C-Tech H1820, Product Manual, Page: 4 / 10

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restore the pressure in the container to atmospheric pressure (no more than 8KPa per second).
IV. Matters need attention
① . The instrument is equipped with an air drying device to ensure that the gas entering the vacuum
pump is dry gas. If it is found that water is drawn into the pipeline due to wrong operation, the
back cover of the box should be opened, and the drying device should be opened for drying.
② . After the vacuum pump is started, if the value of the barometer stops, it means that the container
is not tightly sealed or the pipeline is leaking.
③ . After the test, the container should be cleaned in time, and the water traces on the container,
lid, vibration table and instrument should be wiped.
④ . After unpacking, install the instrument horizontally in a dry, ventilated and clean place, and the
ambient temperature should not exceed 40°C.
⑤ . It is strictly forbidden to drop water into the instrument box due to operating errors.
⑥ . Except for oil change and drying the drying device, it is strictly forbidden to dismantle the
protective plates of each part of the instrument if it is not a professional technician of the
company.
⑦ . Precautions for maintenance of vacuum pump:

The temperature of the pumped gas cannot exceed 40
℃
, and the operating environment
temperature is: 5
℃
-40
℃
.

It is strictly forbidden to run without oil. Do not block the exhaust port when the pump is
running. During the test, oil mist-like gas will be emitted from the box, which is a normal
phenomenon.

Long-term work should always pay attention to whether the pump oil is sufficient. The oil in
the fuel tank cannot be lower than the center of the oil mark. Insufficient oil will affect
performance and even damage components.

To keep the oil clean. The new oil needs to be changed every 250 -300 hours after the new
pump is used. If the pump oil becomes dirty, turbid, enters water or other volatile substances