Diaphragm pressure gauges consist of various common pressure gauges and diaphragm isolators of different structures to form a closed system filled with sealing fluid. When the pressure of the measured medium acts on the diaphragm, the diaphragm deforms and compresses the sealing fluid in the closed system. Due to the inherent properties of the sealing liquid, the elastic elements in the pressure instrument produce corresponding elastic deformation. When the rigidity of the diaphragm is small enough, the pressure indicated by the pressure gauge is equal to the pressure value of the measured medium.
Diaphragm pressure gauges are commonly used in pressure detection in petrochemical, pharmaceutical, food and other production; it can be used to measure the pressure of media with strong corrosion, high temperature, high viscosity, easy crystallization, easy solidification and solid float When the pressure is detected directly into the ordinary pressure gauge, and it is easy to clean and prevent the accumulation of sedimentary substances, a diaphragm pressure gauge composed of a diaphragm isolator and an ordinary pressure gauge must be used.
Stainless steel diaphragm pressure gauge is mainly used in petrochemical, alkali, chemical fiber, pharmaceutical, food and other technological processes. It is composed of a general-purpose pressure gauge, a connector and a diaphragm isolator. It is used when the measuring medium is strong corrosive, high temperature, high viscosity, easy to crystallize, easy to solidify, and has solid floating matter. Mainly used in petrochemical, alkali production, chemical fiber, pharmaceutical, food and other technological processes, it is composed of general-purpose pressure gauges, connectors and diaphragm isolators. It is used when the measuring medium is strong corrosive, high temperature, high viscosity, easy to crystallize, easy to solidify, and has solid floating matter.
(Chuck Diaphragm Pressure Gauge)
Isolator Type
1. Threaded interface type:
Thread specification: M20×1.5(G3/8in)(G1/2in)(NPT1/2in);
Measuring range: (Mpa)-0.1～0;-0.1～0.06;-0.1～0.15;-0.1～0.3;-0.1～0.5;-0.1～0.9
-0.1～1.5;-0.1～2.4;0～0.16;0～0.25;0～0.4;0～0.6;0～1.0;0～1.60～2.5;
0～4.0;0～6.0;0～10;0～16;0～25;0～40;
2. Open raised face flange type;
Flange specifications: according to the Ministry of Chemical Industry HG, national standard GB and Japanese JIS, American ANSI and other standards
Measuring range: (Mpa)
-0.1～0;-0.1～0.06;-0.1～0.15;-0.1～0.3;-0.1～0.5;-0.1～0.9
-0.1～1.5;-0.1～2.4;0～0.16;0～0.25;0～0.4;0～0.6;0～1.0;0～1.60～2.5;
0～4.0;0～6.0;0～10
(Chuck Diaphragm Pressure Gauge)
The pointer of the instrument and the scale mark on the dial are coated with luminescent agent, so that the pressure can be observed normally in the dark. The meter is resistant to salt spray, and the meter is non-corrosive when used in marine climates.
The selection of the accuracy grade The full scale of the standard gauge ≥ the full scale of the pressure gauge to be tested. The selection of the range is generally performed by the comparison method during the production and verification process of the pressure gauge. How to choose a standard pressure gauge is more important. The following is a brief introduction to the question of how to choose a standard pressure gauge.
(Chuck Diaphragm Pressure Gauge)
The choice of precision grade
Calculate the maximum allowable reference error of the instrument according to the maximum absolute error allowed by the process production and the selected instrument range, and determine the accuracy of the instrument in the specified accuracy level. Generally speaking, the more precise the instrument selected, the more accurate and reliable the measurement results will be. However, it cannot be considered that the higher the precision of the selected instrument, the better, because the more precise the instrument is generally more expensive, and the more troublesome it is to operate and maintain.
Selection example:
When used to measure special media such as viscous or acid-base, diaphragm pressure gauge, stainless steel should be used.
Spring tube, stainless steel movement, stainless steel case or bakelite case.
According to the different mediums to be measured, the pressure gauge should have a specified color code, and indicate the name of the special medium. The oxygen meter must be marked with the words "no oil" in red. Yellow underline color scale and so on.
