Gas pump liquor dispenser is used to test the fuel tankers error value, its main USES standard metal gauge, thermometer and a stopwatch realize fuel tankers verification work.A few research institutes have also developed some electronic devices, sensors and meter hand fuel pump prover, typical are:
1) using liquid level gauge acquisition standard metal gauge measuring height of neck, in the standard metal import and internal installation of platinum resistance thermometer gauge, and through the secondary instrument to collect liquid level height and temperature signal, through artificial calculation;Preliminary automated measurement, its gas pump liquor dispenser advantage for faults of sensor accuracy degree is low, the thermometer installed metal standard gauge measuring performance, do not conform to the requirements of the standard metal gauge, and dispenser pump some problems such as not explosion-proof, easy to leak, and the second time receive poor precision instrument;
2) at standard metal gauge imported small displacement meter, using secondary instrument standard metal volume again directly read, the problem is more outstanding.Because displacement meter requires full tube measurement, the researchers used more line transformation implementation of volumetric flowmeter with tube, is bound to residual problems, dispenser pump cause the gross error, and volumetric flowmeter in start work and end work stage, because of traffic increased from zero to maximum, and then from maximum to zero flow, flow point of asymmetric problems, directly affect the measurement error of volumetric flowmeter.Therefore method hand fuel pump is put forward with a range of issues, and gradually fade out the test market, only used as a monitoring means, gas pump liquor dispenser do not have scientific and reliability.