Diaphragm pressure gauge

Diaphragm pressure gauges are suitable for measuring the pressure of media with strong corrosion, high temperature, high viscosity, easy crystallization, easy solidification, and solid suspended matter. In situations where it is necessary to avoid direct entry of the measuring medium into the universal pressure instrument and prevent sediment accumulation and easy cleaning, a diaphragm gauge consisting of a diaphragm isolator and a universal pressure instrument should be used as a system.

Diaphragm pressure gauges are mainly used to measure the pressure of fluid media in the production processes of industrial sectors such as petrochemicals, alkali production, chemical fibers, dyeing, pharmaceuticals, food, and refrigeration. When the pressure P of the measuring medium acts on the diaphragm, the diaphragm deforms and compresses the sealing fluid of the pressure measuring system of the pressure instrument, forming a pressure of P - △ P. When the rigidity of the diaphragm is small enough, Δ P is also very small, and the pressure formed by the pressure measuring system of the pressure instrument is close to the pressure of the measured medium.

2、 Main technical indicators of diaphragm pressure gauge

Temperature characteristics

Due to the fact that the diaphragm pressure gauge system is filled with sealing liquid as the medium for transmitting pressure, the temperature expansion coefficient of the sealing liquid causes the reading of the pressure gauge to increase with the temperature of the compressed part. The temperature effect is related to the expansion coefficient of the sealing liquid, the stiffness of the diaphragm, and the temperature of the compressed part, especially for low range pressure gauges, the impact is more significant. The temperature error of the general compression part is not more than 0.1%/℃. Therefore, the overall temperature impact of diaphragm pressure instruments is generally the sum of the temperature impact of general-purpose instruments and the temperature impact of the compressed 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: Internally filled with working fluid (1) silicone oil (2) filled according to customer requirements

5: Working conditions

(1) Temperature Environment Temperature -20~+[1] 55 ℃ Temperature of the measured medium -20~+55 ℃

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

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

Short term pressure: used up to the upper limit of measurement

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

(2) Flange connection A: Standard JB81-5 "Flat Welded Steel Flanges" of the Ministry of Machinery Industry

B: Standard of the Ministry of Chemical Industry for Acid Resistant Flat Welded Steel Flanges

C: Our company's flange standards

D: Customize according to user needs

7: Knowledge instrument outer diameter (φ 75mm) φ 100mm

8: Model and Form Product Model Connection Form Scope of Use

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 highly corrosive and adhesive purposes