Delta NANOTRACE DF-745 Instruction Manual download pdf (Page 96)

92 Appendix B – Hydrogen Service Safety System

CAUTION

The operator is obligated to assure proper operation of the analyzer

air flow system as designed. Do not impede air flow at the inlet in

the front door or at the exhaust fan outlets on either side of the

cabinet in the rear.

NOTES

For hydrogen, which has a lower explosive limit (LEL) of 4%, the maximum allowable

influx in event of an internal leak would be 120 scfh, whereas the normal flow as defined in

the Operating Instruction Manual is about 1/10

that at approximately 14 scfh.

Use of the analyzer case purge is at the customer’s discretion. It most likely is not

necessary since in the event of sample delivery interlock, the sample feed is blocked from

entering the chassis and the only open flow path through the system is dissipation of

remaining sample in the bypass, which would be vented externally, or in the event of an

internal leak, would be volumetrically insignificant.

The pneumatic control for the sample interlock and case purge valves is provided by an

internal 12 VDC solenoid.

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Delta NANOTRACE DF-745 Instruction Manual Page 96