General pressure gauge

General pressure gauge

General pressure gauge(produced by shanghai automation instrumentation co., ltd. No. 4 automation instrumentation factory) refers to the spring tube as a flexible element sensitive components, measuring and indicating higher than the ambient pressure of the instrument. In the process of industrial process control and technical measurement, because the mechanical pressure gauge elastic sensor has a high mechanical strength and ease of production and other characteristics, making the mechanical pressure gauge has been more and more widely used. Accuracy class equal to or less than 1.0 of the pressure gauge, vacuum gauge and pressure vacuum table collectively referred to as the general pressure gauge.

Introduction

General pressure gauge is a local indication pressure gauge, the size of the local display pressure, without remote transmission display, adjustment function. In the process of industrial process control and technical measurement, because the general pressure gauge elastic sensor has a high mechanical strength and easy production, easy installation and other simple features, making the general pressure gauge has been more and more widely used.

use

General pressure gauge for measuring no pressure, no crystallization, no solidification, copper and copper alloy without corrosion of liquid, gas or steam pressure and vacuum.

working principle

Pressure gauge through the table within the sensitive element - Borden tube elastic deformation, through the table movement of the conversion mechanism will Borden tube elastic deformation into rotary motion, causing the pointer deflection to show the pressure.

Spring officer is divided into C-tube, coil spring, spiral tube and other types. Generally used cold hardening type material (commonly used material is copper alloy), in the annealed state has a high plasticity, after cold work hardening and qualitative treatment to obtain a high degree of flexibility and strength.

C-type Borden tube sensitive element cross-section was oval, measuring the pressure of the medium acting on the inside of the Borden tube, so that the wave tube elliptical cross-section will tend to circular cross-section. As the Borden tube small deformation, the formation of a certain ring stress. This ring stress will extend the Bourdon tube outward. As the elastic wave board tube head is not fixed, it will produce a small deformation.

Technical Parameters

1) Diameter of dial (mm): Φ40; Φ50; Φ60; Φ75; Φ80; Φ100; Φ150; Φ200; Φ250

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

3) Measuring range (Mpa): 0 to 0.1, 0 to 0.16, 0 to 0.25, 0 to 0.4, 0 to 0.6, 0 to 1,0 to 1.6, 0 to 2.5, 10 to 16, 0 to 25, 0 to 40, 0 to 60, 0 to 100, 0 to 160, 0 to 250, -0.1 to 0, -0.1 to 0.06, -0.1 to 0.15, -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 of the instrument, hysteresis, tapping displacement and the stability of the deflection of the pointer should be consistent with the relevant provisions of GB/T1226-2010.

a) Ambient temperature: 20 ℃ ± 5 ℃;

b) the instrument is in normal working position;

c) the load changes even;

Note: When not specified, the normal working position refers to the vertical installation.

5) Temperature effect: not more than 0.4%/10 ℃ (use temperature deviation 20 ± 5 ℃);

6) Implementation of standards: GB/T1226-2010;

7) Operating temperature: -40 ℃ ~ 70 ℃;

8) Seismic rating: V. H 3;

Installation method

1) Radial Direct (I)

2) axial eccentric direct (Ⅱ)

3) axial concentric direct (Ⅲ)

4) Axial eccentric mounting (IV)

5) Axial concentric mounting (v)

6) Radial bumps (Ⅵ)

7) Axially concentrically convex (VII)

Precautions for use

1) work pressure using the full range of 1/3 to 2/3 is appropriate, the use of the maximum range must not exceed the full scale of 3/4.

2) the test cycle is generally not more than six months, the pressure measurement medium medium fluctuations, the use of frequent, high accuracy requirements, and strict requirements for security factors, according to the specific circumstances of the test cycle should be appropriate to shorten.

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

Installation matters

1, before the installation of the instrument should check the model, specifications, accuracy level is consistent with the use of instrument requirements. Check that the connector thread and the installed female thread are the same.

2, the pressure gauge should be installed vertically, the tilt is generally not greater than 30 °, and strive to maintain the same level with the measurement point, so as not to bring the indication error.

3, after installation, in the absence of pressure, observe whether the pointer in the zero or close to the staple, or should not be used.

4, the measurement of steam pressure, the bottom of the pressure gauge should be equipped with a circular tube, the use of water to pass the steam pressure, so that high-temperature steam into the spring tube, affecting the accuracy of the instrument, or accidentally melt the solder, resulting in instrument leakage Accident or burn people.