Basic definition of weighing sensor technical parameters

Weighing sensor Basic definition of technical parameters: (1) Rated load: The maximum axial load that the sensor can measure within the specified technical index range. However, in actual use, generally only 2/3~1/3 of the rated range is used. (2) Allowable load (or safe overload): The maximum axial load allowed to be applied to the weighing sensor. Overload operation is allowed within a certain range. Generally 120%~150%. (3) Limit load (or limit overload): The maximum axial load that the weighing sensor can withstand without losing its working ability. That is, when the work exceeds this value, the sensor will be damaged. (4) Sensitivity: The ratio of the output increment to the applied load increment. Usually the rated output is mV for every 1V input voltage. (5) Nonlinearity: This is a parameter that characterizes the accuracy of the corresponding relationship between the voltage signal output by this sensor and the load. (6) Repeatability: Repeatability characterizes whether the output value of the sensor can be repeated and consistent when the same load is repeatedly applied under the same conditions. This feature is more important and can better reflect the quality of the sensor. The national standard describes the repeatability error as follows: Repeatability error can be measured together with nonlinearity as the maximum difference (mv) between the actual output signal values ​​measured three times at the same test point. (7) Hysteresis: The common meaning of hysteresis is: when the load is applied step by step and then removed step by step, the readings corresponding to each load level should be the same in ideal conditions, but in fact they are the same. The degree of inconsistency is expressed by the hysteresis error. The national standard calculates the hysteresis error as follows: the maximum difference (mv) between the arithmetic mean of the actual output signal values ​​of three strokes at the same test point and the arithmetic mean of the actual output signal values ​​of three strokes. (8) Creep and creep recovery: It is required to test the creep error of the sensor from two aspects: one is creep: apply the rated load without impact for 5-10 seconds, read the value 5-10 seconds after the load is applied, and then record the output value at a certain time interval within 30 minutes. The second is creep recovery: remove the rated load as soon as possible (within 5-10 seconds), read the value immediately within 5-10 seconds after unloading, and then record the output value at a certain time interval within 30 minutes. (9) Allowable operating temperature: specifies the occasions where this weighing sensor can be used. For example, normal temperature sensors are generally marked as: -20℃ - +70℃. High temperature sensors are marked as: -40℃ - 250℃. (10) Temperature compensation range: indicates that this sensor has been compensated within this temperature range during production. For example, normal temperature sensors are generally marked as -10℃ - +55℃. (11) Zero point temperature effect (commonly known as zero point temperature drift): characterizes the stability of the zero point of this sensor when the ambient temperature changes. Generally, the drift generated within the range of 10℃ is used as the unit of measurement. (12) Temperature effect of output sensitivity coefficient (commonly known as coefficient temperature drift): This parameter characterizes the stability of the output sensitivity of this sensor when the ambient temperature changes. Generally, the drift generated within the range of 10℃ is used as the unit of measurement. (13) Output impedance: Under rated technical conditions, the output resistance value of the sensor is S+ S- [I+ I-] (14) Input impedance: The resistance value of the excitation end of the weighing sensor, E+ E- [V+ V-] (15) Insulation impedance: The insulation resistance between the circuit part of the sensor and the elastic beam. The larger the better. The insulation resistance will affect the performance of the sensor. When the insulation impedance is lower than a certain value, the bridge will not work properly. (16) Recommended excitation voltage: Generally 5~12 volts. Because the regulated DC power supply of general weighing instruments is 5 or 12 volts. (17) Maximum allowable excitation voltage: The maximum supply voltage that the sensor can withstand. It is not recommended to use the maximum excitation voltage. (18) Cable length: The cable length configured by the manufacturer at the factory. It is best not to increase or decrease it without authorization. (19) Sealing protection level IP67: The dustproof and waterproof performance index of the weighing sensor.