Cosa 9610, Инструкция по установке, эксплуатации и обслуживанию

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INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA 9610™
Page 12 of 48
1.6 X-Purge option.
The COSA 9610A™ Calorimeter is protected by a Pepperl & Fuchs X-purge unit:
The purge Type X, EEx ‘px’ purge pressurization system protects general-purpose equipment
mounted in a standard enclosure so that it can be located and operated in a hazardous area.
The hazardous area classification can be Class I and/or Class II, Division 1/Zone 1 and/or
Zone 21. The X-purge operates by controlling and monitoring compressed instrument air or
inert gas 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
• Intrinsically safe 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 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.
The X-Purge consists of the control unit and user interface mounted in a 316L stainless steel
Type 4X (IP66) enclosure with the pneumatic solenoid valve mounted on the unit. A
proportional valve can be ordered in place of the solenoid valve for continuous control of
flow and pressure to the enclosure.