AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 15
Fidas24: Information on the safe operation of the gas analyzer
CAUTION
The gas analyzer uses hydrogen as a combustion gas!
All the information and instructions contained in this operating instruc-
tion must be complied with without fail to ensure safe operation of the
gas analyzer!
Measures of the manufacturer
The following measures ensure that the enrichment of combustion gas or an
explosive mixture of combustion gas and ambient air cannot occur inside
the gas analyzer during normal operation:
• The seal integrity of the combustion gas feed path is checked for a
leakage rate of < 1 × 10
−4
hPa l/s before delivery.
• The combustion gas/air mixture (before and after the ignition point) is
diluted in the detector with compressed air.
• The combustion gas feed is not connected to the supply during start-up
until the internal nominal pressures have been set.
• The combustion gas feed is switched off if the internal nominal pres-
sures cannot be set during the ignition phase (e.g. because of insuffi-
cient compressed air or combustion air feed).
• The combustion gas feed is switched off after several unsuccessful igni-
tion attempts.
• If the flame goes out during operation the combustion gas feed is
switched off if the following ignition attempts are unsuccessful.
The interior of the gas analyzer is not assigned to an (explosion protection)
zone; no explosive gas mixture can escape from it to the outside.
Conditions to be complied with by the end user
The end user must comply with the following prerequisites and conditions
to ensure safe operation of the gas analyzer:
• The gas analyzer may be used for the measurement of flammable gases
provided that the flammable portion does not exceed the following limit
values:
Fidas24: 15 vol.% CH
4
or C1 equivalents,
Fidas24 NMHC: 5 vol.% CH
4
or C1 equivalents.
• The relevant safety regulations for working with flammable gases must
be complied with.
• The gas connection diagram (see page 83) must be complied with when
connecting the combustion gas and combustion air.
• The combustion gas feed path in the gas analyzer may not be opened!
The combustion gas feed path can become leaky as a result! Escaping
combustion gas can cause fires and explosions, also outside the gas an-
alyzer!
• If the combustion gas feed path in the gas analyzer has been opened,
however, it must always be checked for seal integrity (see page 285)
with a leak detector after it has been sealed again (leakage rate
< 1 × 10
−4
hPa l/s).
• The seal integrity of the combustion gas line (see page 283) outside the
gas analyzer and the combustion gas feed path (see page 285) in the gas
analyzer must be checked on a regular basis.
• The maximum pressures of combustion gas and combustion air (see
page 48) may not be exceeded.
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