4-channel analog input terminal RTD, 2-wire connection, 16 bit, Ex i ELX3204
Error LED 4
Error LED 3
Error LED 2
Error LED 1
Run LED 
Power contact
+24 V EX
Power contact
0 V EX
+R1
+R2
+R3
+R4
-R1
-R2
-R3
-R4
Top view 
extended temperature range

ELX3204 | 4-channel analog input terminal RTD, 2-wire connection, 16 bit, Ex i

ExThe ELX3204 analog input terminal allows the direct connection of RTDs located in hazardous areas classified Zone 0/20 or 1/21. The circuitry of the ELX3204 can operate sensors with 2-wire technology. Linearisation is carried out over the entire freely selectable temperature range. By default the terminal is set to PT100 sensors with 2-wire technology. The ELX3204 terminal indicates signal state and sensor malfunctions (e.g. wire breakage) by means of LEDs.

Technical data ELX3204
Number of inputs 4 (differential)
Power supply via the E-bus
Connection method 2-wire
Temperature range -200…+850 °C (PT sensors); -60…+250 °C (Ni sensors), for further types and details see documentation
Resolution 0.1 °C per digit
Measuring current < 1 mA (depending on sensor and measuring range)
Measuring error < ±0.3 % (relative to full scale value)
Internal resistance typ. ≥ 10 kΩ (differential)
Input filter limit frequency typ. 1 kHz
Sensor types PT100, PT200, PT500, PT1000, Ni100, Ni120, Ni1000 resistance measurement (10 Ω…4 kΩ), KT(Y) sensors
Conversion time 10…3300 ms (adjustable, default: 270 ms)
Supply voltage electronics 24 V DC (via power contacts), ELX9560 power supply
Current consumption power contacts typ. 10 mA
Current consumption E-bus typ. 70 mA
Special features limit value monitoring, digital filter and characteristic curve linearisation integrated, connection method freely configurable
Weight approx. 60 g
Operating/storage temperature -25…+60 °C/-40…+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/see documentation
Approvals/markings CE, UL, ATEX, IECEx, cFMus
Ex-Marking ATEX:
  II 3(1)G Ex ec [ia Ga] IIC T4 Gc
  II (1)D [Ex ia Da] IIIC
  I (M1) [Ex ia Ma] I
IECEx:
  Ex ec [ia Ga] IIC T4 Gc
  [Ex ia Da] IIIC
  [Ex ia Ma] I
cFMus:
  AIS Class I, II, III, Division 1, Groups A thru G
  Class I, Division 2, Groups A, B, C, D
  Class I, Zone 2, AEx nA [ia Ga] IIC T4 Gc
  Class I, Zone 2, AEx ec [ia Ga] IIC T4 Gc
  [AEx ia Da] IIIC T4
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