Pressure gauge

General pressure gauges are suitable for measuring the pressure of media such as liquids, steam, and gases that are non-explosive, non-crystallizing, non-solidifying, and non-corrosive to copper and copper alloys.
Accuracy class: 2.5, 1.6.
Measuring range: 0-0.1 to 0-100 MPa, -0.1-0, -0.1-2.4 MPa.

General pressure gauges are local indicating pressure gauges that display pressure on-site without remote transmission, display, or adjustment functions. In industrial process control and technical measurement, due to the high mechanical strength of the elastic sensing elements in general pressure gauges, as well as their ease of production, simple installation, and convenient reading, general pressure gauges are increasingly widely used.

Working Principle:

The pressure gauge uses the elastic deformation of the sensing element inside the gauge—the Bourdon tube. Through the transmission mechanism of the movement, the elastic deformation of the Bourdon tube is converted into rotational motion, causing the pointer to deflect and display the pressure.

Bourdon tubes are divided into C-type tubes, helical tubes, and spiral tubes. They are generally made of cold-worked hardened materials (commonly copper alloys), which have high plasticity in the annealed state and acquire high elasticity and strength after cold working, hardening, and stabilization treatment.

The cross-section of the C-type Bourdon tube sensing element is elliptical. The pressure of the measured medium acts on the inner side of the Bourdon tube, causing the elliptical cross-section to tend toward a circular cross-section. Due to the slight deformation of the Bourdon tube, a certain hoop stress is generated. This hoop stress causes the Bourdon tube to extend outward. Since the head of the elastic Bourdon tube is not fixed, it produces a small deformation.

Technical Parameters:

1) Dial diameter (mm): ￠40; ￠50; ￠60; ￠75; ￠80; ￠100; ￠150; ￠200; ￠250

2) Accuracy class (%): 1.0; 1.6; 2.5; 4.0

3) Measuring range (MPa): 0~0.1, 0~0.16, 0~0.25, 0~0.4, 0~0.6, 0~1, 0~1.6, 0~2.5, 0~4, 0~6, 0~10, 0~16, 0~25, 0~40, 0~60, 0~100; -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

4) Reference working conditions

Under the following conditions, the basic error, hysteresis, light tap displacement, and smoothness of pointer deflection of the instrument shall comply with the relevant provisions of this standard.

a) Ambient temperature: 20°C ± 5°C;

b) The instrument is in the normal working position;

c) Load changes uniformly;

Note: Unless otherwise specified, the normal working position refers to vertical installation.

5) Temperature influence: not more than 0.4%/10°C (when the operating temperature deviates from 20±5°C);

6) Execution standard: GB/T1226-2010;^[1-2]

Installation Methods:

1) Radial direct installation

2) Radial with rear flange

3) Axial direct installation

4) Axial with front flange

Usage Precautions:

1) The working pressure should ideally be between 1/3 and 2/3 of the full scale. The maximum usage range should not exceed 3/4 of the full scale.

2) The calibration cycle generally should not exceed six months. For applications with significant pressure fluctuations, frequent use, higher accuracy requirements, or stricter safety requirements, the calibration cycle can be appropriately shortened based on specific conditions.

3) The working environment should be free of corrosive gases.