How to choose the load cell range?

Relative accuracy: The relative accuracy is based on the rated range. For sensors of the same type, the relative accuracy is generally the same. For sensors with an accuracy of 0.3 R.O., sensors with a range of 100kg and 2t are both 0.3 accuracy grades.

Accuracy: Accuracy can be understood as: accuracy = relative accuracy * rated range, here we can see that the smaller the range of the same sensor, the higher the accuracy. The same type of sensor with a measuring range of 100kg and 500kg is used to measure the weight or force of 10kg respectively. The accuracy of the sensor with a measuring range of 100kg () is better than that of 500kg.

Generally, 10%-30% redundancy should be left as far as possible when selecting the sensor range, which can prevent the impact force in the application from causing damage to the sensor and prolong the service life. For example, the zui force to be measured is 600 ~ 700N, and a sensor with a measuring range of 1KN can be selected.

Considering that different applications have different requirements for accuracy, impact resistance, and service life, the amount of redundancy sometimes reaches 100 percent or even more.

Introduction of main parameters of force sensor

Rated range: the zui large value that the sensor is designed to measure within the range of the marked parameters.

Sensitivity coefficient: the output of the sensor at full-scale load, generally expressed as mV/V.

Zero Balance: The output of the sensor under no load.

Non-repeatability: Under the same environment, the zui output by the sensor when the same weight is repeatedly loaded is generally expressed as a percentage of the rated output.

Non-linearity: the zui difference between the actual "force (increment)-output (mV/V)" curve of the sensor and the straight line connecting the zero output (mV/V) and the rated output (mV/V) of the sensor is generally expressed as a percentage of the rated output.

Hysteresis: The zui difference between the "force (increase)-output" curve of the sensor and the "force (decrease)-output" curve at the same load is generally expressed as a percentage of the rated output of the station.

Creep: The change of the output of the sensor over time under the same load in the same environment is generally expressed as the percentage of the output change of the full-scale load for 30 minutes to the rated output.

Safety overload: Zui large load that is allowed to be applied without causing a sexual offset to the sensor parameters. Generally expressed as a proportion of the rated range (e. g. 150% of F.S.)

Limit overload: the large weight of zui allowed to be added without causing mechanical damage to the sensor. Expressed as a proportion of the rated range.

Compensation temperature range: within the compensation temperature range, the rated output and zero balance will not exceed the marked interval.

Operating temperature range: Within the operating temperature range, the temperature will not have a negative impact on the parameters of the sensor.

Zero temperature drift: The zero output is affected by temperature changes.

Sensitivity temperature drift: Sensitivity (rated output) is affected by temperature changes.

Load cell output signal

Considering that the sensitivity is generally 1.0~2.0mV/V, the power supply voltage is 3~15V, and the output signal range of the sensor is between 0 ~ 30mV, within the error range, the output signal is proportional to the force.

Through the built-in or external amplifier, the sensor can output 0~3.3V,0~5V,0~10V,4 ~ 20mA and other standard signals.