Environmental influences weigh sensor selection

Environmental influences weigh sensor selection

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It is very difficult for purchasing personnel to choose the type of weighing sensor. The main reason is the installation problem. A weighing sensor is actually a device that converts a mass signal into a measurable electrical signal output. Then the actual installation environment of the weighing sensor should be considered as the first consideration, which is related to the normal operation of the sensor and its safety and service life, and even the reliability and safety of the whole weighing device.

Why it can be said that the installation environment of the weighing sensor occupies a big factor, we can consider from the following aspects. First of all, the melting of coating materials, solder joints and structural changes of internal stress of elastomer are caused by high temperature environment. For high temperature working under the weighing sensor is often used high temperature sensor, special circumstances must be added with heat insulation, water cooling or air cooling devices. The second is the influence of dust and humidity on the short circuit of the sensor. In this environment, the weight sensor with high tightness should be used. The sealing methods of different weighing sensors are different, and the sealing property is very different. Common seals have sealant filling or coating; Rubber pad mechanical fastening seal; Welding argon arc welding, plasma beam welding and vacuum filled nitrogen seal. From the sealing effect, welding seal is the best, filling and coating sealant is the difference. For the indoor clean, dry environment of the sensor, can choose the sensor coated with sealant, and for some in the humid, dust high environment of the sensor working, should choose the diaphragm hot sleeve seal or diaphragm welding seal, vacuum filled with nitrogen sensor.

Weighing sensors operating in the above two environments should have strict requirements. Of course, some environments are also easy to reach. Factors such as highly corrosive environment, strong electromagnetic field and inflammability are all necessary considerations for weighing sensors. Secondly, the selection of the quantity and range of the weighing sensor. The quantity of consideration is the source of the installation and the point of force is very relevant. We need to consider it according to different stress points and different weights.

The selection of the number of sensors is based on the use of the electronic weigher, the number of points needed to support the scale body (support points should be determined according to the principle of making the weight geometric center of gravity and the actual center of gravity coincide). Generally speaking, the scale body has a few support points to choose a few sensors, but for some special scales such as electronic hook scale can only use a sensor, some electromechanical scales should be based on the actual situation to determine the number of sensors to choose. The selection of the appearance size of the weighing sensor mainly depends on the type of weighing and the installation space, so as to ensure proper installation and safe and reliable weighing. On the other hand, consider the manufacturer's advice. Manufacturers will generally according to the force of the sensor, performance indicators, installation form, structural type, elastomer material and other characteristics of the sensor applicable scope, such as aluminum cantilever beam sensor is applicable to valuation scale, platform scale, case scale, etc.; Steel cantilever beam sensor is suitable for hopper scales, electronic belt scales, sorting scales, etc. Steel bridge type sensor is suitable for rail scale, truck scale, crane scale, etc. Column sensor is suitable for truck scale, dynamic track scale, large tonnage hopper scale, etc. There are various types of weighing sensors. It is suggested that the procurement staff provide the technical requirements and installation environment to the sensor manufacturers, so that we can recommend suitable weighing sensors for you according to your needs, so as to avoid the occurrence of selection errors that may cause delay of your construction period or even cause unnecessary losses.

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