Preparation for Installation 35
Housing Purge during Operation
Purge gas flow: max. 20 l/h (constant) at the instrument inlet
Positive pressure of
purging gas:
p
e
= 2 to 4 hPa
With a purge gas flow of 20 l/h at the instrument inlet, the purge gas flow
at the instrument outlet due to leakage will amount to approx. 5…10 l/h.
Housing Purge during Operation when Measuring Flammable Gases
The housing has to be purged with nitrogen. Purge gas flow 1…20 l/h.
The purge gas flow must be monitored at the purging gas outlet.
Housing Purge in the Fidas24
The housing purge is implemented in the Fidas24 gas analyzer in such a
way that a part (approx. 600…700 l/h) of the instrument air is conducted
continuously through the housing as purging air. This ensures that a
flammable mixture cannot form in the housing in the event of a leak in the
combustible gas feed path.
The housing purge is always active if compressed air is switched on,
even if the instrument air valve is closed.
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