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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
FOR YOUR SAFETY 1
1.3 Scope of application
1.3.1 Principal application limitations
● Do not use GMS840 and GMS842 to measure combustible gases when no additional
safety precautions have been taken (see Info box).
● Do not use GMS840 in potentially explosive atmospheres.
● Only use GMS841 (ATEX/IECEx) and/or GMS842 (cCSA
US
) in the Ex zones stated on the
type plate.
● GMS841 is not intended for measurement of combustible gases.
● Do not use GMS840, GMS841 and GMS842 to measure explosive gas mixtures.
1.4 Main safety information
Only for GMS841 (ATEX/ IECEx)
Dangerous sample gases
In hazardous situations
▸ Actuate the emergency-stop switch or switch the main switch of the host system off.
1.5 Additional documentation/information
This document supplements the Operating Instructions “GMS800 Series”. It extends these
Operating Instructions with technical information on the Enclosures GMS84x.
▸ Observe the Operating Instructions delivered with the “GMS800 Series”.
▸ If these Operating Instructions are not available in your language: Pay attention to the
delivered safety information document (in 24 official EU languages). This safety
information document is a summary of the safety information and warnings of the
GMS800 series and of the enclosure variants.
If the sample gas is combustible or can create a flammable gas mixture with air, there
can be a risk of explosions when a defect causes a leak in internal gas paths. Therefore,
applications with combustible sample gas require additional safety precautions (e.g.
permanent enclosure purging with a protective gas, warning devices).
WARNING: Risk of explosions in potentially explosive atmospheres
▸ Do not open the enclosure when an explosive atmosphere is present.
▸ If the enclosure has been opened: Check the enclosure for leak tightness before
restarting (page 22).
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 during transport and mounting
▸ Do not transport the device in potentially explosive atmospheres.
▸ Do not carry out work on the device in potentially explosive atmospheres.
▸ Only use tools approved for Ex zones.
WARNING: Risk of explosion due to combustible gases
▸ Do not use the enclosure GMS84x to measure combustible gases when no
additional safety precautions have been taken.
The “GMS800 Series” Operating Instructions also specify all further documents
belonging to the individual device.
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