The correct location of gas sensors

March 2001 Sensors & Transducers

For effective gas detection, each installation needs to be considered in its own right, with reference to safety authorities and in compliance with mandatory local safety regulations. The sensor must be operated in accordance with the installation and operating data to maintain safety, reliability and to preserve intrinsic safety integrity where applicable.

It is important that sensors are located in positions determined in consultation with those who have specialised knowledge of the plant of installation and of the principles of gas dispersion. Reference should also be made to those responsible for the engineering layout and topology of the plant as they will be most familiar with the nature of the potential dangers and the most likely sources of gas release.

It is also important to recognise that the characteristics of the gas source can be influenced by many factors, including the relative density or buoyancy of the gas, the pressure at the point of release, the ambient temperature and the ventilation of the site.

Sensor coverage cannot be simply expressed in terms of 'number per unit area'. Sensors need to be sited where they are capable of monitoring those parts of a plant where gas may accumulate or when a source of gas release is expected to occur. This way the earliest possible warning of a gas release can be given to initiate shutdown functions, alarm functions or safe evacuation of the premises.

A comprehensive range of gas monitoring equipment is available from Trolex.

Trolex SA

(011) 397 6958

[email protected]

www.trolex.com

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