How to troubleshoot weighing machine sensor failures
A very important part of the weighing machine is the sensor, which is often referred to as the load cell. The weighing sensor is a key part of the weighing machine. Its function is no less than the heart of the human body. It is used to judge whether the product weighs up to the standard. It is difficult for us to estimate how much loss of key components, such as load cells, will bring to the production line. Therefore, users must check this key component regularly to reduce the loss. Today, Guangdong kenweigh will take everyone to look at the related issues on how to troubleshoot the sensor failure of the weighing machine. 1. Zero point output Check the zero point output, that is, the output value of the sensor when there is no load, and all loads (including static loads such as the scale body and force transmission parts) must be removed, and then test the output of the sensor. The zero point of the sensor should be the value obtained by testing under the conditions required by the design, installation and use of the sensor to prevent the false influence caused by the self-weight of the sensor. 2. Testing the insulation resistance Generally, we require testing the impedance between the lead wire of the sensor and the sensor body (elastomer, housing, etc.). Note, disconnect the sensor from the junction box and the meter. Debug the insulation test box (meter), and then connect one end of the test lead to the sensor cable (output, input, shielded wire, etc.), and one end to the sensor body (elastomer, housing, etc.). Generally, the impedance is ≥5000MΩ. 3. Test the impedance of the bridge. The impedance of the bridge is to test the integrity of the sensor bridge. When testing, the sensor should be disconnected from the junction box and other test equipment. The input and output impedance test is to measure the impedance value at the input end and output end of the sensor with the digital multimeter pen in turn, and compare the test value with the value of the product certificate; the confirmation of the bridge symmetry refers to the measurement with a digital multimeter Taking the impedance between an input terminal and the same output terminal, and measuring in turn, 4 groups of impedance values u200bu200bcan be obtained. In a fully symmetrically compensated sensor, the range of the four groups of impedance values u200bu200bshall not be greater than lΩ (this value for a low-precision multimeter) Must not be greater than 2Ω). 4. To test the sensor output, connect the sensor to a regulated power supply separately, and use an excitation voltage of l0～15VDC. Connect the output end of the sensor to a millivoltmeter (or set the multimeter in the DC millivolt range), load it on the loading end of the sensor according to the installation and use status of the sensor, and observe the output change of the sensor.
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