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page 195

air flows in

orifice

 

dip tube

air flows to gauge head

height difference proportional to pressure

manometer tube

water tank

• A Differential Back Pressure system uses a split flow channel, one flow goes to the gauge head, the other goes to a zero offset valve. A meter measures the difference in pressures, and thus gives the differences in pressure.

35.6.9 Autocollimators

35.6.10 Level Gauges

35.6.10.1 - Clinometer

35.6.10.2 - The Brookes Level Comparator