The weighing sensor Basic definition of technical parameters:
(1) Rated load: sensor Larger axial load that can be measured within the specified technical specifications. But in practice, it is only 2 / 3 ~ 1 / 3 of the rated range.
(2) Permissible load (or safety overload): the larger axial load allowed to be applied by the load cell. It is allowed to work overload within a certain range. Generally, it is 120% ~ 150%.
(3) Ultimate load (or ultimate overload): the larger axial load that the load cell can bear without losing its working capacity. This means that when the operation exceeds this value, the sensor will be damaged.
(4) Sensitivity: the ratio of output increment to load increment. Normally, MV of rated output per input voltage of 1V.
(5) Nonlinearity: This is a parameter that characterizes the accuracy of the corresponding relationship between the output voltage signal of the sensor and the load.
(6) Repeatability: repeatability indicates whether the output value of the sensor can be repeated and consistent when the same load is applied repeatedly under the same conditions. This feature is more important and can reflect the quality of the sensor. The expression of repeatability error in national standard: repeatability error can be larger difference (MV) between repeatability error and actual output signal value of three measurements at the same test point.
(7) Lag: the common meaning of lag is: when the load is applied step by step and then unloaded in turn, the corresponding load of each level should have the same reading under ideal conditions, but in fact it is consistent. The degree of inconsistency is expressed by the index of lag error. In the national standard, the lag error is calculated as follows: the larger difference (MV) between the arithmetic mean of the actual output signal value of three strokes and the arithmetic average of the actual output signal value of the three strokes on 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: the rated load is added without impact in 5-10 seconds, the reading is read 5-10 seconds after loading, and then the output value is recorded successively according to a certain time interval within 30 minutes. The second is creep recovery: the rated load should be removed as soon as possible (within 5-10 seconds), and the output value should be recorded in turn within 30 minutes according to a certain time interval.
(9) Allowable use temperature: the applicable occasions of this load cell are specified. For example, the normal temperature sensor is generally marked as: - 20 ℃ - + 70 ℃. High temperature sensor Marked as: - 40 ℃ - 250 ℃.
(10) Temperature compensation range: it indicates that the sensor has been compensated in this temperature range during production. The normal temperature sensor is generally marked as - 10 ℃ - + 55 ℃.
(11) Zero point temperature effect (commonly known as zero temperature drift): characterizes the stability of zero point of this sensor when the ambient temperature changes. Generally, the unit of measurement is the drift produced in the range of 10 ℃.
(12) Temperature effect of output sensitivity coefficient (commonly known as coefficient temperature drift): this parameter represents the stability of output sensitivity of the sensor when the ambient temperature changes. Generally, the unit of measurement is the drift produced in the range of 10 ℃.