Diaphragm pressure gauges can be used to measure the pressure of media with strong corrosion, high temperature, high viscosity, easy crystallization, easy solidification, and solid planktonic substances. In situations where it is necessary to prevent the measurement medium from directly entering the universal pressure instrument and to prevent sediment accumulation and easy cleaning, a diaphragm gauge consisting of a diaphragm isolator and a universal pressure instrument should be used.
Diaphragm pressure gauges are mainly used to measure the pressure of fluid media in industrial sectors such as petrochemical, alkali production, chemical fiber, dyeing and chemical, pharmaceutical, food, and refrigeration. Structural principle: When the pressure P of the measuring medium acts on the diaphragm, the diaphragm undergoes deformation, 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, Δ P is also very small, and the pressure formed by the pressure gauge pressure measurement system is close to the pressure of the measuring 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 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 expansion coefficient of the sealing fluid, the stiffness of the diaphragm, and the temperature of the pressure part, especially for low range pressure instruments, the influence is more significant. The temperature error of the compressed part is generally not greater than 0.1%/℃. Therefore, the total temperature impact of diaphragm pressure instruments is generally the sum of the temperature impact of universal instruments 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 (special specifications should be specified when ordering)
3: Diaphragm material PTFE polytetrafluoroethylene sheet
4: Internal filling of working fluid (1) silicone oil (2) filled according to customer needs
5: Working conditions
(1) Temperature ambient temperature -20~+[1] 55 ℃ Temperature of the measured medium -20~+55 ℃
(2) Work pressure static load: used up to 3/4 of the upper measurement limit value
Alternating load: used up to 2/3 of the upper measurement limit value
Short term 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: Knowledge instrument outer diameter (phi 75mm) phi 100mm
8: Model and form Product model Connection form Scope of use
YTP-75S threaded connection is used to measure pressure in highly corrosive media. For example: chlorine gas, hydrochloric acid, etc.
YTP-100S threaded connection as above
YTP-75SF flange connection is used for pressure applications in highly corrosive, viscous, and crystalline media
YTP-100SF flange connection as above
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