LPG Mass Flowmeter zero calibration operation

First, Let the LPG medium in the flowmeter flow through the operation of 2 ~ 3 minutes, so that the medium is full of flowmeter.
2.  When the Flowmeter running 2 ~ 3 minutes, Then closed Liquid outlet valve, After that,Then closed Liquid inlet valve.
3.  Let the flowmeter stationary for 1 minute, Next for zero calibration.
4. In the display of the main interface, press the Enter key , appear to enter the password *** interface, enter the password “20”, press the Enter key to determine, press the key to select “modify the settings” item, press the Enter key to determine, enter the selection of the “zero-point Calibration” item, press the Enter key to confirm and then press the key to select “Yes”, and then press the Enter key to confirm, the screen will prompt “Zero calibration, please wait”, after the end of the prompt that is, the zero calibration is complete, (Zero calibration is best to calibrate the best continuous) (Zero calibration is best to be continuously calibrated twice)
5. after the zero calibration, run the material first open the inlet valve and then open the outlet valve.