A density meter, also known as a densimeter, is a device that measures the density. Density is usually abbreviated as either Ï or D. Typically, density either has the units of kg/m³ or lb/ft³. The most basic principle of how density is calculated is by the formula: Ï=m/V Where: Ï = the density of the sample. m = the mass of the sample. V = the volume of the sample. Many density meters can measure both the wet portion and the dry portion of a sample.
Measuring the density and specific gravity at a given temperature, density meters are especially useful when working with viscous liquids or difficult gases. Portable or benchtop densitometers have high storage potentials for easy comparisons of collected data.
High-efficiency filter, sub-high efficiency filter, ultra-high efficiency filter, how long does the high-efficiency filter change? ()? Whether it is applied to the air conditioning unit or the endless air supply in the clean room, the sub-high efficiency filter has a certain life, which time is the most reasonable replacement? How should we determine it? In what case is it best to replace it? Qilu Purification is the most professional manufacturer of sub-high efficiency filters in China. The air cleanliness monitoring adopts the “multi-point control sampling†test method. The static method is the main one, and the dynamic method is the supplement. Use the most professional eye to evaluate the reasonable time for the replacement of the sub-high efficiency filter!
1. The sub-high efficiency filter resistance has exceeded the rated initial resistance of 100Pa, or equal to 2× design or running initial resistance (3 times for low-resistance sub-efficiency) for more than 1 year, and can be replaced at any time beyond the standard.
2, the coarse and inefficient filter resistance has exceeded the initial resistance of 60Pa, or equal to 2 × design or initial resistance of 3-6 months of operation, more than standard replacement at any time, weekly coarse filter, medium efficiency filter, return air device Wash once.
3. Change the initial effect and medium efficiency filter once every 6 months. The high-efficiency filter is replaced every year. The resistance of the medium-efficiency filter has exceeded the rated initial resistance of 80Pa, or equal to 2× design or the initial resistance of the operation for 6-12 months.
4. The high-efficiency filter resistance has exceeded the rated initial resistance of 160Pa, or equal to 2× design or running initial resistance for more than 3 years, and is replaced at any time beyond the standard. Installation of high efficiency air filters in the operating room shall comply with the following regulations:
1) The operating room high efficiency air filter should be installed immediately after passing the visual inspection;
2) The frame for installing the high-efficiency filter should be flat and clean, and the flatness deviation of the mounting frame of each filter should not exceed 1~2mm;
3) The installation direction of the filter must be correct. After installation, the filter and the interface should be tightly sealed;
4) When the high-efficiency filter is mechanically sealed, it should be sealed with a gas-tight gasket. The thickness of the high-efficiency filter is 6~8mm and it is closely attached to the filter frame. After installation, the compression of the padding should be uniform, and the compression ratio is 25~50%. Scanning and leak detection should be performed after installation;
5) When the high-efficiency filter is hydraulically sealed, the rack should be installed at a level that is free from leakage; there is no dirt or moisture in the tank. The height of the sealing liquid in the tank should be 2/3 of the groove depth, and the melting point of the sealing liquid should be higher than 50 °C. 
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