26
11041781.04 01/2020 EN/DE
Pressure gauge with reed contact model 851-A, for Ex areas
EN
Inductive load with AC voltage
With AC voltage two protection measures are possible:
5.4 Commissioning
Pressure surges must be avoided at all costs, open the shut-off
valves slowly.
6. Faults
DANGER!
Danger to life from explosion
Through working in flammable atmospheres, there is a
risk of explosion which can cause death.
▶
Only rectify faults in non-flammable atmospheres!
Example:
Contact protection
measure with voltage-de-
pendent resistor VDR
VDR
Contact
Load
Example:
Contact protection
measure with RC element
Contact
Load
5. Commissioning ... / 6. Faults
