The load cell is actually a way to convert the quality signal into a device for the output of an electrical signal for measurement. When using a load cell sensor, you should first consider the actual working environment in which the load cell sensor is located. This is very important for the correct selection of the load cell sensor. It is related to whether the load cell sensor can work normally and its service life.
The impact of the environment on the load cell sensor mainly includes the following aspects:
(1) The high temperature environment causes problems such as melting of the coating material, opening of the solder joints, and structural changes in the internal stress of the elastomer to the load cell sensor. For load cell sensors working in high temperature environments, high temperature resistant load cell sensors are often used; in addition, devices such as heat insulation, water cooling or air cooling must be added.
(2) Dust and moisture will cause a short circuit to the load cell sensor. Under this environmental condition, a load cell sensor with high airtightness should be selected. Different load cell sensors have different sealing methods, and there are great differences in their airtightness.
Common seals include sealant filling or coating; rubber pad mechanical fastening seal; welding (argon arc welding, plasma beam welding) and vacuum nitrogen filling seal.
From the perspective of sealing effect, the welding seal is the best, and the amount of filling and coating sealant is poor. For load cell sensors that work in a clean and dry environment indoors, you can choose a load cell sensor that is glued and sealed. For some load cell sensors that work in a humid and dusty environment, you should choose a diaphragm shrink seal or a diaphragm welded seal. Vacuum nitrogen sensor.
(3) In a highly corrosive environment, such as moisture and acidity that cause damage to the elastic body or short circuit of the load cell sensor, the outer surface should be sprayed with plastic or a stainless steel cover, which has good corrosion resistance and good airtightness load cell sensor.
(4) The influence of the electromagnetic field on the output disorder signal of the load cell sensor. In this case, the shielding of the load cell sensor should be strictly checked to see if it has good anti-electromagnetic ability.
(5) Inflammable and explosive not only cause damage to the load cell sensor, but also pose a great threat to other equipment and people. Therefore, sensors working in flammable and explosive environments put forward higher requirements for explosion-proof performance: in flammable and explosive environments, explosion-proof load cell sensors must be selected. The sealed outer cover of this sensor must not only consider its airtightness, but also It is necessary to consider the explosion-proof strength, as well as the waterproof, moisture-proof, explosion-proof properties of the cable outlets, etc.
