1. How to use:

Open the top cover of the water tank and inject clean water. The height of the water level is slightly lower than the overflow nozzle.
Turn on the power plug, turn on the start switch, and the pump starts working.
Block the nozzle with your fingers, and the corresponding vacuum gauge can reach a vacuum of -0.1Mpa to indicate that the pump is working properly.
There are one-way check valves for each nozzle of the machine. For the sake of safety, more effective measures should be taken at the same time to prevent the water in the pump from flowing back into the pumped container when the pump stops working. The specific methods are as follows: (1) The skin tube between the vacuum pump and the pumped container. (2) The work will be released and the vacuum will be released from the pump.
The ultimate vacuum of a circulating water vacuum pump is limited by the saturated vapor pressure of the water. When working for a long time, the increase in water temperature will affect the degree of vacuum. At this point, the water drain (lower) of the device can be connected to the tap water. The overflow (upper mouth) drains. Properly control the flow to keep the water temperature in the tank from rising and the vacuum is stable.

2. Maintenance:

Regularly maintaining water quality is the key to long-term stable operation of the equipment. Water must be changed regularly and the water tank must be cleaned. Do not draw dust and solid matter.
Some corrosive gases can cause the water quality in the water tank to deteriorate, and bubbles are generated, which affects the degree of vacuum. Therefore, it should be noted that the water is continuously changed.
For special strong corrosive gases, it should be carefully judged whether it is reactive with the materials used in this equipment and used with caution.
If the degree of vacuum is not high, it should first be judged whether the container is leaked or the hose is loosened. In the case of a pump, check the water inlet or each air line for blockage or loose air leakage.
The motor of the circulating water vacuum pump does not turn, and the power supply or fuse should be checked.

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