Fault Detection Method of Loadcell

1) Before wiring, check the input and output impedance of the sensor. If it has been wired, disconnect the wiring and then measure it. The input impedance (between ex + and ex -) is 400 ± 30 Ω (or 700 ± 30 Ω high resistance type), and the output impedance (between sig + and sig -) is 350 ± 5 Ω (or 650 ± 20 Ω high resistance type). If the impedance is wrong, replace the sensor;
2) If the weighing value is negative, adjust the positive and negative ends of the sensor output signal to be positive;
3) During power on test, the zero point (i.e. empty scale) voltage between the positive and negative terminals of the sensor output signal is 0 ~ 8MV (1 ~ 5mv is better);
4) The analog signal is very sensitive to interference, so the sensor cable should use shielded wire and the length should be as short as possible, and should be far away from other power lines and control lines to avoid interference.
In case of weighing display error or instability during use, repair according to the following steps:
1) Whether the wiring between the sensor and the instrument is correct, and pay attention to whether the connector is firm and whether there is moisture and leakage;
2) Measure the input and output impedance of the sensor. If it is wired, disconnect the wiring before measuring, otherwise the measurement results will be affected by the internal resistance of the instrument. The input impedance (between ex + and ex -) is 400 ± 30 Ω (or 700 ± 30 Ω high resistance type), and the output impedance (between sig + and sig -) is 350 ± 5 Ω (or 650 ± 20 Ω high resistance type). If the impedance is wrong, replace the sensor;
3) Power on and test whether the zero voltage value is between 0 ~ 8m V, otherwise replace the sensor;
4) A single sensor is tested in turn to distinguish the faulty sensor;

5) When connecting for the first time, check whether the color of the positive and negative ends of each sensor signal corresponds, otherwise the signal voltage changes offset each other after being stressed and the display is unstable.