Product Overview
Diaphragm pressure gauges are suitable for measuring the pressure of media with strong corrosion, high temperature, high viscosity, easy crystallization, easy solidification, and solid floating matter, as well as situations where it is necessary to avoid direct entry of the measuring medium into general-purpose pressure instruments and prevent sediment accumulation and easy cleaning.
Product Introduction
A diaphragm gauge consisting of a diaphragm isolator and a universal pressure instrument system.
The main connection methods between diaphragm pressure gauges and equipment include threaded connections, flange connections, and sanitary clamp connections
Diaphragm 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 alkali production.
Structure principle of diaphragm pressure gauge
When the pressure P of the measuring medium acts on the diaphragm, the diaphragm deforms, compressing the sealing fluid of the pressure measuring system of the pressure instrument, causing it 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 measuring system of the pressure instrument is close to the pressure of the measured medium.
technical indicators
1. 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.
2. Accuracy level: 1.6 level; Level 2.5
3. Measurement range (Mpa) Threaded connection type:~0.1~0/0~60/0~100
Flange connection type:~0.1~0/0~25
Clamp hygiene type:~0.1~0/0~2.5
4. Diaphragm material: 0Crl7Nil2Mo2 (316); Monel alloy (Cu30Ni70); Hastelloy alloy (H276C); Tantalum (Ta) and fluoroplastic (F4).
5. Internal filling working fluid: (1) silicone oil; (2) Fill in according to customer needs
6. Working conditions:
(1) Temperature: ambient temperature -20~+55 ℃; Temperature of the tested medium -20~+55 ℃
(2) Work pressure: Static load: Used up to 3/4 of the measurement upper limit value
(3) Alternating load: used up to 2/3 of the measurement upper limit value
(4) Short term pressure: used up to the upper limit of measurement
7. Connection size
(1) Threaded connection: M20 * 1.5 (G3/8 ″ G1/2 ″)
(2) Flange connection:
A. Standard JB81-94 of the Ministry of Machinery Industry for Flat Welded Steel Flanges
B. Standard of the Ministry of Chemical Industry for Acid Resistant Flat Welded Steel Flanges
C. Customize according to user needs
8. Instrument outer diameter: 60mm; φ75mm； φ100mm； φ150mm
9. Instrument execution standard JB/T8624-1997
Explanation of liquid level difference
Especially for diaphragm pressure gauges with flexible connecting pipes, due to the different installation positions of the pressure receiving part and the universal pressure gauge, there will be an impact of liquid level difference △ P as shown in the figure.
Corrosion resistance statement
The corrosion resistance of diaphragm pressure gauges can be ensured by selecting appropriate materials for the isolation diaphragm, flange, and sealing gasket in contact with the measuring medium.
Diaphragm material: 0Crl7Nil2Mo2 (316); Monel alloy (Cu30Ni70); Hastelloy alloy (H276C); Tantalum (Ta) and fluoroplastic (F4).
Flange material: Stainless steel 0Crl7Nil2M02 (316); Stainless steel lined with fluoroplastic (316+F4).
Sealing gasket material: Nitrile rubber; Fluororubber; Silicone rubber and fluoroplastics.
Introduction to Model Marking Examples
Mark 1; Y-100B/SR/MF（A）316/4MPa/50-4.0HGJ46
The universal instrument is a Y-100A stainless steel pressure gauge with SR heat dissipation connection. It adopts an open convex flange MF isolator (flange) made of carbon steel and a diaphragm made of 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 universal 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 0-1MPA, and the flange standard is 20-4.0HGJ47
Mark 3; Y-100B/SR/ML 316/4MPa/M20*1.5
The universal instrument is Y-100A stainless steel pressure gauge, with SR heat dissipation connection and threaded connection. The ML isolator material is stainless steel, and the diaphragm material is 316 stainless steel. The measurement range is 0-4MPA, and the thread specification is M20 * 1.5
Ordering Instructions
1. Please indicate the model, name, measurement range, measuring medium, working temperature, connection form and size, and accuracy level when placing an order.
2. If there are special requirements, please specify them in detail when placing an order.
3. The diaphragm pressure gauge should not be disassembled or replaced with the configured instrument to prevent the leakage of filling fluid and affect its performance.
4. Before ordering, according to the characteristics of the tested medium, such as corrosiveness, easy solidification, and easy crystallization, stainless steel pressure gauges or diaphragm pressure gauges with different corrosion-resistant materials should be selected based on the characteristics of the corrosive tested medium. High temperature melt diaphragm pressure gauges should be used in high-temperature environments, while general pressure gauges can be used for general media such as water, non corrosive gases to copper or copper alloys.