Delta Faucet DF-745 Manuel D’Utilisation
90
Appendix B – Hydrogen Service Safety System
The pump enclosure must be mounted to a nearby wall or inside the rack shared by
the analyzer. See Figure 86 on page 94.
the analyzer. See Figure 86 on page 94.
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.
gas inlet on the rear of the analyzer. NOTE: The installation of this option changes
the sample inlet connection to female VCR, from male.
The sample gas outlet is connected by a ¼ inch metal tube from the analyzer sample
outlet, to the needle control valve (supplied loose), and then to the sample inlet on
the pump enclosure.
outlet, to the needle control valve (supplied loose), and then to the sample inlet on
the pump enclosure.
A customer supplied and regulated source of nitrogen purge gas is connected to
both the ¼ inch compression fitting on the case purge valve mounted on the rear of
the analyzer as well as to the 1/8 inch compression purge inlet fitting on the vacuum
pump enclosure.
both the ¼ inch compression fitting on the case purge valve mounted on the rear of
the analyzer as well as to the 1/8 inch compression purge inlet fitting on the vacuum
pump enclosure.
If required, the pump enclosure sample outlet and/or analyzer sample outlet need to
be connected by ¼ inch metal tube and compression fittings to an appropriate
exhaust system.
be connected by ¼ inch metal tube and compression fittings to an appropriate
exhaust system.
The pump power cord is connected from the rear of the analyzer to the pump
enclosure.
enclosure.
15.4 Operation
Before power is applied to the analyzer, the moisture cell is in an isolated state as
the internal inlet and outlet valves are closed. In addition, the external sample
interlock valve is closed and the case purge valve is open allowing customer
supplied and regulated Nitrogen gas to purge the analyzer cabinet.
the internal inlet and outlet valves are closed. In addition, the external sample
interlock valve is closed and the case purge valve is open allowing customer
supplied and regulated Nitrogen gas to purge the analyzer cabinet.
When power is applied, and only after the system has verified proper exhaust fan
operation, the system automatically opens the external sample interlock valve to
enable gas flow and the case purge valve is closed.
operation, the system automatically opens the external sample interlock valve to
enable gas flow and the case purge valve is closed.
NOTE: The back flow prevention screen will be displayed and the user must hit
ESC to acknowledge the screen and remove it.
ESC to acknowledge the screen and remove it.
After approx. 5 minutes, the Warming Up indication will disappear and the user is
then free to open the internal inlet and outlet valves to the moisture cell.
then free to open the internal inlet and outlet valves to the moisture cell.
On analyzer shut-down, or in the event of a power failure or fan failure, the moisture
cell is automatically isolated with internal valves, the external sample interlock valve
closes to block sample flow from entering, and the purge valve opens to allow
Nitrogen purge into the analyzer enclosure.
cell is automatically isolated with internal valves, the external sample interlock valve
closes to block sample flow from entering, and the purge valve opens to allow
Nitrogen purge into the analyzer enclosure.
The pump case purge system continuously feeds a customer regulated supply of
nitrogen into the pump enclosure to (1) maintain the oxygen level well below the
maximum safe level (5% for hydrogen) in the event that the pump diaphragm fails
and leaks sample gas into the enclosure and (2) maintain appropriate flow for
nitrogen into the pump enclosure to (1) maintain the oxygen level well below the
maximum safe level (5% for hydrogen) in the event that the pump diaphragm fails
and leaks sample gas into the enclosure and (2) maintain appropriate flow for