Cosa 9610 - Operation of X-Purge and Component Kits

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA 9610™
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21. The X-purge operates by controlling and monitoring compressed instrument air through
the protected enclosure(s) to remove and prevent the accumulation of flammable gas,
vapors, or dust.
The X-Purge system features these main parts:
• Electronic processor (EPCU) housed in an explosion/flameproof enclosure
• I.S. electrical/pneumatic manifold assembly
• Input/output connections and controls for operation
• I.S. user interface for programming and monitoring the system
• 316L stainless steel type 4X IP66 enclosure for EPCU and connections
• Pressure relief vent with flow and pressure monitoring at the exhaust
The user interface allows programming of up to 4 switch inputs, temperature modules,
enclosure power contacts, 2 auxiliary outputs, and various operational functions. Also, the
user interface screen allows monitoring and easy setup of configurable variables. With the
user interface menus, configuration of the standard information for setup and operation of a
system such as purge time, flow rates, pressures, and enclosure size are easily
programmable. Additional features allow Class I and Class II operation, inputs for system
bypass, enclosure power on/off, temperature overload and activation of Rapid Exchange
flow for cooling or auxiliary relay for separate cooling source, delay power shutdown, and
much more. The two auxiliary contact outputs can be configured to activate on most of the
input switches or any of the configured alarm states for pressure, flows, and temperature.
The power for the solenoid valve on the manifold unit, inputs, and EPV-6000 vent are
provided by the EPCU through the internal, galvanically isolated intrinsic barrier. No
additional intrinsic safety barriers are required for annunciation.
The X-Purge provides a complete system for purging and pressurizing enclosures for
hazardous location operation.
The X-Purge system can be set up for Class I/ Division 1 (Zone 1), Class II/Division 1 (Zone
21), or both Class I & Class II/Division 1(Zone 1 & Zone 21) applications in accordance with
the NEC-NFPA 70, NFPA496, ISA 12.4, IEC61241-4, and EN60079-2. This system also
complies with IEC61508, SIL 2 level of integrity with SIL 3 option available.
1.6.2. Operation of X-purge and component kits