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Exloc Purge Controls for Pressurization Systems
Solution: applying a source of clean air or inert gas at a positive pressure to an equipment enclosure prevents the ingress of flammable gases and dust. Thus, the hazard classification of the atmosphere inside the enclosure may be reduced. Standards have been established which determine the degree of reduction, and stipulate initial purging volume changes, minimum maintained pressure differential, and system status indication. Alarm initiation and power interruption in the event of pressure loss are mandated for some situations.
System Design Considerations:
|
Type X pressurization reduces the hazard classification from Division 1 to non-classified.
|
|
Type Y pressurization reduces the hazard classification from Division 1 to Division 2.
|
|
Type Z pressurization reduces the hazard classification from Division 2 to non-classified.
|
| Systems for leakage compensation are designed to maintain a minimum positive pressure. |
| Continuous flow systems are for enclosures with internal gas releases, e.g. analysers. |
| Enclosure volume must be checked against the flow capability of the purge control system. |
| A fast purge feature expedites the required number of air changes for system initialization. |
|
Choose
Model |
Type X
|
Type Y
|
Type Z
|
Leakage
Compensation |
Continuous
Flow |
Max. Volume
cu.ft. / m³ |
Initial
Fast Purge |
|
EX300
|
•
|
•
|
2 / 0.057
|
None
|
|||
|
EX301
|
•
|
•
|
•
|
15 / 0.42
|
Manual
|
||
|
EX302
|
•
|
•
|
•
|
75 / 2.12
|
Manual
|
||
|
EX303
|
•
|
•
|
•
|
300 / 8.5
|
Manual
|
||
|
1XLC
|
•
|
•
|
•
|
•
|
60 / 1.7
|
Auto
|
|
|
2XLC
|
•
|
•
|
•
|
•
|
120 / 3.4
|
Auto
|
|
|
3XLC
|
•
|
•
|
•
|
•
|
240 / 6.8
|
Auto
|
|
|
1XCF
|
•
|
•
|
•
|
•
|
17 / 0.48
|
Auto
|
- FM approved for Type Z purging (only)
- Complies with NFPA 496
- Front panel pressure adjustment
- Large easy view pressure indicator
- Stainless steel panel
- Optional pressure switch for alarm
- Optional relief vent for enclosure
- For enclosures up to 2 cu.ft. in volume
- FM approved for both Type Y & Z purging
- Complies with NFPA 496
- Front panel pressure adjustment
- Large easy view pressure indicator
- Fast purge function with separate gauge
- Stainless steel panel
- Optional pressure switch for alarm
- Optional relief vent for enclosure
| EX301 — enclosures up to 15 cu. ft in volume EX302 — enclosures up to 75 cu.ft. in volume EX303 — enclosures up to 300 cu.ft. in volume |
- FM approved for Type X, Y & Z purging
- Provides leakage compensation
- Complies with NFPA 496
- Direct mounting to pressurized enclosure without the need for separate piping
- Automatic fast purge with flow verification
- Status indicators
- Pneumatic logic – independent of electrical power supply
- Stainless steel housing & fittings
- Choice of I.S. contact or pneumatic alarm output
- Optional explosion-proof power contactor
- Includes relief vent valve for enclosure
Valve
| 1XLC — enclosures up to 60 cu. ft in volume 2XLC — enclosures up to 120 cu.ft. in volume 3XLC — enclosures up to 240 cu.ft. in volume |
Contactor
- FM approved for Type X, Y & Z purging
- For continuous flow applications
- Complies with NFPA 496
- Direct mounting to pressurized enclosure without the need for separate piping
- Automatic purge with flow verification
- Status indicators
- Pneumatic logic – independent of electrical power supply
- Stainless steel housing & fittings
- Choice of I.S. contact or pneumatic alarm output
- Optional explosion-proof power contactor
- Includes relief vent valve and calibrated orifice
- For enclosures up to 17 cu.ft in volume
Valve
Contactor
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Exloc Instruments, Inc.
All rights reserved.
Exloc Instruments, Inc.
All rights reserved.