Main parameters of a load cell:
(1)Rated load: The rated load of the sensor is the maximum axial load that can be measured within the specified specification when designing this sensor. But the actual use, generally only use the rated range of 2/3 to 1/3.
(2)allow the use of load (or safety overload): the sensor allows the maximum axial load to be applied. Allows overload to work within a certain range. Generally 120% to 150%.
(3)limit load (or ultimate overload): the sensor can withstand the maximum axial load without the ability to work. This means that when the work exceeds this value, the sensor will be damaged.
(4) Sensitivity: The ratio of the output increment to the applied load increment. Normally the mV is rated for each input voltage of 1V. The company's products and other products supporting the company, the sensitivity coefficient must be consistent.
(5) Nonlinearity: This is a parameter that characterizes the accuracy of the correspondence between the voltage signal and the load output from this sensor.
(6) Repeatability: repeatability of the sensor in the same load under the same conditions repeatedly applied, the output value can be repeated, this feature is more important, better reflect the quality of the sensor. GB of the repeatability of the statement: repeatability error can be measured with the non-linear. The repeatability error (R) of the sensor is calculated as follows: R = ΔθR / θn × 100%. ΔθR - the maximum difference (mv) between the actual output signal values measured at 3 times on the same test point.
(7) lag: the hysteresis of the popular meaning is: step by step load and then unload the load, the corresponding load of each level, ideally there should be the same reading, but in fact consistent, this inconsistent degree with lag error An indicator. The hysteresis error (H) of the sensor is calculated as follows: H = ΔθH / θn × 100%. ΔθH - the maximum difference (mv) between the arithmetic mean of the actual value of the actual travel signal for the third trip and the arithmetic average of the actual value of the actual travel signal on the third stroke.
(8) creep and creep recovery: the requirements of the sensor from two aspects of the creep error: one is creep: 5-10 seconds without the impact of the rated load, 5 to 10 seconds after the charge Reading, and then in 30 minutes by a certain time interval in turn write down the output value. The sensor creep (CP) is calculated as follows: CP = θ2 - θ3 / θn × 100%. The second is creep recovery: remove the rated load as soon as possible (in 5 to 10 seconds), unloading after 5 to 10 seconds immediately read, and then in 30 minutes by a certain time interval in turn write down the output value. The creep recovery (CR) of the sensor is calculated as follows: CR = θ5 - θ6 / θn × 100%.
(9) allowable use of temperature: the provisions of this sensor can be applied to the occasion. Normal temperature sensor is generally marked as: -20 ℃ --- +70 ℃. High temperature sensor marked: -40 ℃ --- 250 ℃.
(10) Temperature compensation range: This sensor has been compensated in the production of this temperature range. The room temperature sensor is generally labeled as -10 ° C to + 55 ° C.
(11) zero temperature effect (commonly known as zero temperature drift): characterization of this sensor in the ambient temperature changes when its zero stability. The drift in the range of 10 ° C is generally measured in units of units.
(12) Temperature Sensitivity of Output Sensitivity Coefficient: This parameter characterizes the stability of this sensor when the ambient temperature changes. The drift in the range of 10 ° C is generally measured in units of units.
(13) Output impedance: the company's sensors and other manufacturers in parallel with the sensor, you must understand the company's product output impedance, this value must be consistent with it, otherwise it will directly affect the output characteristics of electronic scales and four corner error debugging.
(14) Input impedance: The input resistance of the sensor is greater than the output resistance due to the offset compensation resistor and the sensitivity coefficient of the input of the sensor. However, it can be changed by the parallel resistance method. Requires the input impedance of the sensor is consistent, if the sensor with other manufacturers match. The input impedance should be consistent with the input impedance, otherwise the quadrant error in the debugging will increase the working hours, because the input impedance of the sensor is a load on the power supply, only the same load, the same power supply will provide the same power supply voltage.
(15) Insulation resistance: Insulation resistance is equivalent to the sensor bridge and the ground between a string of resistance and its equivalent resistance, the size of the insulation resistance will affect the performance of the sensor. And when the insulation resistance is lower than a certain value, the bridge will not work properly.
(16) Recommended excitation voltage: generally 5 to 10 volts. Due to the general weighing instrument with the regulator power supply is 5 or 10 volts.
(17) to allow maximum excitation voltage: In order to improve the output signal, in some cases (such as large tare) requires the use of increased excitation voltage to obtain a larger signal.
(18) Cable length: it is related to the layout of the site, before ordering must see the company's product conventional cable length. In addition, pay attention to whether the environment is corrosive, whether the impact of the situation, whether high temperature or low temperature.
(19) Seal Protection class IP67: Anti-flooding effect, immersed in water at specified pressure and time Performance is not affected. The glue protection sensor can reach IP67. In addition to oil, waterproof, but also to prevent the general corrosive gases, corrosive media.
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