C-Tech H1820, Product Manual, Page: 5 / 10

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during use, it should be replaced with new oil in time to avoid affecting the vacuum degree
or unable to operate. It is best to use vacuum pump oil, or mechanical oil above No. 20.

Before replacing the new oil, it should be turned on for 15 -30 minutes to thin the oil. After
stopping the pump, unscrew the oil drain screw and drain all the dirty oil in the pump. Then
pour 300ml of new oil from the air inlet, start the motor to run for 1 minute to clean the
inside of the pump chamber. Repeat 2-3 times, and after confirming the cleaning, pour in
new oil.
V. Digital vacuum gauge
Our product is a digital vacuum gauge to accurately measure micro change of pressure in vacuum.
You can use the vacuum gauge to monitor the performance of refrigeration systems and heat pumps
(usually during commissioning). And you can gauge the real-time pressure of the refrigeration system
in vacuuming, thus gathering information relevant to dehydration and cleaning foreign body (such as
oil, external gas and etc.). Digital vacuum gauges parallel with vacuum pumps (making vacuum) in
utilization and furthe r, refrigerant gauges (emulation or digital) are often employed to monitor
refrigeration system.
Technical specifications
Vacuum tolerance
±(10%lndicating value+10microns)
(100-1,000microns)
Working temperature - 10~50
℃
Storage temperature
- 20~50
℃
Temperature scale - 10~50
℃
Temperature resolution 0.1
℃
Parameters mmHg, inHg, umHg, ftH
2
O, cm H
2
O, in H
2
O, Pa, Kpa, mbar, bar, Kg/cm
2
, psi, oz/in
2
Measurement cycle 0-26.66mbar / 0-20,000microns
Vacuum resolution
1micron (0-1,000microns)
10microns (1,000-2,000microns)
100microns (2,000-
5,000microns)
500microns (5,000 -10,000microns)