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    Updated: 10 May 2020



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Hydrochloric acid, HCl
Hydrochloric acid is a colourless, corrosive gas with a pungent odour.

Hydrochloric acid is soluble in water and the solution is called hydrochloric acid, this may be important to think about when the leaking gas can result in corrosive concentrations of hydrochloric acid, if it comes into contact with water.

HCL is obtained as a byproduct in the chemical industry and used in particular in the semiconductor industry.

Hydrochloric acid is highly irritating to the eyes and mucous membranes.

Odour threshold limit value is about 5 ppm.

If the concentration increases up to about 100 ppm it may give rise to very serious pain.

Very high concentrations are associated with mortal danger.

Important to note is that the fact that symptoms may arise much later.

Persons who have been exposed to HCl
should see their doctor immediately.

Threshold limit value for max. gas concentration is 5 ppm

Alarm limit should be set at the upper limit value.

Because the gas is readily absorbed by materials in the pipelines etc., the use of aspiratory systems may be problematic.

Sensor Placement
Hydrochloric acid is slightly heavier than air which means that the detectors should in most cases be placed low, since the gas will sink to the floor.

In some cases, however, you cannot trust this fact.

Explosion Risk
Hydrochloric acid can, together with certain other substances to cause explosions.

Examples of such substances are ammonia, ethylene oxide, and others.



IP 65, Wall design


IP65, Duct design












ATEX Gas detectors are available for 2 explosion classes as follows:

Zone 1 is available with or without display.

Gas detectors for ATEX Zone 1 are located in a flameproof enclosure, EEx d

The shell is such that ignition and combustion within the shell of a potential explosive gas mixture is not propagated to the explosive mixture outside the enclosure and the enclosure can thus endure the resulting explosion pressure without damage.

In Zone 1, one can expect an explosive atmosphere to occur during normal operation but the presence of it is relatively short.

The equipment shall not be a source of ignition in normal operation or when an error occurs.

Gas detectors for ATEX Zone 2 are of the design Non-sparking EEx nA

EEx nA is a non-sparking piece equipment.

In Zone 2, you need not count with an explosive atmosphere to occur during normal operation, and if it should occur, which is probably rare it is of short duration.

The equipment shall not be a source of ignition during normal operation.







E-mail: lars@fjellcom.se     

Phone: +46(0)31-287202

Mobile: +46(0)706-755561



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