Judging whether the load cell is good or bad

A load cell is actually a device that converts a mass signal into a measurable electrical output. When using a sensor, we must first consider the actual working environment where the sensor is located, which is very important for the correct selection of load cells. It is related to whether the sensor can work normally, its safety and service life, and even the reliability and safety of the entire weighing instrument. sex.

The weighing equipment may be inaccurate after being used for a long time. For the checkweigher, it will definitely cause product misjudgment. We mentioned in the previous "Checkweigher, Sorting Scale Components and Routine Maintenance Recommendations" that we generally solve such problems by calibrating the weighing controller. But sometimes the checkweigher cannot be restored to normal no matter how to calibrate it. At this time, we need to check the weighing mechanism of the checkweigher in detail, and the core component of the weighing mechanism is the load cell. So how do you judge whether the load cell is good or bad? The editor of Changqing will give you a detailed introduction below.

Judging whether the load cell is good or bad:

1. Observe whether the appearance of the sensor is deformed, cracked, etc. If these conditions occur, you need to contact the manufacturer to replace the new sensor.

2. Find the sensor connection end in the weighing controller (weighing instrument), and measure the sensor connection circuit.

​​Under normal circumstances, the excitation voltage (between EXC+ and EXC-) is 5-10V, and the output voltage (between SIG+ and SIG-) is close to 0 when the device is unloaded, which is less than the maximum output of the sensor. (The maximum output of the sensor = excitation voltage * sensor sensitivity, the sensitivity of the checkweigher sensor is mostly 2mV/V), if it exceeds this range, contact the service provider to apply for a replacement sensor.

3. Measure the resistance of the sensor, and judge the quality of the s