ABB EasyLine EL3000, Manual

Page: 6 / 124

6 EL3000 CONTINUOUS GAS ANALYZERS | CI/EL3000-EN REV. C
… 1 Safety
Fidas24 – Information for safe operation
DANGER
Explosion hazard
Explosion hazard due to leaking combustion gas (hydrogen).
• All the information and instructions contained in this
Commissioning Instruction must be complied with
without fail to guarantee 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 tightness 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 commissioning until the internal nominal
pressures have been set.
• The combustion gas feed is switched off if the internal
nominal pressures cannot be set during the ignition
phase (e.g. because of insufficient compressed air or
combustion air feed).
• The combustion gas feed is switched off after several
unsuccessful ignition 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 cannot be allocated to an
(explosion protection-) zone; an explosive gas mixture cannot
escape 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 up-scale 15 Vol.-% CH
4
oder C1 equivalents.
• The relevant safety regulations for working with
combustion gases must be complied with.
• The gas connection diagram (see Gas connections and
electrical connections Fidas24 (model EL3020) on
page 80 and Gas connections and electrical connections
Fidas24 (model EL3040) on page 81) must be complied
with when connecting the combustion gas and
combustion air.
• The combustion gas path in the gas analyzer must not be
opened! The combustion gas path can become leaky as a
result! Escaping combustion gas can cause fires and
explosions, also outside the gas analyzer!
• If the combustion gas path in the gas analyzer has been
opened nonetheless, it must be checked for leakage
(refer to
Check the integrity of combustion gas path on
page 105), using a leak detector (leak rate < 1 × 10
–4
hPa
l/s), once it has been closed again.
• The tightness of the combustion gas supply line (see
Combustion gas line on page 105) outside the gas
analyzer as well as the combustion gas path (see
Combustion gas path in the gas analyzer on page 106) in
the gas analyzer must be checked regularly.
• The maximum pressures of combustion gas and
combustion air (see Operational gases on page 30) may
not be up-scaled.
• The maximum combustion gas flow (see Combustion gas
parameter on page 31) may not be up-scaled.