U type vacuum pressure gaugeDetailed product description：

1、 Overview of U-shaped pressure gauge:

1. The U-shaped pressure vacuum gauge (hereinafter referred to as the vacuum gauge) 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 incomparable 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

Technical parameters

2、 Main technical indicators of U-shaped pressure gauge:

Measurement range 0-15KPa 0-30KPa
Accuracy level 1.0
3、 Working environment conditions for U-shaped pressure gauge:
Environmental temperature: -5--35 ℃
Relative humidity: ≤ 85%
4、 Working principle of U-shaped pressure gauge:
This vacuum gauge is a type of liquid pressure gauge, which is based on the principle of hydrostatic equilibrium and utilizes the height of the liquid to directly measure pressure. 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 use instructions for U-shaped pressure gauge:
Install the vacuum 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, and if possible, ether can be used instead of 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.

The U-shaped pressure gauges produced have the following specifications:
Specification Pa Maximum Measurement Standard Atmospheric Pressure Specification Pa Maximum Measurement Standard Atmospheric Pressure
±500 0-1000 0.13 ±4000 0-8000 1.50
±100 0-2000 0.26 ±5000 0-10000 1.31
±1500 0-3000 0.39 ±6000 0-12000 1.57
±2000 0-4000 0.52 ±8000 0-16000 2.10
±2500 0-5000 0.65 ±10000 0-20000 2.62
±3000 0-6000 0.78 ±15000 0-30000 3.93