What Is the Unique Filtering Principle of Laboratory Vacuum Filtration Device?

Vacuum filtration devices are mainly used for high-performance liquid chromatography mobile phase filtration, particulate matter analysis, and microbial contamination detection. They are standing equipment in chemical laboratories. It is made of high-quality borate glass or 316L sanitary stainless steel, which can filter various aqueous solutions, organics, and corrosive liquids during analysis, and can be hot-pressed and disinfected at 121℃.

Lab vacuum filtration device

The laboratory vacuum filtration device adopts an integrated structure design, which collects filter bottles, suction filter funnels, vacuum pumps and other accessories required for laboratory filtration in one machine, to facilitate the overall movement and save laboratory space. It is sturdy and durable, more convenient to wipe and clean when there is filtrate dripping during filtration.

Filtration principle

Within about 10 seconds after the vacuum pump is started, the vacuum negative pressure tank can be drawn into a negative pressure cavity of not less than 91.2KPa (68.4 mmHg), and then the solenoid valve 3 or 5 is connected under the action of the pressure difference, to make the liquid in the filter pan quickly passes through the filter paper to dehydrate. It can be used in chemical analysis, instrument analysis, sanitary inspection, biological products, and petroleum, environmental monitoring, and other aspects of liquid filtration to monitor and remove particles and bacteria in the liquid.

Structural features

The structure is simple, and compact, and the vacuum system works reliably, with a high degree of vacuum. In order to prevent liquid in the vacuum negative pressure tank from entering the vacuum pump, upper and lower contacts are set in the device. When the liquid reaches a predetermined height, the vacuum pump automatically stops, opens the air-release solenoid valve and starts it by itself after the liquid is discharged.

Glass Three-Branches Vacuum Filtrations

How to use it

1. After the external power supply is turned on, turn on the main power switch in the lower-left corner, and the power indicator on the control panel is on.
2. Open the upper ring of the filter disc, lay a filter cloth or filter paper on the porous sieve plate, then lower the upper ring, and use the compression hook to press it to the disc base.
3. Start the vacuum pump, the pointer of the vacuum gauge reaches 91.1KPa in about ten seconds.
4. Pour the slurry into the corresponding filter disc. The solenoid valve filter that starts the working filter disc starts to work. Do not start the non-working filter disc during the filtering process to prevent inflation and damage the normal filtering.
5. When the filtrate surface in the vacuum negative pressure tank reaches the upper contact, the vacuum pump will automatically stop. When the liquid level drops to the lower contact, it will automatically start again, and the filter will continue to work.
6. Stop the pump when the pulp in the filter disc is cake-shaped after suction filtration and then stop the working filter disc solenoid valve. At this time, open the non-working filter disc solenoid valve once to discharge the liquid in the vacuum negative pressure tank in time.
7. Open the upper ring of the filter plate, remove the filter cake and wipe the upper plate ring clean for the next time.
8. It is necessary to check whether there is water in the water separation filter during and after the work. If there is water, it should be released on time.
9. To prevent foreign matter from entering the solenoid valve, cover the two filter discs after the work is finished.
10. Turn off the main power after the test.