How to use and check stainless steel pressure gauge correctly

I will explain to you how to use and check the stainless steel pressure gauge correctly.

Let's take a look at the use and detection methods of stainless steel pressure gauges.

Stainless steel pressure gauge refers to the pressure gauge whose main components, such as spring tube, connector, movement, case and so on, are made of stainless steel with corrosion media such as acid and alkali. Stainless steel pressure gauges are often used in conjunction with the three-way repair valve. Turn the knob of the three-way repair valve clockwise to reduce the valve hole. When the knob is turned clockwise to the end, the corresponding piping will be cut off from the air circuit of the outdoor unit. When two copper tubes are butted, one copper tube needs to be inserted into the other copper tube. At this time, it is often necessary to expand the inner diameter of the end of the inserted copper tube so that the other copper tube can be inserted in a consistent way. Only in this way can the two copper tubes be welded firmly. The bell mouth of the copper tube adopts a mouthpiece, which is connected with the indoor and outdoor units of the split air conditioner through pipes.

Generally, the verification time of stainless steel pressure gauges should not exceed half a year, because the use of stainless steel pressure gauges is related to pressure gauges in production safety and environmental monitoring, so the verification period should be carried out in accordance with the verification procedures, which can only be less than half a year; If the industrial and mining conditions used are harsh, the verification period will be shorter. The medium in the pressure measuring part fluctuates greatly, is frequently used and requires relatively high accuracy. The verification period of the pressure gauge can be shortened appropriately according to the specific situation.

How to solve the oil leakage phenomenon of stainless steel shock-resistant meter

Quanjun Instrument introduces you to how to solve the oil leakage of stainless steel shock-resistant meters.

Stainless steel shock-resistant watch, the medium added inside the watch case is 500 silicone oil, which is not easy to deteriorate when it is in contact with air for a long time at 150℃. When it is in contact with oxygen chlorine at 200℃, its oxidation is also slow. Its service temperature can reach 200℃, its condensation point is -5℃, its viscosity is relatively high, and it has excellent chemical stability and electrical insulation function, and it can also resist moisture and water.

Most other units choose glycerin or transformer oil, mainly because of the price factor. Because one kilogram of silicone oil is 55 yuan, while one kilogram of glycerin and transformer oil only needs more than 10 yuan, and a watch with a shock-resistant surface of 100 needs 0.5 kg, the cost of using silicone oil has increased, but the chemical disorder is good, and the chemical disorder of glycerin or transformer oil is not good, so all our stainless steel shock-resistant meters are filled with silicone oil and fluorine oil.

Stainless steel earthquake-resistant table

Some stainless steel shock-resistant gauges have oil leakage at their joints. The pressure gauge joint and the pressure gauge case are welded by argon arc welding, and whether there is leakage is detected by overpressure welding, so as to solve the problem of oil leakage and oil leakage. For the shock-resistant pressure gauges produced by general pressure gauge units, the instrument joint is fixed outside the instrument case with screws, and three screws are three leakage points. We fix the instrument joint inside the instrument case. To solve the problem of oil leakage on the instrument screw, and the instrument cover, which adopts two sealing rings, will not leak oil on the instrument after the cover ring is removed, unless the instrument cover is destroyed.

Usage and installation instructions of pressure gauge

First, check before installation

A, whether the pressure of the monitored point will exceed the measuring range of the instrument; If it is exceeded, please replace the instrument with appropriate range.

B, whether the pressure of the detected point has instantaneous impact, if so, please pretend to be a buffer.

C, whether the measured medium has high temperature (greater than 85℃); If the temperature is too high, please pretend to be a condenser or radiator.

D, the measured medium should be compatible with the strength and corrosion resistance of instrument shell materials.

E, whether the measured medium will block the pressure hole of the instrument; If possible, the shell should be customized.

Second, the installation method

A, in general, the instrument should be installed vertically to the horizontal direction, so as to facilitate observation;

B, the general standard pressure interface is M20×1.5 external thread, and it should be sealed with sealing gasket such as copper or PTFE when installation;

C, the instrument can be directly installed on the flange interface of the measuring pipeline. In order to facilitate installation and maintenance, a stop valve and a vent valve should be installed between the flange joint and the pipeline.

Third, matters needing attention

A, don't poke the pressure hole with sharp objects or hard objects, and don't press the diaphragm with your hands, which will damage the diaphragm or cause the diaphragm to deform for a long time.

B when the ambient temperature exceeds the product standard, on-site protective measures should be taken to prevent the LCD from being damaged.

C, when installing the instrument, it is necessary to close the stop valve and open the vent valve at the same time, so as to avoid damage to the sensor of the instrument due to excessive pressure caused by pressure holding.

D, if 80℃ or less medium temperature 100℃ or less, should be equipped with condenser tube.

E, when installing the differential pressure gauge, please pay attention to check the high-voltage end and low-voltage end, so as not to damage the sensor.

F, users are not allowed to open the instrument at will, and replace components.

G. Do not change the battery or charge it at will.

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