3.Long press SETTING button to enter setting mode for adjusting unit.(see 6-4
SETTING)
4.There will be 10 digits displayed after instrument turned on. Long press ZERO
button to zero reading.
5.Operate vacuum according to instructive operation of refrigeration system.
6.Obtain test reading of vacuum pressure and vacuum degree.
7.Turn off valve and vacuum source.
6.3. Pressure Leak Test
Pressure Leak Test is used for inspecting how much does pressure change in some
time after refrigeration system has been filled with some refrigerant or vacuumed.
1.Instrument should be turned on with valve turned off.
2.Press FUNCTION button to select Pressure Leak Test mode as below figures.
Figure with“ P”, the small number at top right corner refers to difference value of
pressure.
Figure with“STRT”, the small number at top right corner refers to original pressure.
Figure with“TIME”, the small number at top right corner refers to test time duration
with format “Hour : Minute”.
Difference Value of Pressure
Original Pressure
6