Honeywell SPM, Техническое руководство

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SPM Single Point Monitor
SPM Technical Handbook 5-6
5.2.7 Z-Purge Servicing and Power-up
Procedures
The Model SPM Gas Monitor with Z-Purge requires
that certain procedures be followed when servicing the
instrument (follow Steps 1 to 10) or when the instrument
has lost purge pressure (follow Steps 8 to 10).
Warning
Enclosure shall not be opened unless the area is
known to be non-hazardous or unless all devices
within have been de-energized for at least five
minutes. Verify removal of the power source to
the alarm and fault relay contacts. Following
service, do not restore power to analyzer until it
has been purged for five minutes with instrument
quality air or nitrogen at 28 SCFH (13.2 LPM).
Refer to diagram on page 5-3 for assistance with the
following procedures. Make sure these procedures
are followed when performing any service work to the
instrument.
1. Before beginning service work, take care to
insure that power is removed from all alarm and
fault relay contacts.
2. Turn off main power at the explosion proof switch
(56).
3. Do not open cabinet unless the area is known
to be non-hazardous or unless all devices within
have been de-energized for five minutes.
4. Open purge outlet valve to the horizontal position
(53).
5. All maintenance not requiring power can be
performed at this time.
Warning
Do not restore power unless area is known to be
non-hazardous or unless power has been removed
from all devices within the enclosure for five
minutes.
6. For maintenance/service requiring power, turn
override switch (55) mounted on the front panel
to override position (horizontal). Turn on main
power at explosion proof switch (56).
7. At this point, the purge flow may be turned off via
the purge gas inlet regulator (50) adjustment.
Note:
Upon completion of maintenance/service, the
following steps must be performed:
8. Turn off main power (56), return override switch
(55) to the “on” position (vertical) and close
cabinet.
9. Verify that the purge outlet valve (53) is still
open. Readjust the purge gas inlet regulator
(50) to achieve 28 SCFH (13.2 LPM). Purge at
this rate for a minimum of five minutes to allow
a minimum of four enclosure volumes of purge
gas to flow through unit.
10. To conserve purge gas, adjust purge gas inlet
regulator (50) two turns counterclockwise.
Very slowly close purge outlet valve (53) and
simultaneously adjust purge gas inlet regulator
(50) until purge pressure gauge (54) indicates
0.5-1.0 inches of water column.
11. Turn on main power at explosion proof switch
(56).