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Hazardous Area Ex ia

Thermocouples and RTD Sensors are an Ignition Source

RTD and Thermocouple sensors are considered to be simple apparatus and when fitted with appropriate barriers may be installed freely in IS Circuits, ( Ex ia ) no further certification is necessary.

However the RTD and Thermocouple Sensors must meet the requirements of; AS/NZS 60079.11: 2006 Explosive Atmospheres Part 11 Equipment Protection by intrinsic safety ’i ’ Section 6.3.12 Dielectric strength requirement “ 500 VAC RMS Test Voltage of Insulation Resistance between Conductors or Conductors and Sheath for 2 minutes “

Thermocouples ( insulated junctions only ) and RTD Sensors manufactured will be subjected to the following tests:

  • Visual and Dimensional Inspection
  • Insulation Resistance Minimum 1000 M Ohms
  • Upscale Polarity Test
  • Electrical Continuity Test
Part No TCTXEXI Transmitter Head Mounted 2 Wire Hart Protocol Ex ia (IECEx Approved)  

Multi Input Thermocouple and RTD
4—20 or 20—4 mA output
Upscale or Downscale Burnout
11.5 to 30 V Power Supply

Data Sheet SD 1836
IECEx Certificate SD 1837

IECEx Certification

Certificate of Test 1047 will be supplied, there are a number of variations depending upon equipment supplied.

All thermocouples and RTD sensors in the price list meeting the requirements can be offered. The sensor will have a label attached .


To compliment these we have available the TCA range of IECEx Approved and in head 2 wire transmitters.

Product Drawings