Gauge Pressure Diagram. We will understand the relation between the absolute gauge atmospheric and vacuum pressure by a line diagram. Mcleod gauge comprises a system of glass tubing in which a known volume of gas at unknown pressure is trapped and then isothermally compressed by rising mercury column.
Inexpensive gauges simply have a hole drilled into the inlet connection more expensive gauges have a threaded hole in which can be installed a restrictor orifice. They can range 0 to 15 pounds per square inch psi all the way up to a range of 0 to 1000 psi. I want to make a pressure gauge i have a pressure transducer 0 400 bar pressure range and out put is 05 to 45 volt i want to see the display 0 400 bar in a lcd display.
When an elastic transducer bourdon tube in this case is subjected to a pressure it defects.
Palphafrac1v pv constant p1v1 p2v2 now in this case gas of known volume with unknown pressure is compressed in. Working diagram advantages electricalworkbook. If you are in any doubt about the fitting and electrical connection of this product you must consult a qualified vehicle electrician. We will understand the relation between the absolute gauge atmospheric and vacuum pressure by a line diagram.