What are the parts of a gas test gauge?
What are the parts of a gas test gauge? |
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Gas test gauge scale and zero adjuster |
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The scale of a gas test gauge is graduated in millibars (mbar). The smallest value that can be read on the scale is 0.5 mbar.
The zero adjuster allows the user to slide the scale upwards or downwards to calibrate the gas test gauge. It is essential that the instrument is zeroed correctly to ensure that it provides accurate readings. For more information, see . |
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Gas test gauge U-tube |
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The u-tube of the gauge contains either water or manometer fluid (for more information, see the section on manometer fluid below).
As the pressure increases and acts upon the fluid in the tube, the reading given by the gas test gauge changes. One end of the u-tube is open to the atmosphere, whilst the other is connected to a gas appliance or vessel. |
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Gas test gauge test hose |
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A hose is used to connect the gas test gauge to the gas appliance being tested.
For measuring the pressure of natural gas, an ordinary rubber hose is used. However, to measure the pressure of Liquefied Petroleum Gas (LPG), a nitrile hose is required. Not all manufacturers supply a hose with their gas test gauges; you may have to buy a hose separately. |
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Gas test gauge hanging tab |
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The hanging tab enables the user to hang the gauge vertically, for example, on a wall hook. | |||
Gas test gauge protective case |
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Most gas test gauges are supplied with a plastic case to protect the instrument when not in use.
The case can be secured onto the base and used as a stand to support the tool vertically while pressure measurements are taken. |
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Manometer fluid |
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Although most users fill the u-tube of their gauge with water, alternatively, they could use manometer fluid.
Manometer fluid is a coloured indicating liquid that helps the user to clearly read pressure measurements from the scale of the gas test gauge. |
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