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Good corrosion resistance and good air tightness
Jul 11, 2018

How to choose the sensor for the electronic weighing instrument

The impact of the environment on the sensor is mainly in the following aspects:

(1) The high-temperature environment causes problems such as melting of the coating material, opening of the solder joint, and structural change of the stress in the elastic body. High temperature sensors are often used for sensors operating in high temperature environments; in addition, devices such as heat insulation, water cooling or air cooling must be added.

(2) The effect of dust and moisture on the sensor causing a short circuit. Under these environmental conditions, a sensor with high airtightness should be used. Different sensors have different ways of sealing, and their airtightness is very different.

Common seals are filled or coated with sealant; mechanically sealed seals for rubber pads; welded (argon arc welding, plasma beam welding) and vacuum-filled nitrogen seals.

From the perspective of the sealing effect, the welding seal is the best, and the filling and sealing agent is the worst. For sensors working in a clean and dry environment, you can choose a rubber-sealed sensor. For some sensors that work in a humid, dusty environment, you should choose a diaphragm heat seal or a diaphragm weld seal. Vacuum nitrogen filled sensor.

(3) In the environment with high corrosivity, such as moisture, acidity, damage to the sensor caused by elastomer or short circuit, etc., the outer surface should be sprayed or stainless steel cover, good corrosion resistance and good airtightness. sensor.

(4) The influence of the electromagnetic field on the sensor output turbulence signal. In this case, the shielding of the sensor should be strictly checked to see if it has good electromagnetic resistance.

(5) Flammable and explosive not only cause complete damage to the sensor, but also pose a great threat to other equipment and personal safety. Therefore, sensors operating in flammable and explosive environments put forward higher requirements for explosion-proof performance: explosion-proof sensors must be used in flammable and explosive environments. The sealed cover of such sensors should not only consider its tightness, but also It is necessary to take into account the explosion-proof strength and the waterproof, moisture-proof and explosion-proof properties of the cable lead.


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