AIR Gas Detection
3G AIR® and AIR SAFE® are active protection infra-red gas
detection systems for use with mobile/semi-portable equipment,
vehicles and battery powered forklift trucks.
Gas detection by infra-red technology is achieved by the absorption
of infra-red radiation at specific wavelengths as it passes through
a volume of gas. Levels of gas detected by the infra-red sensor are
measured and converted to a 4-20mA signal which is connected to a
control panel. The gas is detected in a range between zero and 100%
LEL (Lower Explosive Limit - the point when the gas mixture in air
becomes explosive).
Infra-red gas detection systems cannot be "poisoned" unlike
pellistor based gas detection systems which are subject to catalyst
poisoning with substances such as silicone. A poisoned pellistor
gas detection system could operate for the rest of a shift without
being able to detect gas. Silicones are commonly found in products
such as chain lubricant.
3G AIR®
For Zone 2 area applications, the 3G AIR® (Advanced infra-Red)
Gas Detection System, a Make Safe solution by preventive means,
primarily by de-energising critical components or equipment,
provides end users with an advanced technological choice over
conventional pellistor based equipment resulting in operational
reliability and maintenance savings.
The 3G AIR® gas detection is fitted alongside other
explosion-protection measures to make the machine compliant to
EN1755:2000.
The 3G AIR® system has a real time LEL display on the front of the
gas detection head and has alarm levels at 10% LEL (visual), 15%
LEL (audible) and 20% LEL (truck de-energised and shut down).
The 3G AIR® gas detection system has been assessed to be compliant
with EN61508-1:2001 safety integrity level SIL1.
The system has a ATEX type examination certificate
(ITS07ATEX15488X).
AIR SAFE®
For increased safety areas, where users need the added assurance
that the area is safe to work, but is not formally classified a
hazardous area.
The AIR SAFE® product also utilises the same proven infra-red
technology as the 3G AIR® system.
AIR SAFE® has a real time LEL display on the front of the control
unit and has alarm levels at 10% LEL (visual), 15% LEL (audible)
and 25% LEL (truck de-energised and shut down).
