Leak test of Resistive Plate Chamber gap by monitoring absolute pressure

The differential pressure of a conventional manometer is highly dependent on the atmospheric pressure. The measurements with a manometer for an extended time period show a large variation due to solar atmospheric tides. However, the measurements of absolute pressure, both outside and insideof a resistive plate chamber (RPC), are independent of each other. By monitoring the absolute pressures, both outside and insideof an RPC, along with the temperature, its leakage rate can be estimated. During the test period, the supporting button spacers insidean RPC may get detached due to manufacturing defect. This effect can be detected clearly by observing the sudden fall of pressure insidethe chamber.