11
8018429/1DWP/V3-0/2022-06| SICK
A D D E N D U M T O O P E R A T I N G I N S T R U C T I O N S | GMS840
Subject to change without notice
PRODUCT DESCRIPTION
2
2.3
Opening the enclosure cover
2.3.1
Safety measures before opening the enclosure
Only open the enclosure in a dry, dust-free room.
For GMS841 (ATEX/ IECEx) and GMS842 (
C
CSA
US)
:
CAUTION: Risk of burns on hot components
Hot components are marked with a label (see left).
▸
Do not touch hot components
WARNING: Health risks/accident risks
If
– the GMS84x measures toxic, dangerous or combustible gases
– the GMS84x is in a potentially explosive atmosphere
– it is suspected that the internal gas paths have a leak
then carry out the following measures before opening the enclosure:
1
Interrupt every gas feed to the GMS84x apart from the purge gas feed (when
present).
2
Switch the power supply to the GMS84x off at an external source.
3
In potentially explosive atmospheres (only GMS841 (ATEX/ IECEx) and GMS842
(
C
CSA
US)
): Disconnect the GMS84x from all external voltages (e.g. signal lines).
Exception: Connections to intrinsically safe power circuits can remain connected.
4
If enclosure purging is installed: Wait for an appropriate time so that the enclosure is
purged with inert gas.
5
If necessary, take protective measures against escaping gases (e.g. breathing
protection, suctioning off).
▸
Some components are hot: Before touching components: Observe the cooling time.
▸
Only open the enclosure when it is safe to do so.
WARNING: Risk of injury through contact with toxic sample gas
Accumulated sample gas can escape when the enclosure is opened. Depending on the
quantity and composition of the gas, this can cause serious injuries when the
respiratory system and the skin have direct contact with the gas.
▸
Always switch the device off before opening the enclosure.
▸
Perform all steps of the shutdown procedure,
see “Shutdown procedure”, page 25
.
▸
Wear the specified protective clothing.
WARNING: Risk of explosion when the enclosure is opened incorrectly
▸
Do not open the enclosure when an explosive atmosphere is present.
WARNING: Possibility of explosive gas in the enclosure
The enclosure is not gas-tight.
This means: Explosive gas can accumulate in the enclosure when used in Ex zones.
▸
Be aware that after use in Ex zones, explosive gas can still be in the enclosure
outside of the Ex zone.
WARNING: Risk of explosion when the grounding cable to the enclosure cover
is defective
▸
When the grounding cable has been put under traction during opening of the
enclosure cover or the cover has been dropped: Check the grounding cable for
damage and replace if necessary.
