Resistance strain gauge formaldehyde module hcho module factory is an electromechanical component that converts force signals to electrical signals and is widely used in electronic weighing, automatic control and automatic detection, etc. It is a core component of weighing and detection systems. Its definition, composition and working principle are as follows:

Definition: A force sensor that measures mass by converting one of the measured quantities (mass) into the other (output), taking into account the influence of gravitational acceleration (g) and air buoyancy (f) at the location of use.

Measured (mass)formaldehyde module hcho module factory output

Composition: Sensitive element + sensing element + measurement circuit

Among them: Sensitive element - elastomer; Sensing element - Resistance strain gauge Measuring circuit - Wheatstone Bridge

Working principle: The resistance strain gauge with metal materials as the conversion element is based on the resistance-strain effect of the metal resistance wire. The so-called strain effect refers to a physical phenomenon where the resistance value of a metallic conductor (resistance wire) changes with deformation (elongation or shortening). As shown in the following figure: LDFLdF

1) Resistance value before force application (F=0) \ n2) Resistance change value after force application (F>0

R=ρ·L/S (1) Δ R=R·Kε(2)

In the formula: R - the resistance of the metal wire (Ω); In the formula: Δ R - Change in resistance;

ρ - Resistivity of the metal wire (Ω*M); R - Original resistance value

The 8th National Weighing Technology Symposium

L - The length of the metal wire (m) K - The sensitivity coefficient of the strain gauge

S - Cross-sectional area of the metal wire (m ²)(π d ² /4)ε - Axial strain

D - Diameter of the metal wire (m)

Conclusion: The metal wire stretches and the resistance value increases; When the metal wire is compressed, the resistance value decreases.

After understanding the above composition and principle, it is not difficult to imagine that the failure of resistance strain sensors is often caused by some human or natural factors, such as sensor overload, shock, or accidental drop, vigorous pulling of the sensor wire, lightning strike or large current passing through the sensor, chemical corrosion, moisture erosion or high-dust environment, as well as aging of the components inside the sensor. The direct consequences may be the drift of the weighing system, unstable display or no data display, etc. The following mainly introduces the detection methods and steps related to the sensor part in some common faults of the weighing system, for the reference and application of our users in practice.

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