The Influence of Environment on Load Cell for Weigh Bridge

The Influence of Environment on Load Cell for Weigh Bridge

Keyword: load cell for weigh bridge, load cell for scales

The sensor of the weighing scale, also known as the load cell for weigh bridge, is one of the core components of the weighing system. It is responsible for converting the weight of an object into a measurable electrical signal. The following is a detailed introduction to the working principle of the  load cell for weigh bridge:

Basic principle of  load cell for weigh bridges:

The working principle of the  load cell for weigh bridge is mainly based on the principles of strain gauges, bridge circuits, signal amplification, temperature compensation, and data processing.

Environmental Effect:

(1) The high temperature environment causes problems such as melting of coating materials, cracking of solder joints, and structural changes in the stress inside the elastomer for sensors. High temperature resistant sensors are often used for sensors working in high-temperature environments; In addition, insulation, water cooling or air cooling devices must be added.

(2) Dust and moisture can cause short circuits in sensors. Under these environmental conditions, sensors with high airtightness should be selected. Different sensors have different sealing methods, and there are significant differences in their sealing properties.

Common seals include sealant filling or coating; Rubber pad mechanical fastening seal; Welding (argon arc welding, plasma beam welding) and vacuum nitrogen sealing.

From the perspective of sealing effect, welding sealing is the best, while filling and applying sealant varies in quantity. For load cell for scales working in clean and dry indoor environments, adhesive sealed load cell for scales can be selected, while for load cell for scales working in humid and dusty environments, membrane hot sleeve sealing or membrane welding sealing, vacuum filling and nitrogen filling sensors should be selected.

(3) In highly corrosive environments, such as humidity and acidity, which can cause damage to the elastic body or short circuits in load cell for scales, load cell for scales with good corrosion resistance and good sealing properties should be selected by spraying or stainless steel covers on the outer surface.

(4) The influence of electromagnetic field on the output disorder signal of sensors. In this case, the shielding of the load cell for scales should be strictly checked to see if it has good electromagnetic resistance.

(5) Flammable and explosive materials not only cause complete damage to sensors, but also pose a great threat to other equipment and personal safety. Therefore, sensors working in flammable and explosive environments have higher requirements for explosion-proof performance: explosion-proof sensors must be selected in flammable and explosive environments, and the sealing cover of such load cell for scales should not only consider their airtightness, but also their explosion-proof strength, as well as the waterproof, moisture-proof, and explosion-proof properties of cable leads.