9ENG8008 GFM436 User Manual
Appendix B – Understanding Instruments For Use In Flammable Atmospheres- 80
T6 85 185
The higher the T class the lower the temperature.
Different gases will be ignited at different temperatures. Some examples are given below.
Gas MINIMUM Required T class
Acetylene T2
Hydrogen T1
Ethylene T2
Carbon monoxide T1
Hydrogen sulphide T3
Ammonia T1
Propane T1
Methane T1
17.4 Testing and Certification
This instrument has been submitted for both European Type Assessment, United Kingdom Type Assessment and
IEC Type Assessment. These assessments examine the design and construction criteria set out above and controls
the manufacture process. This process is defined in Annex II of the European ATEX Directive 94/9/EC. This allows the
instrument to carry the ‘Ex’ logo followed by a summary of the level of protection that is incorporated into the
instrument.
NOTE: This instrument is designed to meet the requirements of class T1.
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