Small-Volume Purging/Pressurization Systems are an alternative to NEMA Type 7 or 9 enclosures. The C1 model allows general purpose enclosures, up to two cubic feet, to be used in certain Class 1 hazardous locations. The C2 model allows general purpose enclosures, up to 10 cubic feet, to be used in certain Class 2 hazardous locations.
- Universal mount
- Available in two models for enclosures with a maximum enclosure volume of up to 2 or 10 cubic feet
- Mounting plate: Type 316 brushed stainless steel
- Regulator body: zinc with enamel finish
- Enclosure pressure gauge: aluminum with enamel finish
- Polycarbonate regulator handle
- Fastener hardware available in aluminum and stainless steel
- Includes tamper-proof regulator with gauge (TR-10G) to comply with NFPA standard requiring protection against over pressurization
Note: Pressure Vent not required when inlet pressure limited to 5PSI using standard TR-10G. For inlet pressure over 5PSI order EPV-1-SA-00 or EPV-1-SA-90 separately. Contact Hoffman for pricing.
Enclosures should be constructed from materials such as metal, fiberglass or polycarbonate material to meet or exceed NEMA Type 4, Type 4X or Type 12 performance requirements.
- Classes define the explosive or ignitable substances that are present in the atmosphere.
- Class I Flammable gases or liquid vapors
- Class II Ignitable metal, carbon or organic dusts
- Class III Ignitable fibrous materials
- Groups define substances by rating their explosive or ignitable nature in relation to other known substances.
- Divisions define the degree of hazard by determining an explosive or ignitable substance’s expected concentration in the atmosphere.
- Division 1 Contains substances under normal conditions
- Division 2 Contains substances under abnormal conditions
TYPICAL CLASS I SUBSTANCES:
- Group A Acetylene
- Group B Hydrogen or >30% hydrogen by volume
- Group C Ethyl, ether and ethylene
- Group D Propane
TYPICAL CLASS II SUBSTANCES:
- Group E Aluminum, magnesium and alloys
- Group F Carbon, coke and coal
- Group G Flour, grain, wood, plastic and chemicals
- Division 1 areas must be surrounded by Division 2 areas.
- Class II, Group E areas must be rated as Division 1 areas.