Why does the flange of diaphragm pressure gauge corrode?

Cause analysis of flange corrosion of diaphragm pressure gauge;

t is obvious that the flange of diaphragm pressure gauge is corroded, and the severity of corrosion is surprising. The flange is made of SUS316 stainless steel, which should have very strong corrosion resistance, but how does the corrosive medium get into the "cavity"? The manufacturer saw a folded crack about 35mm above the diaphragm. Obviously, the corrosive medium to be tested entered the flange "cavity" and even the spring tube welding from this crack. After a long time, the flange was corroded, and the well was immersed to the edge, further eroding the diaphragm welding, resulting in the diaphragm "open welding". Relieve that compressed air will directly rush into the spring elbow, and can also accumulate condensed water;

Improvement measures:

1. As the user of diaphragm pressure gauge, management should be strengthened, and diaphragm pressure gauge should be properly kept, especially flange diaphragm pressure gauge. The thickness gauge of diaphragm is 0.1mm or thinner. If it is improperly placed, the diaphragm will be bruised, and the diaphragm will be damaged, which will make the diaphragm pressure gauge lose its use function.

2, diaphragm pressure gauge installation, before use, should check the appearance of diaphragm pressure gauge. For example, whether the pointer is away from zero, whether the diaphragm pressure gauge has sleeve leakage phenomenon, whether the diaphragm under the flange is damaged, etc. If any abnormal situation is found, report it to the relevant departments in time and contact the manufacturer to solve it.

Where is the vacuum pressure gauge used?

Matters needing attention in the use of vacuum pressure gauge:

1. The operating environment temperature of the instrument is -40~70℃, and the relative humidity is not more than 80%. If it deviates from the normal operating temperature by20℃, the additional temperature error shall be included.

2. The instrument must be installed vertically, and strive to keep the same level with the measuring point. If the difference is too high, it is included in the additional error caused by the liquid column, so it is unnecessary to consider when measuring gas. When installing, block the explosion-proof port at the back of the case to avoid affecting the explosion-proof performance.

3. The measuring range of the instrument in normal use: it shall not exceed 3/4 of the upper limit of measurement under static pressure and 2/3 of the upper limit of measurement under fluctuation.

Under the above two pressure conditions, the minimum measurement of large pressure gauge should not be less than 1/3 of the lower limit, and the vacuum part should be used completely when measuring vacuum.

4. When in use, if the instrument pointer fails or the internal parts are loose and can't work normally, it should be overhauled, or contact the manufacturer for maintenance.

5. The instrument should avoid vibration and collision to avoid damage.

6. When ordering, please indicate: instrument model and name; Measuring range of the instrument; The accuracy grade of the instrument deviates from the requirements of positive packaging and others.

7. Make special design according to user's requirements.

Working principle of explosion-proof electric contact pressure gauge

Explosion-proof electric contact pressure gauge is composed of explosion-proof shell, measuring system, electric contact group, adjusting device and outlet box.

The explosion-proof casing of the explosion-proof electric contact pressure gauge has good explosion-proof performance, so it can not only bear the explosion pressure of the explosive gas mixture in the casing once it causes explosion, but also effectively prevent the heat energy generated from it from spreading smoothly, and can only slowly spread outward along the tiny gap at the explosion-proof joint surface in the casing of the explosion-proof electric contact pressure gauge. At this time, the instantaneous temperature transmitted to the outside of the shell has dropped below the ignition temperature of the explosive gas mixture, so it will not lead to explosion transmission.

The working principle of the explosion-proof electric contact pressure gauge is to detect the elastic deformation of the element (the spring tube in the measuring system), and drive the contacts in the electric contact group to make corresponding actions (closing or disconnecting) through mechanical transmission, so as to make the circuit in the pressure control system be connected or disconnected, thus realizing the purpose of automatic control alarm and on-site indication.

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The explosion-proof electric contact pressure gauge is suitable for measuring the pressure of amorphous and non-solidified explosive mixtures or various non-explosive media in places with explosion danger.

The explosion-proof electric contact pressure gauge can be used with electrical devices (such as relays and contactors) with corresponding explosion-proof performance or taking corresponding safety measures, so as to realize the purpose of automatic control and signaling (alarm) for the controlled system.

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