Delta NANOTRACE DF-745 Instruction Manual download pdf (Page 95)

Appendix B – Hydrogen Service Safety System DF-745 91

adequate pump cooling. The purge flow rate is set to 30 scfh as indicated on a

rotometer mounted on the side of the pump enclosure. An in-line flow switch will

trip at a flow rate of less than 26 scfh assuring adequate flow. Loss of purge flow

breaks the contacts in the flow switch, which in turn trips a mercury relay that

removes power to the pump.

 To disable the Hydrogen Safety Service System, use the GSF screen to indicate that

hydrogen is not included in the process gas by entering 0%. See page 49 for

additional information on setting GSF.

CAUTION

The purge flow out of the pump enclosure may contain sample gas

and should be appropriately vented.

CAUTION

After passing through the moisture cell and orifice, the sample is

under vacuum and any leak in the system would result in ingress of

ambient rather than release of sample gas to ambient. Accordingly,

the sample outlet should be vented appropriately to assure adequate

dilution.

CAUTION

The Hydrogen Service Safety System is designed to be safe as

provided by the factory when operating as described in the

Operating Instruction Manual. DO NOT make additional

penetrations in the enclosure. If there is a need to do so, please

contact the factory. Additional penetrations made in the enclosure

(or failure to properly fasten the enclosure door) will allow

additional influx of ambient oxygen and may defeat the case purge

safety mechanism. A pressure relief valve is installed to prevent

over pressurization of the enclosure.

CAUTION

Do not open the pump enclosure door unless AC power is shut off.

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Delta NANOTRACE DF-745 Instruction Manual Page 95