Table of Contents
The level of overpressure will be monitored by a pressure sensor or switch located in the enclosure,
at the most difficult point at which to maintain overpressure.
The rate of flow through the enclosure will be monitored by a flow-rate sensor or switch. A pressure gauge is also desirable and should be located where it can be easily read.
When the safe gas is provided from a compressed-air system or cylinders a pressure relief valve should be installed in case of failure of the regulator.
Typical pressurisation monitoring etc.
- Over-pressure monitoring device
- Protective gas flow-rate monitoring Device.
- Pressure gauge
- Pressure relief valve: setting 75% of maximum declared safe over-pressure
Pressurisation Control Systems – marking #
A purge and pressurisation control system with a separate certificate is marked as associated equipment.
- If the control system is for use in the hazardous area, the marking is: Ex [p]
- If the control system is for use in a non-hazardous area, marking is: [Ex p]
