Beckhoff EtherCAT Terminals - ELX3351 | 1-channel analog input terminal strain gauge, 16 bit, Ex i
1-channel analog input terminal strain gauge, 16 bit, Ex i  ELX3351
Self calibration
Error LED
Measure 
Run LED 
Power contact
+24 V EX
Power contact
0 V EX
+UD
+UR
+UV
-UD
-UR
-UV
Top view 
extended temperature range
extended shock and vibration range 25g

ELX3351 | 1-channel analog input terminal strain gauge, 16 bit, 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 UR is determined in 16-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.

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. -20…+20 mV
Measuring range UREF max. -12…+12 V
Internal resistance > 25 kΩ (UR, differential), > 1 MΩ (UD, differential)
Input filter limit frequency typ. 9.5 kHz (-3 dB, low pass)
Conversion time 1.5…800 ms, configurable
Resolution 16 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 12 V DC from power contacts, dependent on sensor
Supply voltage electronics 24 V DC (via power contacts), ELX9560 power supply
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
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 CE, Ex, IECEx
further Ex components  
ELXxxxx EtherCAT Terminals with intrinsic safe in- and output
ELXxxxx-0090 EtherCAT Terminals with intrinsic safe in- and output and TwinSAFE SC
CPXxxxx Multi-touch Panel PCs and multi-touch Control Panels for use in hazardous areas, Zone 2/22