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Since 2012 - Smart Weigh is committed to helping clients increase productivity at a reduced cost. Contact us Now!
Author: Smartweigh–Multihead Weighter
A multihead weigher is actually a device that transforms a quality data signal into an electronic signal output that can be accurately measured. When using a sensor, it is necessary to consider the specific office environment where the sensor is located. This is particularly important for the proper use of multihead weigher. It is related to whether the sensor can work normally and other safety and use period, and even the availability of all electronic components. reliability and safety factor. In the basic elements and evaluation methods of the multihead weigher key performance indicators, there are qualitative differences between the old and new national standards.
The multihead weigher distinguishes the pros and cons of the weighing system. After long-term application, the weighing system may be prohibited. Generally, we should deal with such problems according to the calibration of the weighing controller. But sometimes, no matter how to calibrate, the scale body cannot be recovered. At this time, everyone needs to carry out detailed inspection from all levels of the weighing organization, and the key component in the weighing organization is the multihead weigher. At this stage, the weighing system generally uses resistance strain gauge multihead weigher (simulation) as the key component of the weighing organization. It uses the principle of Wheatstone bridge to change the net weight data signal into an electronic signal of linear transformation. There are basically four lines. , the input is 5-10V encouraging working voltage (power supply system working voltage), the output is“mV”It is the net weight data signal of the enterprise.
Next, I will show you how to judge the pros and cons of multihead weighers: 1: Observe and check whether the appearance of the sensor is deformed, cracked, etc. If this happens, you must contact the manufacturer to replace the new sensor. 2: The route I/O measurement method is to find the sensor connection end in the weighing controller (multihead weigher meter), and the measurement sensor is connected to the power circuit. Under normal conditions, the encouraged working voltage (EXC+ to EXC- middle) is 5-10V , the output voltage (between SIG+ and SIG-) is close to 0 when the machine is fully loaded, which is lower than the maximum cardiac output of the sensor. (The sensor is larger and the cardiac output = encourage working voltage * sensor sensitivity, and the multihead weigher sensor sensitivity is mostly 1mV/V.) If the sensor exceeds this range, contact the service provider to apply for replacement of the sensor.
Three: Inductor resistance measurement method: Accurately measure the resistance value of the sensor, and judge the quality of the sensor according to the resistance value 1: Input resistance ≧ output resistance > bridge resistance 2: Under normal conditions, the middle of the bridge resistance is the same or the two groups are the same (Note : The input resistance is the resistor in the middle of EXC+ to EXC-, the output resistance is the resistor in the middle of SIG+ to SIG-, the bridge resistance is the resistance in the middle of EXC+ to SIG+, EXC+ to SIG-, EXC- to SIG+, EXC- to SIG- The above is the way to judge the pros and cons of the multihead weigher in the weighing system. It must be noted that the multihead weigher is not so easy to be destroyed under all normal application conditions. Many common faults are caused by the wrong operation of the scale body. caused by the load. Therefore, in the whole process of weighing system application, disassembly and maintenance, it is necessary to minimize the collision and bumping of hanging objects, and carry out the actual operation strictly according to the weighing scope of machinery and equipment. Five common root causes of multihead weigher bias Then multihead weigher will inevitably cause bias in the application, and what kind of bias will multihead weigher have? What is the reason for the discrepancy? 1. Characteristic deviation.
Caused by the machine itself, including DC drift values, errors in the ramp, or non-linearity in the ramp. In the end, there will be a difference between the idealized migration characteristics and the real characteristics of a machine. 2. Multihead weigher uses bias.
That is to say, the deviation caused by the actual operation, including incorrect placement of the probe, incorrect insulation between the probe and the precise measurement address, incorrect cleaning of gas or other vapors during the entire cleaning process, and inaccuracy of smart transmitters. A variety of deviations caused by incorrect actual operation, such as correct placement. 3. Dynamic deviation. Sensors that use static data standards are extremely vibration-damped and therefore slow to respond to key changes in key parameters, even taking a few seconds to respond to step changes in temperature.
Some multihead weighers with latency characteristics can introduce dynamic biases in response to rapid changes. Response speed, amplitude dropout, and phase difference dropout are all causes of dynamic deviations. 4. Insertion deviation.
This is due to the deviation caused by the insertion of a sensor in the system software, which changes the precise measurement of the main parameters. The application of a system to an excessively large smart transmitter, the dynamic characteristics of the system software is too slow, and the self-heating in the system software loads too much energy, etc., all cause the insertion deviation. 5, natural environment deviation.
Multihead weigher applications are also subject to environmental hazards such as temperature, shaking, vibration, altitude, and compound evaporation, which are all very likely to cause deviations from the natural environment.
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