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Load cell work process & Instrument application
Load cell work process
During the measurement process, the weight is loaded onto the elastomer of the weighing sensor, causing deformation.The strain (forward and negative) is converted to an electronic signal by a strain gage mounted on the elastomer.
Weighing instrument also called weighing display control instrument, is to convert the weighing sensor signal (or again through the weight transmitter) to the weight digital display, and the weight data can be stored, statistics, printing of electronic equipment, often used in industrial and agricultural production of automatic ingredients, weighing, to improve production efficiency.
The performance index of weighing instrument used in industrial enterprises is usually based on accuracy (also called precision), variation and acuity. Instrumentation calibration instrumentation is usually the accuracy of adjustment, variation and acuity of three items.
Variance is the weighing instrument measured variable (can be understood as the input signal) multiple times from the difference bias to the same value, the maximum difference between the indicator values of the instrument, presumably, is the degree to which the measured parameters are not uniform, from small to large changes (forward characteristics) and measured parameters from large to small transformations (reverse characteristics), in environments where the external conditions are stable. The difference between the two is the instrument variation. Reliability weighing control instrument reliability is another tension performance index which is sought by the instrument workers in chemical industry. Reliability and instrument maintenance are complementary, the instrument reliability is high, the instrument maintenance is small, the instrument reliability is poor, the instrument maintenance quantity is big. To deal with chemical enterprise detection and Process Control instrumentation, large departments in the process pipeline, all kinds of towers, pots, cans, equipment.
Weighing instrument in weighing sensor stability in the delineation of conditions, weighing instrument some of the performance over time to maintain a solid ability called stability (degree). Instrumentation stability is a very considerate day performance indicators for chemical industry. Because the chemical enterprise uses the instrument environment to compare the bad, the measured medium temperature, the pressure change also is compared to the power, in this environment puts in the instrument utilization, the instrument certain parts with the time link solid ability will be low, the instrument stability will descend. By or characterize the stability of the instrument has no quantitative value, chemical enterprises usually use the instrument 0 drift to measure the stability of the instrument. Weighing instrument stability of the pros and cons directly involved in the use of the scope of the instrument, accidental direct impact of chemical production, the stability of the impact of the two-instrument precision landing on the impact of chemical production is also greater. The stability of the instrument maintenance is not good, is the most do not look forward to the appearance of the work.
Weighing instrument is also known as the sensitivity of the "magnification ratio", but also the static characteristics of the instrument line on the slope of the points. Increase in magnification can increase the sensitivity of the instrument, simply increase the sensitivity does not change the base-day performance of the instrument, that is, weighing instrument accuracy has not improved, on the contrary, occasionally appear oscillation signs, resulting in unstable output. Instrument acuity should be connected to the appropriate amount.
For most customers, instrument accuracy is a tension index, but in actual use, often more emphasis on the stability and reliability of the instrument, because the chemical enterprise detection and Process Control instrumentation for a small number of measurement, and a lot of it is used for testing. Otherwise, the stability and reliability of the instrumentation in the Process Control system are more tense than the precision.
With the upgrading of instrumentation, especially the introduction of microelectronic skills in weighing instrument manufacturing industry, so that the instrument can be greatly improved. Instrumentation manufacturers are also increasingly valued for this day's performance indicators, usually with the average no obstruction time MTBF to shape the reliability of the instrument. The MTBF ratio of a fully intelligent weighing transmitter is about 10 times times higher than the usual intelligent instrument such as electric Ⅲ transmitter. Weighing instrument before use and weighing sensor supporting digital calibration. Calibration is actually used to calibrate the weighing apparatus with standard weights. The calibration coefficients of this set of sensors are stored inside the calibrated instrument. With this coefficient, the instrument can turn the analog signal of the weighing sensor into a weight digital display.
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