Weighing Meter Sensor Fault Determination And Maintenance

This article mainly from the automatic weighing instrument sensor fault judgment, use and maintenance aspects of some understanding.Due to the rapid development of electronic information technology, China's weighing instrument products are changing from mechanical to electronic, electronic weighing apparatus based on the principle of resistance strain measurement, a large number of resistance strain type weighing sensor.Weighing sensor is the frontier link of electronic information technology. If there is no sensor to collect and convert the original information reliably, it is difficult to achieve reliable measurement.Here we talk about the use and maintenance of the resistance strain type weighing sensor in the automatic weighing instrument.

1.Service characteristics and fault generation of weighing instrument sensor

(1) Ambient temperature has different effects on different grades of weighing sensors.There is a big difference between the ambient temperature of the sensor in the use site and the verification operation. Therefore, when the user finds that the sensor has excessive temperature drift in use, he/she should take measures to create a local relatively constant temperature environment around it.

(2) Zero change caused by overload and partial load.In use, if the force plane is not parallel to the supporting base plane, the partial load will be bad.Overloading or partial loading will cause a large plastic deformation of a local section of the elastomer, the zero point will suddenly become large, the local stress beyond the strength limit, will cause damage to the sensor.

(3) Zero change caused by electromagnetic field interference.If the sudden impact or change of the space electromagnetic field used in the field causes a considerable amount of inductive potential to be aroused on the bridge network or signal transmission line, the sensor output fluctuation will be caused.

2.Weighing instrument maintenance - fault diagnosis and analysis in the use of sensors

The fault phenomenon of automatic weighing instrument is always shown in the terminal display instrument of the system. After the fault phenomenon is shown, do not blindly disassemble the weighing sensor. It should first judge which link of the measuring system the fault comes from.The following measures can be taken:

(1) Check the installation status of mechanical devices and troubleshoot mechanical faults;

(2) Check whether the cable is injured with the shaking meter;

(3) Open the intermediate junction box, respectively use a multimeter to detect the working state of each sensor, and judge whether a sensor has a fault.With the above method, the fault range is reduced, the fault sensor is found out and the operation of the fault is understood in time and the fault diagnosis is carried out.Therefore, the fault caused by the sensor is often related to the use of illegal operation or mechanical device abnormality.

3. Precautions for the use of weighing instrument sensor

(1) Ground potential grounding should consider the change of electrical equipment load and the impact of lightning;

(2) the screen cover is grounded with the housing to ensure that the sensor itself has a stable zero potential;

(3) the weighing platform is prohibited from placing heavy objects for a long time to prevent the creep of the sensor;

(4) Frequently check whether the system is not smooth.

4 conclusion

In recent years, the sensor of electronic weighing instrument has made rapid development. Various electronic weighing instruments have become the leading weighing equipment.In recent years, our company has purchased more than 100 sets of electronic weighing instruments.Weighing sensor as the key component of electronic weighing apparatus has attracted much attention.In order to reduce or repair the failure of the weighing instrument sensor, it is also very important for the user to transform the site environment, improve the operation method and pay attention to the maintenance and maintenance of the instrument, in addition to the manufacturers to increase their efforts to study the sensor.

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