Each flow meter produced in our plant must be calibrated before shipping. And as for our gas flow meters, which are calibrated by our sonic nozzle test bench.
Our sonic nozzle test facility for gas meters is a new generation automatic test facility with high accuracy, high efficiency and good stability.
The test facility is composed of sonic nozzle, dynamic image sampling system, test bench, oil-less vacuum pump, controlling gas circuit, single chip system and PC etc. It adopts sonic nozzle as main standard, the nozzles will be selected automatically by PC according to different flow rate. Single chip and high accuracy A/D conversion technology are introduced to automatically measure temperature, pressure and humidity, involved in error calculation and correction. thus to ensure accuracy of test facility. the whole system can realize full automatic test under PC control and has the function of original data saving, query and printing.