Load cell specific description
The load cell is actually a quality signal into a measurable electrical signal output device. Weighing sensors with sensor should be first to consider the actual working environment in which the sensor, this point is crucial for the correct selection of the load sensor, it is related to whether the normal work of the sensor as well as its safety and service life, even the whole reliable weighing and security. On the basic concept and evaluation methods weighing sensor main technical indicators, new and old GB qualitative differences. There are S-type, cantilever type, Spoke, plate ring, bellows, bridge, column drum, such as several styles.
Old GB will use objects and use a completely different environmental conditions "weighing" and "force" two sensors into one to consider, test and evaluation methods did not give distinction. Old GB total of 21 indicators were tested at room temperature; and with the non-linearity, hysteresis error, repeatability error, creep, zero additional temperature error and the rated output additional temperature error six indicators of maximum error, to determine the weighing sensor accuracy class, are represented by 0.02,0.03,0.05. A force sensor used on the instrument. It will act on the object's gravity by a certain percentage into an output signal can be measured. Taking into account the impact of the acceleration of gravity and air buoyancy on the conversion of different point of use, and performance load cells are mainly linearity error, hysteresis error, repeatability error, creep, zero temperature characteristics and sensitivity temperature characteristics. In a variety of scales and quality measurement system, usually brings a comprehensive control sensor accuracy with the integrated error, and contact with the instrument integrated error error band (Fig. 1) up to the selection corresponding to a certain accuracy weighing scales sensor. International Organization of Legal Metrology (OIML) provides that the sensor error band instrument error δ with Δ accounted for 70% of the weighing sensor linearity error, hysteresis error and error or the like within the specified temperature range due to the effect of temperature on sensitivity caused sum can not exceed the error band δ. This allows the manufacturer to the respective components constituting the total measurement error is adjusted to obtain the desired degree of accuracy