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How to prevent corrosion, shock and dust in the use of radar level transmitter

DATE: 2019-04-17

How to prevent corrosion, shock and dust in the use of radar level transmitter

The radar level transmitter is an indispensable monitoring device. On one hand, the level transmitter can play the role of maintaining the smooth operation of the chemical production line, and on the other hand, it plays the role of life and property safety protection. For field instruments In terms of long-term exposure, the sun and rain, the instrument is prone to failure, then we need to do the instrument's anti-seat, anti-shock and dust-proof work, plus strengthen the management and maintenance of the instrument can not only improve the accuracy of the instrument can also extend the service life of the instrument. Here is how the field instrument is anti-corrosion, shockproof and dust-proof!

Anti-corrosion maintenance of field instruments

1.the choice of materials

Targeted selection of corrosion-resistant metal or non-metallic materials to manufacture parts of the instrument is the fundamental method for industrial instrumentation to prevent erosion. For example, titanium-like, metal-like parts are very strong for chlorine chemical media.

Corrosion resistance; instrument parts and gaskets made of poly tetra ethylene material are also widely used in various corrosive media environments.

2.the insurance layer

The formation of a protective layer on instrument parts or components is a common anti-corrosion method in the industry. According to the material of the protective layer and the forming principle, it can be divided into the following three types.

Metal barrier protection layer. Including spraying, plating, hot dip, car burizing, etc.

Non-metallic protective layer. Such as paint, acid-resistant cement, rubber, plastic, concrete, etc.

A non-metallic protective film is chemically treated on a metal surface to form a protective film such as an oxide film or a phosphate film;

3.Use spacer

This is an effective way to prevent skincare media from coming into direct contact with the meter. When it is not possible to select a suitable corrosion-resistant meter, the isolation solution can be used for isolation. Isolation fluid is often used for pressure and flow in corrosive media volume, level measurement. The spacer fluid must not be mutually soluble and chemically affected by the measured medium, nor can it be corrosive to the meter measuring components. The density of the spacer should be different with respect to the medium being tested and the working medium of the meter

It is vacant, and its density and viscosity should not change significantly when the ambient temperature changes; it should also have good fluidity. In case of accident, when the spacer fluid is mixed into the measuring pipeline, it should not be affected.

Measure the use of the media. For example, glycerin aqueous solution is suitable for oily beauty, water gas, semi-water gas, C1, C2 and other hydrocarbons; ethanol is suitable for propane, butane and other media; methyl silicone oil is suitable for dehumidification chlorine gas.

Gas and liquid.

4.diaphragm isolation

Corrosion-resistant diaphragms are used to isolate the spacer or filling fluid from the measured medium for corrosion protection purposes. It is suitable for highly corrosive media, difficult to use in-tube isolation or container isolation, usually suitable for

Pressure measurement, no differential pressure measurement is declared. The isolating diaphragm should be elastic and impervious, such as the commonly used diaphragm pressure gauge, single flange anti-corrosion pressure transmitter and so on.

5. blowing method

This is to use the blown air (or inert gas such as nitrogen) to isolate the measured medium from the surface of the meter measuring component. The air blowing method is usually used for a liquid pressure measuring system of normal pressure or low pressure, and the blowing gas should not be corroded.

The measured medium acts. According to the principle of constant pressure of the blowing method, the blowing liquid (clean liquid such as water) method is also applied in the flow rate and liquid level measuring system. For example, blowing steam condensate to isolate the medium to the instrument

The table measures the corrosion of the components and eliminates the blockage of the pressure guiding tubes.

Dust maintenance of field instruments

The dust proof method on the outside of the instrument is to protect the instrument or put it in the sealed box.

For the protection of dust, impurities and particles in the tested medium, in addition to measures to prevent clogging by measures such as reducing dust, it is usually used to thicken the ingestion tube, add a dust collector, add a blower and add protection.

Screen protection and other methods.

The crude extraction tube is often used in combination with a dust collector and a purging device. When measuring the flow rate using an orifice plate without a ring chamber, you can directly use a 1.5 to 2 m thick ingestion tube at the pressure tap and add a plug to facilitate the repair.

Clean the holes or use them as a vent. In the liquid level measurement, in order to prevent crystallization in the negative pressure tube, a vacuum condensate may be used for the negative pressure tube. For gas measurement of moisture, water separators can be used

This is common in pressure and flow measurements.

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