the Up and Cancel keys simultaneously to bring up this interface)
Do this if the instrument has been in use for a year or if recalibration is necessary,
otherwise do not perform this operation. Before calibration, please prepare N2 and SF6
gas with standard purity (such as 95.8% purity SF6 gas, hereinafter referred to as
standard gas). Connect one end of the test pipe to the standard gas cylinder through the
pressure reducing valve, and insert the other end into the instrument inlet. Check whether
the flow valve, the needle valve on the pipeline, and the pressure reducing valve are all
closed. If they are not closed, please close them first; when the instrument is turned on,
the preheating is completed and the measurement interface is automatically entered,
press the "OK" key to enter the menu, and then Select the “Calibration” key down to enter
the calibration screen (as shown below),
Open the pressure reducing valve, set the output flow of the cylinder to within
0.2MPA, and then open the needle valve in an appropriate amount, and then adjust the
flow valve to 0.2LPM. At this time, the value behind Vad will increase continuously. When
it is unchanged, press the "OK" key twice to enter the calibration procedure. At this time,
the first zero after P will flash. Use the up and down keys to increase or decrease the
number. Use the left and right keys to select the number of digits. At this time, you should
change 00.0 to 95.8 and press the "OK" key once, the calibration is completed, and then
press the "Cancel" button, you can see that the purity value appearing on the main
measurement interface is basically close to the nominal value. Access can be recalibrated.
After calibration, please flush it with N2. The method is the same as the measurement
method.
7、Start testing
In the main menu state, press the "Up" and "Down" keys to select "Start Test" and
press "OK" to enter the measurement data page. The instrument will start to measure the
purity of SF6 in real time and display it.
