Application and precautions of weighing sensor

A weighing sensor is a device for converting a mass signal into a measurable output of electrical signals. In the basic concepts and evaluation methods of the main technical indexes of weighing sensors, the old and new national standards have qualitative differences. There are mainly S type, cantilever type, wheel type, plate ring type, membrane box type, bridge type, cylinder type and so on.

mentionload cell, Many people think it’s just a sensor to measure the weight of an object, but it’s not exactly true, it’s been used in a lot of areas. The weighing sensors are similar in principle to the pressure sensors introduced earlier, but they are not the same shape. Modern science and technology industry use of weighing sensors everywhere, the following small series will introduce the application of weighing sensors and matters needing attention.

 Weighsensor application

Electronic weighing device made by weighing sensor has been widely used to all walks of life, realize the rapid and accurate weighing of materials, especially with the emergence of microprocessor, the industrial production process automation, weighing sensor has become a necessary device in the process control, from the previous cannot weighing large tank, hopper, crane scale, automobile scale measuring control, to mixed distribution of ingredients material system, automatic detection in the production process and powder particle feed quantity control, applied the weighing sensor, at present, the weighing sensor is almost used to all weighing areas.

Weighing sensor error

1. Characteristic error

Is caused by the device itself, including DC drift value, incorrect of the slope, or nonlinear of the slope. After all, there will be a gap between the ideal transfer function features of the device and the real features.

2. Application error of the weighing sensor

That is, the errors caused by the operation, including the incorrect placement of the probe, the incorrect insulation between the probe and the measurement site, the errors in the purification of air or other gases, and the incorrect placement of the transmitter.

3. Dynamic error

Sensors suitable for static conditions can have strong damping, so they respond slowly to changes in input parameters, even taking several seconds to respond to step changes in temperature. Some weighing sensors with delayed characteristics can cause dynamic errors in response to rapid changes. Response time, amplitude distortion, and phase distortion all lead to dynamic errors.

4. Insertion error

Is an error caused by changing the measurement parameters when a sensor is inserted in the system. The use of a transmitter that is too large for the system, the dynamic characteristics of the system is too slow, the system of self-heating loaded with too much heat energy, will lead to the insertion error.

5. Environmental error

The use of weighing sensor will also be affected by the swing, temperature, vibration, altitude, chemical volatilization and other environmental effects, these factors are easy to cause environmental errors.

 Note for use of weighing sensor

Resistance strain weighing sensor is one of the most widely used weighing sensor, its durability, reliability, accuracy is not in doubt, it is precisely because of its characteristics, it will encounter some trouble in the use, using the weighing sensor should pay attention to what matters?

1. Pay attention to the use environment

High temperature, dust, humidity and highly corrosive environment, electromagnetic field environment will cause serious damage to the symmetrical heavy sensor. Therefore, attention should be paid to the use environment of the weighing sensor, or choose the corresponding weighing sensor in the established environment.

2. Prevent overload

To avoid overloading the damage to the load sensor, even if the load sensor has a certain overload capacity.

3. Circuit connection

The wires leading to the display circuit or from the circuit shall be shielded cable, and the sensor output signal reading circuit shall not be placed with some equipment that can produce interference and high heat.

4, prevent debris from polluting the sensor

Obfiling the sensor may affect the movement and accuracy of the movable part of the sensor. Set some “baffles” around the weighing sensor or cover the sensor with thin metal plates.

5. Use the electrical bypass route

In order to avoid the damage caused by electric welding current or lightning strike, the sensor shall use hinged copper wire (about 50mm2) to form an electrical bypass, while avoiding intense thermal radiation.

6. Install the level instrument

To ensure the accuracy of weighing, the level of the installation plane of the single sensor is adjusted. In order to match the load of each sensor, the mounting surface of the mounting base of multiple sensors should be adjusted to a horizontal surface as far as possible.

 To take a light, light light

The weighing sensor should prevent any impact, drop, etc., and handle gently. At the same time, the base of the sensor should be flat and clean, with enough strength and rigidity, without any oil film, film, etc.

8. Prevent some lateral forces from acting on the sensor

Can use spherical bearings, joint bearings, positioning fasteners and other structural accessories with automatic positioning or reduction function.

9. The power line and the control line should be twisted together

50 rpm. If the sensor signal line needs to be extended, a special sealed cable terminal box shall be used. If the signal cable is very long, a cable compensation circuit with a relay amplifier should be considered.

10. Electrical connection

The signal cable of the sensor cannot be arranged in parallel with the strong electric power line or control line.

 Conclusion: About the weighing sensor xiaobian introduced here, I believe that with the progress of technology, weighingsensorWith its performance characteristics and advantages, it will be applied in more industries, to bring convenience to people’s production and life.

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