The diaphragm pressure gauge

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YMF diaphragm pressure gauge to enlarge the using range of all kinds of universal pressure gauge, ca…

A, use:

YMF diaphragm pressure gauge to enlarge the using range of all kinds of universal pressure gauge, can be suitable for measuring the corrosive, high temperature, high viscosity, easy to crystallization, easy to solidification and have solid suspended matter medium pressure, and for some measurement medium can not directly into the universal instrument and easy to clean to prevent the pressure testing of the occasions where the precipitation, must adopt the diaphragm isolator with universal pressure gauge table to form a system of diaphragm.
Diaphgram gauge is mainly used in petroleum, chemical, pharmaceutical, food, textile and other industrial department the pressure test in the process of production.
Second, the diaphragm pressure gauge system structure diagram:

Three, diaphragm pressure gauge structure principle:

Diaphragm pressure gauge by all sorts of general and different structure diaphragm type pressure gauge isolator to form a closed system, the sealing liquid filling.

When the measured medium pressure acting on the diaphragm, diaphragm deformation, compression sealing fluid in a closed system.Due to the inherent nature of sealing fluid,

Make the elastic element of pressure gauge produces corresponding elastic deformation, displacement, by indicating device shows pressure value.When the diaphragm of the enough stiffness,

The pressure meter indicates nearby in the pressure value of the measured medium.
Four main technical indicators, diaphragm pressure gauge:

Temperature characteristic of diaphragm table
Because the diaphragm table filled the sealing liquid system as the pressure transmission medium, and the quantity of the diaphragm table temperature sealing liquid expansion coefficient,

Compression of the diaphragm stiffness and parts related to the temperature.For the influence of low range pressure meter is especially striking.General compression zone temperature error is not more than 1.0% / ℃, so the temperature of the diaphragm table is generally by the universal pressure gauge temperature affects measure and diaphragm separator compression zone temperature influence both combined.
Diaphragm table level difference
Especially for diaphragm table with soft connecting pipe, because the diaphragm compression zone and universal pressure gauge installation position is not in the same horizontal plane,

Delta P will produce the effect of liquid level difference.More attention should be paid to in precise measurement.
Diaphragm table of corrosion resistance
Diaphragm table of corrosion resistance can be suitable for the selection and measurement of media contact part of the diaphragm, the flange and the sealing gasket materials to ensure that.
Diaphragm material: 0 cr17ni12mo2 (316);Monel alloy (Cu30Ni70);Hartz alloy (H276C);Tantalum (Ta) and fluorine plastic (F4).
The flange material: stainless steel 0 cr17ni12mo2 (316);Stainless steel lined with fluoroplastic (316 + F4).
Nitrile rubber sealing gasket material:;Fluorine rubber;Silicone rubber and fluorine plastic.
The choice of diaphragm liquid
Reliability and safety guarantee diaphragm table is used, should choose appropriate sealing fluid according to different purposes.

Five, the diaphragm pressure gauge selection table

Six, diaphragm device flange size:

1. Open the convex flange

* all can according to the user or the specified flange standard size manufacturing

2. The i-section convex flange [code] MG range limit: 4 mpa or less

5. Clamp the diaphragm separator [code MC]
6. Nut type diaphragm isolator code [MN]
7. The rectangular flange diaphragm separator [code MH]
Note: 5 and 7 are seen health type diaphragm pressure gauge page.
The attachment, about the isolation diaphragm part corrosion resistant material choice