Diaphragm pressure gauge

Product Details

1、 Product Overview

YTP diaphragm pressure gauge is suitable for measuring the pressure of media with strong corrosion, high temperature, high viscosity, easy crystallization, solidification, and solid floating matter, as well as avoiding direct entry of measuring media into general-purpose pressure instruments and preventing sediment accumulation and easy cleaning. A diaphragm gauge consisting of a diaphragm isolator and a general-purpose pressure instrument should be used.

Diaphragm pressure gauges are mainly used for measuring fluid medium pressure in industrial sectors such as petrochemical, alkali making, chemical fiber, dyeing, pharmaceutical, food, and refrigeration.

2、 Structural Principles

When the pressure P of the measuring medium acts on the diaphragm, the diaphragm undergoes deformation [2], compressing the sealing fluid of the pressure measuring system of the pressure instrument to form a pressure of P - △ P. When the rigidity of the diaphragm is small enough, then Δ P is also very small, and the pressure formed by the pressure gauge pressure measuring system is close to the pressure of the measuring medium.

3、 Main technical indicators of diaphragm pressure gauge

temperature characteristic

Due to the fact that the diaphragm pressure gauge system is filled with sealing fluid as the medium for transmitting pressure, the temperature expansion coefficient of the sealing fluid causes the reading of the pressure gauge to increase as the temperature of the pressure part increases. The temperature influence is related to the sealing fluid expansion coefficient, diaphragm stiffness, and pressure part temperature, especially for low range pressure instruments. The temperature error of the general pressure part is not more than 0.1%/℃. Therefore, the total temperature impact of a diaphragm pressure instrument is generally the sum of the temperature impact of a universal instrument and the temperature impact of the pressure part of the diaphragm device.

1: Accuracy level 1.5

2: Measurement range (Mpa) 0~0.1 0~0.16 0~0.25 0~0.4 0~0.6 (please specify special specifications when ordering)

3: Diaphragm material PTFE polytetrafluoroethylene sheet

4: Internal filling with working fluid (1) silicone oil

(2) Fill in according to customer needs

5: Working conditions (1) Temperature ambient temperature -20~+[1] 55 ℃

Temperature of the tested medium -20~+55 ℃

(2) Working pressure static load: up to 3/4 of the upper measurement limit value

Alternating load: used up to 2/3 of the upper measurement limit value

Short time pressure: used to measure the upper limit value

6: Connection size (1) Thread connection: M20 * 1.5 (G3/8 ″ G1/2 ″)

(2) Flange connection A: Ministry of Machinery Industry standard JB81-5 "Flat welded steel flanges"

B: Ministry of Chemical Industry standard "Acid resistant flat welded steel flanges"

C: Our company's flange standards

D: Customized according to user needs

7: Outer diameter of knowledge instrument（ φ 75mm) φ 100mm

8: Model and form

Product Model Connection Form Usage Scope

YTP-75S threaded connection is used to measure the pressure of highly corrosive media. For example: chlorine gas, hydrochloric acid, nitric acid, etc.

YTP-100S threaded connection as above

YTP-75SF flange connection is used for pressure applications in highly corrosive, viscous, and easily crystalline media

YTP-100SF flange connection as above

4、 Diaphragm pressure gauge

4、 Explanation of liquid level difference of diaphragm pressure gauge

Especially for diaphragm pressure gauges with flexible connecting pipes, the installation position of the pressure part and the universal pressure gauge is different, which will result in the influence of the liquid level difference △ P as shown in the figure.

5、 Explanation of corrosion resistance of diaphragm pressure gauges

The corrosion resistance of diaphragm pressure gauges can be ensured by selecting appropriate materials for the diaphragm, flange, and sealing gasket in contact with the measuring medium.

Diaphragm material: 0Crl7Nil2Mo2 (316); Monel alloy (Cu30Ni70); Hastelloy (H276C); Tantalum (Ta) and fluoroplastics (F4).

Flange material: stainless steel 0Crl7Nil2M02 (316); Stainless steel lined with fluoroplastic (316+F4).

Sealing gasket material: nitrile rubber; Fluorine rubber; Silicone rubber and fluoroplastics.

6、 Example of Model Marking for Diaphragm Pressure Gauges

Mark 1; Y-100B/SR/MF (A) 316/4MPa/50-4.0HGJ46

The general instrument is a Y-100B stainless steel pressure gauge, with a connection type of SR heat dissipation. The open raised face flange MF isolator (flange) is made of carbon steel, and the diaphragm material is 316 stainless steel. The measurement range is 0-4MPA, and the flange standard is 50-4.0HGJ46

Mark 2; YSG-2/ZMG (B) Ha/1MPa/20-4.0Hgj47

The general instrument is the YSG-2 inductive pressure transmitter, which is connected directly. Adopting I-shaped flange MG, the isolator (flange) material is 1CR18Ni9, the diaphragm material is Hastelloy, the measurement range is 0-1MaA, and the flange standard is 20-4.0HGJ47

7、 Ordering instructions

1. Please indicate the model, name, measurement range, joint thread size, and accuracy level when ordering.

2. If there are special requirements, please provide detailed instructions when placing an order.

The selection of diaphragm material for diaphragm pressure gauges: For strong acid media, HC HB TA diaphragm should be used, with PTFE lining. For strong alkali media, 316L diaphragm should be used.