Industrial Control Summary: He is a force sensor that measures the mass of a force sensor by converting the measurement (mass) to another measured (electricity).

The weighing sensor is an important part of the electronic weighing instrument. When using the weighing sensor, the gravity acceleration of the place of use and the influence of air buoyancy should be considered. The electronic weighing device applies weighing to convert the weight of the measured object into electricity, and then displays the quality of the object through the corresponding detection instrument. Therefore, it can be seen that the performance of the weighing sensor is of critical importance to the performance of the electronic weighing device.

2. composition

The load cell is generally composed of sensitive components, conversion components, measuring components, etc.

(1) Sensitive elements

Directly feels the measured (mass) and outputs other quantities of components that have a definite relationship with the measured. For example, the elastic body of the resistance strain-type load cell transforms the mass of the measured object into a deformation; the elastic body of the capacitive load cell transforms the measured mass into a displacement.

(2) Conversion components

Also known as a sensing element, it converts the output of a sensitive element into a signal that facilitates measurement. Such as resistance strain gauge load cell resistance strain gauge (or resistance strain gauge), the deformation of the elastomer is converted into a change in the resistance; capacitance of the load cell capacitor, the displacement of the elastomer into a change in capacitance . Sometimes some components combine the functions of both sensitive and transforming components. For example, the piezoelectric material of the voltage-type load cell under the effect of the external load will output electricity while being deformed.

(3) Measuring elements

Transform the output of the transform element into an electrical signal to facilitate further transmission, processing, display, recording, or control. For example, the bridge circuit in the resistance strain load cell, the charge preamplifier for the piezoelectric load cell.

(4), auxiliary power supply

Provides energy for the sensor's electrical signal output. General load cells require external power supply to work. Therefore, as a product must be marked the requirements of power supply, but not as an integral part of the load cell. Some sensors, such as magnetoelectric speed sensors, do not need an auxiliary power supply because they output a large amount of energy. So not all sensors need auxiliary power.