, 2 x PT1000 (compensation for the cold junction)
Connection method 2-wire
Measuring range in the range defined in each case for the sensor (default setting: type K; ‑200…+1370 °C);
mV measurement: ±30 mV…±75 mV
Resolution 0.1 °C per digit
Measuring error < ±0.3 % (relative to full scale value)
Input filter limit frequency typ. 1 kHz; depending on sensor length, conversion time, sensor type
Conversion time approx. 5 s up to 40 ms, depending on configuration and filter setting, default: approx. 500 ms
Auxiliary power current
Distributed clocks
Power supply via the E-bus
Wiring fail indication yes
Current consumption E-bus 190 mA
Electrical isolation 500 V (E-bus/field potential)
Special features open-circuit recognition, error recognition of the external cold junction compensation (CJC)
Dimensions (W x H x D) approx. 12 mm x 66 mm x 55 mm
Operating/storage temperature 0…+55 °C/-25…+85 °C
Relative humidity 95 %, no condensation
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Approvals CE