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A sample of gas is drawn into the sample chamber using the hand pump. Any combustibles land on the surface of the hot wire and burn increaseing the temperature of the wire thereby increaseing the resistance. This causes an imbalance in the wheatstone bridge arrangment indicated on the display. This display is scaled in percent lower explosive limit and is calibrated for hydrocarbons. Note that the unit will operate against any combustible gas although the readout would be erroneous.
calibration gas is used to check the accuracy of the meter. In addition the unit must be landed on a regular basis for formal calibration.
I am the author of marineengineering.org.uk which most of the work on your website has been copied against which you are making financial gain. If you do not gain permission or remove it I will take further action. My site is non-commercial, I note you have placed content from marinediesels.info which is a commercial site, you are in breach of his copyright and as such ne may not be as generous in allowing you time to remove his work before taking further action.
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