Compex - Temperature Rating

Question 1

What is meant by compex temperature rating?

Answer 1

Temperature class (T-rating) for gases/vapors

Definition: The maximum external surface temperature the equipment can reach under fault/normal conditions.

Purpose: It must be lower than the auto-ignition temperature of the gas present so it can’t ignite it.

Question 2

What are the temperature ratings?

Answer 2

• T1: 450°C (worst)
• T2: 300°C
• T3: 200°C
• T4: 135°C
• T5: 100°C
• T6: 85°C (best)

Question 3

What is ambient temperature rating in compex?

Answer 3

Ambient temperature rating (Ta)

• Marked as a range (e.g., Ta −20°C to +55°C).
• The equipment is certified to operate safely only within this ambient range; outside it, surface temperature behavior can change.
• If no range is shown, many standards assume a default of −20°C to +40°C, but always check the nameplate/documentation.