How to carry out anti-corrosion treatment on the liquid receiving part of pressure gauge

What are the main contents of anti-corrosion treatment? If it is used to measure some corrosive media, and the stainless steel elastic element can withstand corrosion for 1 ~ 2 years, then we can choose the general stainless steel pressure gauge. It should be noted that during installation, attention should be paid to making the pressure guide pipe as short as possible, and if necessary, it is better to change the buffer coil into a buffer tank, so as to avoid the problem of blockage.

If the measured medium contains strong corrosiveness, then we need to replace the buffer tank with an isolation tank and add a corrosion-resistant isolation liquid. As for the type of barrier and liquid, it needs to be selected according to the nature of the medium. Note that it should be kept in use for more than half a year without deterioration. If the common isolation fluid can't meet the requirements, then fluorine chlorine oil can be used as the isolation fluid. However, this isolation fluid is expensive, so it should be recycled when disassembling the pressure gauge for reuse.

How to carry out anticorrosion treatment for pressure gauge shell;

1. It is suggested that the casing should be made of stainless steel or sprayed with tetrafluoroethylene in order to prolong the service life of the pressure gauge.

2. It is suggested to improve the protection level of the shell when the ambient humidity is high, so as to prevent external moisture from entering the meter and improve the service life of the pressure gauge.

How to carry out anti-corrosion treatment for the liquid receiving part of pressure gauge;

1. For the general corrosive medium, if the stainless steel elastic element can resist corrosion for 1 ~ 2 years, you can choose the general stainless steel pressure gauge. When installing, the pressure guide tube should be short, and the buffer coil should be replaced with a buffer tank if necessary to prevent impurities from blocking.

2. If the medium is corrosive to stainless steel and copper, the buffer tank can be replaced by an isolation tank, and corrosion-resistant isolation liquid can be added. The type of liquid barrier can be selected according to the properties of the medium to be tested, but it is better to use it for more than half a year without deterioration. If the common isolation liquid is not suitable, fluorine chlorine oil can be used as isolation liquid, but the price is very expensive, so the isolation tank should be made small, and the fluorine oil should be recovered and reused when disassembling.

3. Diaphragm pressure gauges can be used. At present, there are molybdenum-containing stainless steel, Hastelloy and tantalum sheets. The pressure is transmitted between the diaphragm and the ballistic tube with methyl silicone oil, and the minimum range can be 0 ~ 100 kPa. If the diaphragm material is not corrosion-resistant, a layer of F46 diaphragm can be added, but the sensitive bottom of the instrument is reduced. F46 can also be directly used as the isolation diaphragm, but attention should be paid to the permeability of the medium, and fluorine oil can be used as the transmission liquid for high temperature and oil-forbidden media.

What are the uses of remote pressure gauges?

1. The product is suitable for measuring the pressure of liquid, steam and gas which have no corrosive effect on steel and copper alloy. Because a sliding wire resistance transmitter is arranged in the resistance remote transmission pressure gauge, the measured value can be transmitted to the secondary instrument far away from the measurement by electricity, so as to realize centralized detection and remote control.

2. In addition, this pressure gauge can indicate the pressure on the spot, so as to facilitate the on-site work inspection.

3. Now it is more used in field control and data transmission recording. According to the display, it can be divided into pointer remote transmission pressure gauge and digital (transmitter) pressure gauge. According to the signal, analog output signal is available: there is a pressure transmitter, which converts the pressure signal into an electrical signal. Generally, the pressure is not directly displayed, but is transmitted to the subsequent equipment through signals such as current or voltage and frequency. The function of the subsequent equipment is expanded, and the signal transmission distance can reach 1 ~ 3 km (current signal).

4, resistance signal: remote transmission pressure gauge, the transmitted signal is a resistance signal! The transmission accuracy is not high and the distance is limited.

5. Switch signal: the electric contact pressure gauge is connected with the relay for control.

6. Environmental conditions of the meter:-40 ~ 60℃, relative humidity no more than 85%, and vibration and sharp pulsation of the measured (controlled) medium have no obvious influence on the normal operation of the meter.

7. Temperature influence: When the operating temperature deviates from 20 5℃, the additional temperature error is not more than 0.4%/10℃.

8. Degree grade: 1.6.

9. Initial resistance of transmitter: 30 ~ 20Ω

10. Full-scale resistance value of transmitter: 340 ~ 400Ω

11. The applied voltage at the transmitter terminal is not more than 6V.

12. The service environment of the resistance remote pressure gauge is-40 ~ 60℃, the relative humidity is not more than 85%, and the vibration and the sharp pulsation of the measured (controlled) medium have no obvious influence on the normal operation of the instrument.

13. Temperature influence: When the operating temperature deviates from 20 5℃, the additional temperature error is not more than 0.4%/10℃.

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