Differential pressure flowmeter for ammonia spray grid branch pipe, on-site U-shaped pipe pressure gauge

1、 Overview:
Differential pressure flowmeter for ammonia spray grid branch pipe, on-site U-shaped pipe pressure gaugeIt is an ideal instrument for measuring rough vacuum pressure. It has a compact and beautiful structure, light weight, and easy installation and operation. Its characteristics are high accuracy, fast response, wide measurement range, stable and reliable. The components are made of stainless steel and have high corrosion resistance, which are all similar to other pressure vacuum gauges. The application of the vacuum meter is very wide, and it can be used in metallurgy, chemical industry, petroleum, light industry, medicine, scientific experiments, as well as central air conditioning units such as lithium bromide refrigeration units. Therefore, it is an ideal instrument that is highly welcomed by users.
The U-type pressure gauge, U-tube pressure gauge, UY series U-tube pressure gauge/differential pressure gauge/vacuum gauge have a wide range of applications in colleges, research laboratories, and industrial and mining enterprises due to their advantages of simple structure, intuitive, durable, easy operation, and low price The structure of a U-shaped tube pressure gauge is a U-shaped glass tube or organic glass tube containing liquid (water, mercury, or spirit, etc.), fixed on a plate surface with a scale marked on it. Can measure positive and negative pressures and pressure differentials below 0.1Mpa The working principle is that before the U-shaped tube pressure gauge is connected to the pressure measuring point, the liquid levels on both sides of the U-shaped glass tube are level at the zero scale line. When one end of the U-shaped tube is connected to the pressure measuring point, the liquid level inside the U-shaped tube will change. If the liquid level on the side connected to the pressure measuring point drops, it indicates that the pressure at the pressure measuring point is positive pressure, otherwise it is negative pressure. The pressure can be calculated by the following formula: P=h ρ g. In the formula, P is the pressure value, h is the liquid level difference on both sides, ρ is the density of the working fluid, and g is the gravitational acceleration If two pressure measuring points are connected at both ends of the U-shaped tube pressure gauge, the differential pressure between the two pressure measuring points can also be measured The specific form, size, material, and installation method can be personalized according to the complex environment on site to better meet the actual usage situation.
2、 Main technical indicators:
Measurement range 0-15KPa 0-30KPa.
Accuracy level 1.0.
3、 Working environment conditions:
Environmental temperature: -5--35 ℃.
Relative humidity: ≤ 85%.
4、 Working principle:
Differential pressure flowmeter for ammonia spray grid branch pipe, on-site U-shaped pipe pressure gaugeIt is a liquid pressure gauge that uses the principle of fluid static equilibrium to measure pressure directly based on the height of the liquid. The two ends of the vacuum gauge glass tube must be balanced, the inner diameter of the glass tube must be uniform, and the top of one side of the glass tube should be closed, while maintaining a certain degree of vacuum at all times. The working medium inside the tube is high-purity mercury. The copper joint of the vacuum gauge is connected to the tested equipment. After the pressure inside the equipment is exhausted by the vacuum pump, the height difference of the mercury column end face inside the glass tube of the vacuum gauge is compared with the scale plate, and the absolute pressure is directly read (the sum of the readings at both ends is the vacuum degree).
5、 Installation and usage instructions:
Install the U-shaped pressure gauge vertically on the equipment. Users can purchase a 6.5mm copper tube and weld it to the copper tube at the top of the vacuum gauge, and weld the other end to the vacuum valve. Please pay attention to the following precautions when welding:
1. The temperature should not be too high to prevent deformation of the copper joint and affect the sealing performance.
2. Copper pipes must be cleaned if possible, and cannot be cleaned with oil.
3. Welding quality assurance requires welding two layers and absolutely no air leakage.
4. Be careful when disassembling the "O" ring, and pay attention to balancing during installation.
When vacuuming, the vacuum valve must be tightly closed, and the vacuum valve should be slowly opened after the vacuum pump is running to prevent the mercury in the vacuum from being extracted and unusable. When stopping the machine, the vacuum valve should also be closed first to prevent strong atmospheric pressure from entering the vacuum gauge glass tube and shattering it.
There is an aluminum scale plate installed behind the glass tube of the vacuum gauge. There are two screws in the middle of the scale plate that have been adjusted to the "0" position before leaving the factory, and users do not need to adjust them again. Mercury, the medium inside the glass tube, is prone to leakage. When assembling and disassembling, the vacuum gauge should be installed and disassembled vertically hand in hand. If the "0" ring is found to be loose or damaged, it should be replaced with a new "0" ring in a timely manner.
6、 Specification and model:

7、 Instructions and precautions for use:
Instructions for using U-shaped pressure gauge:
1. The U-shaped pressure gauge is used to measure the pressure and pressure difference of gases or steam fluids.
2.1 mmH2O equals 9.80665Pa, 1mmHg equals 133.3224Pa
3. There are several specifications of U-shaped liquid pressure gauges according to their maximum measurement
The minimum division scale of the 4.1kPa=1000Pa=102mm ruler is 10Pa. Subtract the two readings at the 0 position below and add the two readings at the 0 position in the middle.
Precautions for using U-shaped pressure gauge:
Before measurement, it is necessary to note that the maximum measurement of all pressure gauges should be greater than or equal to the measured pressure to prevent the working fluid from rushing out of the glass tube mouth.
2. It is necessary to maintain the purity and purity of the inner wall of the glass tube and the working fluid. When not in use, the tube mouth should be covered with gauze or other coverings to avoid affecting the accuracy of measurement and positioning.