Appendix B – Hydrogen Service Safety System DF-745SG
83
15 Appendix B – Hydrogen Service
Safety System
The
Hydrogen Service Safety System
is designed to safeguard the DF-745SG
from explosion hazards when operating on hydrogen sample gas under normal
pressure and flow conditions as described in this manual. The instrument chassis
and the remote pump, if equipped, are both protected by maintaining a safe
condition within their respective enclosures.
If equipped with this option at the time of shipment from the factory, the analyzer
will be set for Hydrogen operation through the GSF screen and the Hydrogen
Safety Service System will automatically be enabled.
15.1 Instrument
Air circulation fans
pull air in through the front door (and vent through
the rear) of the chassis. The fans are rated at 50 cfm (125 cfm max) which
will maintain the internal chassis space below the lower explosive limit
(LEL)
1
.
Sample delivery interlock valve
blocks flow of sample gas from entering
the instrument chassis under various conditions as described below. It
consists of a normally closed pneumatically actuated UHP springless
diaphragm valve positioned on the sample inlet bulkhead.
Analyzer case purge valve
introduces nitrogen purge flow into the chassis
upon closure of the sample delivery interlock valve. It consists of a
normally open pneumatically actuated valve which feeds a customer
supplied and regulated source of nitrogen purge gas through a bulkhead on
the rear of the cabinet.
2
Instrument controls and logic
3
default, manage and actuate the above
mentioned components to maintain safe operating conditions.
15.2Installation
If equipped with this safety system, the analyzer installation procedure is modified
as follows:
The sample gas inlet connection is made to an interlock valve mounted at
the sample gas inlet on the rear of the analyzer. NOTE: The installation of
this option changes the sample inlet connection to female VCR, from male.
A customer supplied and regulated source of nitrogen purge gas is
connected to both the ¼ inch compression fitting on the case purge valve
Summary of Contents for NanoTrace DF-745SG
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