1-channel analog input terminal strain gauge, Ex i  ELX3351
Self calibration
Error LED
Run LED 
Power contact
+24 V EX
Power contact
0 V EX
Top view 
extended temperature range

ELX3351 | 1-channel analog input terminal strain gauge, Ex i

ExThe analog ELX3351 input terminal enables direct connection of a resistor bridge or load cell from hazardous areas, Zone 0/20 and 1/21. The terminal can be connected in 4- or 6-wire technology. The ratio between the bridge voltage UD and the supply voltage UREF is determined in 24-bit resolution, and the load value is calculated as a process value. Apart from automatic self-calibration (can be deactivated), additional functions such as Tara and Freeze as well as dynamic filters are integrated. The ELX3351 is therefore functionally comparable to the EL3356.

Technical data ELX3351
Technology resistor bridge, strain gauge
Sensor types resistor bridge, strain gauge
Number of inputs 1, for 1 resistor bridge in full bridge technology
Bridge input resistance 300 Ω…1.5 kΩ
Measuring range UD max. -18…+18 mV
Measuring range UREF max. -12…+12 V
Internal resistance > 25 kΩ (UR, differential), > 1 MΩ (UD, differential)
Input filter limit frequency typ. 3.6 kHz (-3 dB, low pass)
Conversion time typ. 1.6 ms
Resolution 24 bit, 32 bit presentation
Filter 50 Hz, configurable
Measuring error < ±0.5 % (relative to full scale value), self-calibration activ
Power supply UV up to 10 V DC from power contacts, dependent on sensor
Supply voltage electronics via E-bus
Current consumption power contacts depends on sensor, min. 20 mA
Current consumption E-bus typ. 85 mA
Supported nominal sensitivity all, parameter resolution: 0.01 µV/V; recommended: 0.5…3 mV/V
Special features self-calibration, dynamic filters, Freeze
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
  Ex ec [ia Ga] IIC T4 Gc
  [Ex ia Da] IIIC
  [Ex ia Ma] I
  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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CPXxxxx Multi-touch Panel PCs and multi-touch Control Panels for use in hazardous areas, Zone 2/22