The GasDetek sampling system is ideally suited for commercial kitchens as normal gas detection sensors generally do not last in fast food outlets or any other restaurant environment. There is a lot of hot oil, water and grease in a restaurant environment and this coats the electronic sensors which quickly causes damage and malfunction. It is therefore ideal to have a sampling system with a breathing head consisting of only a mesh filter and junction box which can easily be cleaned with soapy hot water during regular maintenance. The electronics of the GasDetek sampling system is situated away from the breathing head and therefor will not get damaged by the extreme elements around the stoves and fryers.
Sampling systems are more pro-active then point sensors, as they draw the surrounding air back to them, instead of waiting for surrounding air to come to the point sensor.
This solves many problems, the cost of a breathing head is a fraction of a new sensor, if needed to be replaced, or costed for in the beginning. Also, the end user can deal with the problem by cleaning the head which does away with unnecessary, expensive call outs and time wasted/down time.
The sampling/aspirating system uses conduits that are empty, no cables/wires go in the conduit. The ambient air around the breathing head is drawn back to the sensor, which is fitted in a IP65 box on a wall at 1.5m above the floor level, away from the elements that can damage the sensor.
You can have up to 3 breathing heads on a system, either on one conduit or that conduit can split and have 2 heads on one line and one on another line.
The breathing heads will detect up to a couple of meters around the actual head.
The conduit from the breathing head to the panel, must be seamless, in other words have no breaks in it, otherwise it will not sample the air.
The sampling panel will detect hydrocarbons, (LPG, Butane, propane, hydrogen, acetylene).
The sampling panel, has three LEDs,
green for normal, power on or OK,
amber for gas present, this mean that there is gas in the environment
red for solenoid off, which means that the solenoid has shut and the gas has closed.
If you have green then there are no problems
If you have amber and red the user can not reset the panel until the amber light has gone, which means that the gas has dispersed.
If you have only red this means that the danger has passed and the user can reset the panel and open the solenoid valve to allow gas.
If the gas problem has not been dealt with the sampling system will keep activating until the issue has been dealt with.
The sampling system is normally calibrated to detect gas at 20% of the LEL (Lower Explosion Limited). Eg LPG LEL is roughly 2% and the HEL (Higher Explosion Lower) is 10%.
This means that the gas could ignite anywhere between 2 and 10% mixture in air and the sampling system will detect gas at 20% of the 2%.
This 20% LEL can be changed to 40% LEL at the factory if required.
If there is less than 2% then there is too little gas and if there is more than 10% then there is too much gas for an explosion.
The sampling system has an audible and visual warning on the panel.
The sampling unit has an output for either normally closed or normally open that can drive external siren strobe or can be used as a dry contact for an auxiliary system.
There is a fuse holder on the side of the sampling unit, next to the fuse holder is a LED, this should always be on, if this is not on then there is no power going to the panel, and the user must check the power from the plug or DB.
The sampling unit has a battery inside which will keep the panel on for about 1 hour depending on the size of the solenoid valve, as the larger the valve the bigger the draw it will have on the battery if the power if off.