Cosa 9610, Инструкция по установке, эксплуатации и обслуживанию

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INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA 9610™
Page 14 of 48
• Alarm Fault – The (red) LED blinks when any alarm input is detected and is solid when
there is an internal system fault.
Pneumatic Manifold with I.S. Solenoid
• Manifold with I.S. solenoid valve: The manifold system is mounted on the 6000 control unit
providing a needle valve to set enclosure pressure and an I.S. solenoid valve that is used for
purging (Rapid Exchange). Power for the I.S. solenoid valve is provided by the EPCU and is
galvanically isolated. Regulated instrument-grade air is required.
• Proportional valve option: The I.S. proportional valve is separated on the 6000 control unit
and provides continuous flow and pressure to the enclosure for purging (Rapid Exchange)
and pressurization. Power for the I.S. solenoid valve is provided by the EPCU and is
galvanically isolated. No needle valve is required. Pressures can be controlled from a user
set-point.
Certifications allow the X-Purge to be used on enclosures in a gas hazardous atmosphere.
Gas atmospheres require the purging of the enclosure. Dust atmospheres require the
physical removal of all the dust that collects inside. Both gas and dust atmospheres require
the following:
1) removing the dust,
2) sealing the enclosure, and then
3) purging the enclosure.
After these sequences, the pressure within the enclosure is above the minimum level. The
equipment within the enclosure can be energized.
Purge Timing
When using the X-Purge in a gas or gas and dust location, the time for purging an enclosure
can be based either on a known purge rate and time (fixed purge time), or based on the
flow rate being measured from the vent (dynamic purge time). Both methods base the time
on the flow measurement at the vent, and complete the process in steps. The EPCU will take
the readings from the vent and use the appropriate reading (listed below) as the useable
flow rate. For example, if the flow rate measurement from the EPV-6000 vent is 7 SCFM, the
EPCU will use 5 SCFM as the flow rate for evaluation. The flow rate measurement steps and
corresponding enclosure pressures are as follows:
• 5 SCFM @ 1.3” w.c. , (141 l/min @ 33 mm w.c.)
• 12 SCFM @ 2.5” w.c., (340 l/min @ 64 mm w.c.)
• 20 SCFM @ 3.1” w.c., (565 l/min @ 77 mm w.c.)
• 30 SCFM @ 3.4” w.c., (850 l/min @ 86 mm w.c.)
The COSA 9610™ uses the first setting of 5 SCFM @ 1.3” w.c. to establish the purge within
the enclosures. This volume exchange and purge timing is factory set to 8mins, but can be
re-configured to a different value if required by the Area Authority having jurisdiction at the
installation site.