Explosion protection
EXPLOSION PROTECTION
The installation and operation of electrical equip-
ment in potentially explosive atmospheres is subject
to regulations. These regulations refer to the
general rules applicable in technological applica-
tions.
Special fittings
Some chromatographs are provided by us with special
fittings according to customer requirements. The condi-
tions for special fittings are regulated in § 10 of Elex V:
If an electrical unit has been specially manufac-
tured for a particular operation, it must not be
used until the authorized inspector has estab-
lished that it complies with the requirements of
this regulation and has provided a certificate on
the result of this test.
This test can be carried out at the same time as the test
which must be carried out anyway before the chromato-
graph is used for the first time.
WARNING:
The test certificate for your classified chroma-
tograph only applies to the original configura-
tion and to the connection and installation ac-
cording to the Siemens circuit diagrams and
piping diagrams. The classified protection for
your device is cancelled if the configuration or
ignition class of one of more components is
changed.
Following conversions and maintenance on
components relevant to the explosion protec-
tion the chromatograph must be certified
again by an authorized inspector.
Conditions
The conformity certificate with its supplements con-
tains all conditions specified by the authorized inspec-
tor for the installation and operation of the chromato-
graph.
Temperature class
To ensure retention of the temperature class, the heated
components of the chromatograph are protected by
temperature limiters. The temperature limiters must be
reset manually in the event of an error: open the door to
the electronics area and press the corresponding red
button.
WARNING:
An explosion may occur if the electronics door
is opened too soon because of hot components
and residual electrical charges in the chroma-
tograph. An appropriate warning label is
present on the door!
Isolating relay
An isolating relay must be interconnected if signal con-
tacts of the chromatograph supplied by an external
source are used in a division 1 area. These isolating
relays are positioned on the left in the electronics area
(type of protection e) and are switched by the safety
monitoring equipment.
Opening the electronics door
Before opening the electronics door in a division 1 area,
it is essential to switch off the power supply and to then
wait for at least 5 minutes.
WARNING:
An explosion may occur if the electronics door
is opened too soon because of hot components
and residual electrical charges in the chroma-
tograph. An appropriate warning label is
present on the door!
Explosion protection
8
1EXPLO.CHP, Stand Dezember 22, 1999
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