&#;The BPG Bell Prover test bench is designed to test residential and commercial diaphragm meters from size G1.6 up to G160. These test benches are manufactured using bell prover technology and are suitable to be used in meter manufacturers&#; plants or for laboratory utilities.
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The bell prover standard is a reference standard for air volumes. It is used as a volume reference standard for validating the pre-determined volumes of air needed to perform the calibration of verification of residential and commercial diaphragm gas meters. The test bench generates the requested flow rates and compares the measured volume of the gas meter under test with the applied standard reference system.
A &#;sonic nozzle&#; (also known as &#;Critical Flow Venturi&#; or &#;Critical Flow Nozzle&#;) is a flow meter that can be used as a calibration standard for gas flow meters or any flow measurement device. By design, sonic nozzles are a constant volumetric flow meter.
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The nozzles are designed and manufactured to the ISO standard and as such the gas is accelerated along the Bell Mouth converging section and then is expanded in a conical diverging section, which is designed for pressure recovery.
In the throat, or minimum area point of the Sonic Nozzle, the gas velocity becomes equal to the speed of sound. At this point, gas velocity and density are maximized, and the mass flow rate is now a function of the inlet pressure, inlet temperature, and the type of gas.
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