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『Fuel gun flowmeter』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
1. The main factors and influencing factors of metering risk at gas stations are as follows: Equipment factors such as fuel dispensers, gas dispensers, and flow meters exceeding tolerance: Wear and tear of flow measurement converters or sensor failures can lead to measurement deviations, such as discrepancies between the actual oil output and the displayed value after wear and tear. Exceeding the calibration cycle: Measuring instruments that have not been regularly calibrated cannot guarantee accuracy. Lead sealing issue: If the lead sealing of the measuring part is not qualified, the anti cheating system is not activated, or the accuracy of the flow meter does not meet the standard (such as below 0.2 level), it may cause measurement risks. Sealing of fuel gun: Poor sealing can lead to fuel leakage, and the actual fuel amount is less than the displayed value. Malfunction of oil storage tank components: Improper installation of the level gauge or inadequate sealing of the breathing valve may affect the calculation of oil volume or cause oil and gas leakage. 2. Improper operation due to human factors, such as the oil gun not being inserted into the bottom of the tank causing oil and gas to evaporate, or the refueling speed being too fast affecting the stability of flow rate. Irregular behavior: Adjusting parameters or tampering with measuring instruments without authorization for personal gain. Internal and external collusion to steal oil: stealing oil products by stealing oil products, modifying oil delivery parameters, or using the return to storage process to steal oil products. Falsifying accounts: discrepancies between accounts and reality or long-term failure to handle excess oil products. Artificially adjusting 
3. Poor supervision of management factors: lack of supervision on cleaning tank bottom oil, self use oil and other links, or untimely inventory reconciliation leading to discrepancies between accounts and reality. Failure to handle anomalies in a timely manner, such as failure to investigate leaks due to significant damage or overflow, and failure to address high-level alarms, may pose safety or measurement risks. 1. Temperature: Fuel undergoes thermal expansion and contraction. Volume expansion in summer may lead to inflated fuel consumption, while volume contraction in winter may reduce actual fuel consumption.
2. Humidity: High humidity environments may cause measuring instruments to become damp, electronic components to short circuit, or electrostatic interference, affecting the accuracy of sensors and flow meters; Metal parts of oil storage tanks may also rust
3. Terrain and altitude: High altitude areas have low atmospheric pressure, and changes in fuel density may cause measurement errors.
2. How to measure fuel guns
The measurement of fuel guns is mainly completed through three core processes: flow accuracy testing, sealing testing, and appearance inspection, which require the use of professional equipment such as standard chain gauges and metal measuring instruments to operate in accordance with national metrology regulations.
. 1. Flow accuracy measurement uses standard metal measuring instruments (such as 100L/50L specifications) or mass flow meters as reference equipment: • Rated flow testing: Inject oil into the measuring instrument at the maximum flo