Abstract
This paper presents the basic architecture and working principle of diaphragm gas meter experimental apparatus in the limiting temperature conditions. A double-standard test method with critical flow nozzle as main standard and roots flow meter as reference standard has been proposed. Indicating error and pressure loss characteristic at different temperatures are obtained by experimental research on the metrological characteristics of diaphragm gas meters (G2.5) which are produced by numerous corporations under the condition of non-reference temperature. The experimental results show that the indicating value of diaphragm gas meters under high temperatures is basically accurate, but the metrological property is a little patchy in terms of quality at low temperatures. The maximum indication error of part measuring instruments is up to 16%.
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