Basic definition of technical parameters of the ho

Basic definition of technical parameters of load cell

basic definition of technical parameters of load cell:

(1) rated load: the maximum axial load that the sensor can measure within the specified technical index range. However, in actual use, only 2/3~1/3 of the rated range is generally used

(2) allowable load (or safety overload): the maximum axial load allowed to be applied by the load cell. It is allowed to work overload within a certain range. Generally 120% - 150%

(3) ultimate load (or ultimate overload): the maximum axial load that the weighing sensor can bear without losing its working capacity. That is, when the operation exceeds this value, the sensor will be damaged

(4) sensitivity: the ratio of output increment to applied load increment. Generally, whether the operating speed of the instrument is MV of the rated output when the input voltage is 1V safely or not

(5) nonlinearity: This is a parameter that represents the accuracy of the corresponding relationship between the voltage signal output by this sensor and the load

(6) repeatability: repeatability represents whether the output value of the sensor can be repeated and consistent when the sensor is re applied under the same load and under the same conditions. This characteristic is more important and can better reflect the quality of the sensor. The expression of repeatability error in the national standard: the repeatability error and nonlinearity can simultaneously measure the maximum difference (MV) between the actual output signal values measured for three times on the same test point

(7) lag: the popular meaning of lag is: when the load is applied step by step and then unloaded in turn, corresponding to each level of load, ideally there should be the same reading, but in fact, we should think about the problem based on long-term interests. The degree of inconsistency is expressed by the index of lag error. In the national standard, the lag error is calculated in this way: the maximum difference (MV) between the arithmetic mean of the actual output signal value of the three strokes and the arithmetic mean of the actual output signal value of the three strokes at the same test point

(8) creep and creep recovery: it is required to test the creep error of the sensor from two aspects: one is creep: add the rated load without impact in seconds, read it in seconds after loading, and then record the output value in turn at a certain time interval within 30 minutes. The second is creep recovery: remove the rated load as soon as possible (within seconds), read it immediately within seconds after unloading, and then record the output values in turn at a certain time interval within 30 minutes

(9) allowable service temperature: Specifies the occasions where this weighing sensor can be applied. For example, the normal temperature sensor is generally marked as: -20 ℃ - +70 ℃. The high temperature sensor is marked as: -40 ℃ - 250 ℃

(10) temperature compensation range: it indicates that this sensor has been compensated within this temperature range during production. For example, the normal temperature sensor is generally marked as -10 ℃ - +55 ℃

(11) zero point temperature effect (commonly known as zero point temperature drift): it indicates the stability of the sensor's zero point when the ambient temperature changes. Generally, the unit of measurement is the drift generated within the range of 10 ℃

(12) temperature effect of output sensitivity coefficient (commonly known as coefficient temperature drift): this parameter represents the stability of the sensor's output sensitivity when the ambient temperature changes. Generally, the unit of measurement is the drift generated within the range of 10 ℃

(13) output impedance: under the rated technical conditions, the output resistance value of the sensor s+ s- [i + i-]

(14) input impedance: the resistance value of the excitation end of the load cell, e+ e- [v+ v-]

(15) insulation impedance: the insulation resistance value between the circuit part of the sensor and the elastic beam, the larger the better, and 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 normally

(16) recommended excitation voltage: generally 5~12 volts. Because the stabilized voltage DC power supply equipped in general weighing instruments is 5 or 12 volts

(17) maximum allowable excitation voltage: the maximum power supply voltage that the sensor can withstand. The maximum excitation voltage is not recommended

(18) cable length: the cable length configured by the manufacturer when leaving the factory. It is better not to increase or decrease without authorization

(1 analyze the cause of vibration of hydraulic universal testing machine 9) sealing protection grade IP67: dust and water proof performance index of weighing sensor. (end)