When to Use Bell-Prover Gas Meter Test Bench？

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.

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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.

The BELL prover automatic test stand is designed to test diaphragm and ultrasonic meters referenced to a Bell. All calibration and setup data is stored on the provers computer for easy backup and data recovery. Operations are menu driven with a series of graphical screens that guide the operator step by step through the complete test. The software is installed on PC operating under Microsoft Windows®. A 24-bit A/D converter, capable of 1 part in 16777216 resolution is used in the pressure and temperature circuits. The software can be customized with the customer’s data format when communicating test data with the main server computer. This prover also features a Leak Test and High Differential Alarm.

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TECHNICAL FEATURES :   - Traceability to Recognized Standards - Copper/Aluminum Valve Train prevents corrosion and rust accumulation - Check Meter Correlation Feature - Meter Differential Pressure sensing is accomplished via precision pressure transducers for accuracy and stability - Temperature sensing is accomplished via precision thermistors for accuracy and stability

OPTIONS: - Photo Eye Sensor - Electronic Module Pulse Input Adapter - Bar Code Reader - Sonix® Meter Testing - Modem for Remote Access - MTR-II Meter Shop Management Software designed to meet customer specifications