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1. What are the calibration methods for gas dispenser calibration devices?
There are four main calibration methods for gas dispenser calibration devices:
1. The mass method uses a high-precision balance to directly weigh the mass of a certain volume of gas, and calibrates it by comparing the actual measured mass with the theoretical mass.
. Its measurement accuracy is high, but the operation is relatively complicated and greatly affected by environmental temperature and humidity. Yuru collapse 2. The standard meter method connects a calibrated standard rubber flowmeter with the tested device in series in the same gas path, and compares the measured values of the two under the same operating conditions. This method is easy to operate, but the calibration results are highly dependent on the accuracy and stability of the standard table itself. The critical flow Venturi nozzle method is based on the principle of critical flow. When the gas reaches a critical flow state inside the nozzle, its flow rate is only related to the upstream pressure and temperature. Calculate the standard flow rate for calibration by measuring these parameters. This method has high accuracy and is less affected by downstream pressure, but it has extremely strict requirements for the measurement environment and operating standards. The capacity comparison method fills gas into a standard container of known capacity and calibrates it by comparing the volume of gas filled with the capacity of the standard container. This method requires accurate control of pressure, temperature, and other conditions, otherwise it will significantly affect its accuracy.2. What are the recommended manufacturers for flow meters?
3. Wh
Possible causes of malfunction: No airflow output during refueling
1. Has the microcomputer been reset.
2、 Reset the switch and set the unit price function to check if the LED, power supply, and solenoid valve of the vertical hail device are in normal condition.
3、 Is the keyboard functioning properly. The sales quantity is not recorded on the display screen
1. Is the display reset.
2、 Is the signal connection between the power supply of the flow meter, the flow meter, and the microcontroller normal.
3、 Is the solenoid valve out of control. The solenoid valve cannot be opened. 1. Is the coil energized.
2、 Whether the valve core body can move freely.
3、 Is the center port of the valve hole and the valve core body blocked by dirt.
4、 Is the installation of the dust-proof gasket for the solenoid valve normal. No gaps or excessive apprenticeship.
5、 The temperament contains a lot of water, impurities, and dirt. The solenoid valve does not close
1. Is the coil de energized
2. Is the gap between the valve stems normal.
3、 Is there any foreign object preventing the valve core from moving freely and not returning to its original position.
4、 Whether the spring has deformed or failed.
5、 Is the installation of the dust-proof gasket for the solenoid valve normal. No gaps or excessive apprenticeship.
6、 The temperament contains a lot of water, impurities, and dirt. Insufficient filling pressure of gas cylinder socks
1. Whether the pipeline is blocked by foreign objects.
2、 Is the solenoid valve working properly.
3、 Is the setting and adjustm