Gas Detection
We offer a range of gas detection systems to choose from dependent on your requirements. From a simple single channel gas detection panel to advanced addressable multi-channel systems with adjustable alarm levels, multi-relay outputs and even combined with gas pressure proving solutions for most requirements.
With detectors for most common gases and options for ATEX, we have it covered.
Gas Type Information
The following information provided is to be considered as general guidance and best practices. If in any doubt, a specific site risk assessment should be performed.
Gases and air interaction
All gases will mix with all other gases over time. They will generally not separate out. Some gases could react chemically with each other on mixing.
Air has an equivalent molecular mass of about 29 and that corresponds to air density at sea level at 15c of 1.225kgm-3. For instance, a gas with a molecular mass lower than 29 will be lighter than air. So a gas or gases mixed with air that is lighter than air will still be lighter than air but less so. They will still tend to rise until they become so diluted (over a given time) with fresh air that the effect will become negligible. The same applies to gases that are heavier than air through with the opposite effect of sinking, see the guide below which will help you.
Temperature effect on gases
Consideration should be given to temperature in so far as a release of a gas is hotter than the surrounding air may initially rise even if the density of the gas is greater than 1.22kgm-3. The converse applies where the release of gas is colder than the surrounding air.
At best, gases, with the exception of oxygen or air, are potentially asphyxiants due to the dilution of Oxygen (O2) in the air. Other gases vary from mild to extreme toxicity.
O2 detectors must never be used to indicate displacement by Carbon Dioxide (CO2) by measuring O2 deficiency.
O2 detectors should never be used to detect toxic gases again by measuring O2 deficiency.
