The judgment of the quality of the weighing instrument and the analysis of the five common error causes of the weighing instrument
The weighing instrument is actually a device that converts the quality data signal into an electronic signal output that can be accurately measured. When using a sensor, we must first consider the specific office environment where the sensor is located. This is particularly important for the proper use of a weighing instrument. It is related to whether the sensor can work normally, other safety and service life, and even all electronic weighing instruments. The credibility and safety factor. There are qualitative differences between the new and old national standards in the basic elements and evaluation methods of the key performance indicators of the weighing instrument. The pros and cons of the weighing instrument can be distinguished after long-term application. The weighing system may be prohibited from weighing. Generally, we have to deal with such problems according to the calibration of the weighing controller. But sometimes no matter how the calibration is done, the scale body cannot be restored. At this time, everyone needs to carry out a detailed inspection from all levels of the weighing organization, and the key component in the weighing organization is the weighing instrument. The current weighing system generally uses a resistance strain gauge weighing instrument (simulation simulation) as the key component of the weighing organization. It uses the Wheatstone bridge principle to change the net weight data signal into a linearly transformed electronic signal. There are basically four Line, type as 5-10V encouraged working voltage (working voltage of power supply system), and output as the net weight data signal of the enterprise in mV. Below I will take everyone to grasp the method of judging the pros and cons of the weighing instrument: 1. Observe whether the sensor is deformed or cracked. If this happens, you must contact the manufacturer to replace a new sensor. Two: Route I/O measurement method: Look for the sensor connection terminal in the weighing controller (weighing instrument), and the measuring sensor is connected to the power supply circuit under normal conditions, and the working voltage (between EXC+ and EXC-) is encouraged to be 5-10V , The output voltage (between SIG+ and SIG-) is close to 0 when the machine is fully loaded, which is lower than the larger cardiac output of the sensor. (Larger sensor output u003d encouraging working voltage * sensor sensitivity, the sensitivity of the checkweigher machine sensor is 1mV/V in the majority), if it exceeds this range, contact the service provider to apply for the replacement of the sensor. Three: Inductor resistor measurement method: accurately measure the resistance value of the inductor, and judge the quality of the inductor according to the resistance value 1: input resistance ≧ output resistance> bridge resistance 2: under normal circumstances the bridge resistance is the same or the two groups are the same (Note : The input resistance is the resistor between EXC+ and EXC-, the output resistance is the resistor between SIG+ and SIG-, and the bridge resistance is the resistor between EXC+ and SIG+, EXC+ and SIG-, EXC- to SIG+, EXC- and SIG- The above is the judging method of the weighing instrument in the weighing system. It must be noted that the weighing instrument is not so easy to be destroyed under all normal application conditions. Many common faults are caused by incorrect operation of the scale. Caused by the load of the weighing instrument. Therefore, in the whole process of weighing system application and disassembly and maintenance, we usually need to minimize the collision of hanging objects and bumps, and carry out actual operations in strict accordance with the weighing scope of machinery and equipment. The root causes of the five common deviations of the weighing instrument So the weighing instrument will inevitably cause deviation in the application, and what kind of deviation will the weighing instrument have? What causes the deviation? 1. Characteristic deviation. It is caused by the equipment itself, including the DC drift value, the error of the slope, or the non-linear shape of the slope. After all, there will be a difference between the idealized migration characteristics and true characteristics of machinery and equipment. 2. The application deviation of the weighing instrument. That is, the deviation caused by actual operation, including the incorrect placement of the probe, the wrong insulation layer between the probe and the accurate measurement address, the incorrect cleaning of the gas or other vapors, and the inaccuracy of the smart transmitter. Various deviations caused by incorrect placement, etc. 3. Dynamic deviation. Sensors that apply static data standards will have extremely strong vibration damping, so it is slow to respond to changes in key parameters, and it may even take a few seconds to respond to a step change in temperature. Some weighing instruments with delay time characteristics will cause dynamic deviations when responding to rapid changes. Response speed, amplitude drop frame and phase difference drop frame all cause dynamic deviations. 4. Insertion deviation. It is because when a sensor is inserted into the system software, the deviation caused by changing the main parameters of accurate measurement. Applying a system to excessively large smart transmitters, excessively slow dynamic characteristics of the system software, and too much energy loaded into the system software for self-heating, etc., all cause insertion deviation. 5. Deviations from the natural environment. The application of the weighing instrument is also subject to environmental hazards such as temperature, shaking, vibration, altitude, compound evaporation, etc. These elements are very easy to cause deviations in the natural environment.
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