A weighing instrument, also called a weighing display control instrument, is an electronic device that converts the signal from a weighing sensor (or through a weight transmitter) into a digital display of weight, and can store, count, and print weight data. It is commonly used in industrial applications. Automated batching and weighing in agricultural production to improve production efficiency. Humidity sensor probe, stainless steel electric heating tube PT100 sensor, cast aluminum heater, heating ring, fluid solenoid valve.

A weighing instrument, also called a weighing display control instrument, is an electronic device that converts the signal from a weighing sensor (or through a weight transmitter) into a digital display of weight, and can store, count, and print weight data. It is commonly used in industrial applications. Automated batching and weighing in agricultural production to improve production efficiency. Humidity sensor probe, stainless steel electric heating tube PT100 sensor, cast aluminum heater, heating ring, fluid solenoid valve.

The performance indicators of weighing instruments used in industrial enterprises are usually described in terms of cost (also known as accuracy), variation, and sensitivity. Instrument workers usually calibrate instruments in three categories: adjustment, variation and acuity.

1. Variation refers to the maximum difference between the instrument indication values when the measured variable of the weighing instrument (which can be understood as the input signal) reaches the same value from different directions multiple times. In other words, the instrument is in an environment where the external conditions are stable. , the extent to which the measured parameter changes from small to large (forward characteristic) and the measured parameter changes from large to small (reverse characteristic) is not uniform. The difference between the two is the instrument variation. Reliability Weighing control instrument reliability is another important performance indicator pursued by instrument engineers in chemical companies. Reliability and instrument maintenance are mutually reinforcing. High instrument reliability means low instrument maintenance. On the contrary, poor instrument reliability means large instrument maintenance. For chemical enterprise testing and process control instruments, most of them are installed on process pipelines, various towers, kettles, tanks, and vessels.

2. The stability of the weighing instrument in the load cell. Within the specified working conditions, the ability of certain functions of the weighing instrument to remain stable over time is called stability (degree). Instrument stability is a daily performance indicator that instrument engineers in chemical companies are very concerned about. Since the environment where instruments are used in chemical companies is relatively harsh, and the temperature and pressure of the medium being measured change relatively large, if instruments are put into use in this environment, the ability of some parts of the instrument to remain stable over time will decrease. The stability will decrease. There is no quantitative value to indicate the stability of the instrument. Chemical companies usually use zero drift of the instrument to measure the stability of the instrument. The stability of a weighing instrument is directly related to the application scope of the instrument, and sometimes directly affects chemical production. The impact caused by poor stability often has a greater impact on chemical production due to the decrease in accuracy of a pair of instruments. Instruments with poor stability require a lot of maintenance, which is the last thing that instrument workers want to happen.

3. The sensitivity of a weighing instrument is sometimes called the "amplification ratio", which is also the slope of each point on the line that corresponds to the static characteristics of the instrument. Increasing the amplification factor can improve the sensitivity of the instrument. Simply increasing the sensitivity does not change the basic performance of the instrument, that is, the accuracy of the weighing instrument is not improved. On the contrary, oscillation will occasionally occur, causing the output to be unstable. Instrument sensitivity should be maintained at an appropriate level.

For most customers, although instrument accuracy is an important indicator, in actual use, more emphasis is placed on the stability and reliability of the instrument, because only a small number of testing and process control instruments are used for measurement in chemical companies, while a large number of instruments are used for measurement. is used for detection. In addition, the stability and reliability of detection instruments used in process control systems are more important than accuracy.

With the upgrading of instruments, especially the introduction of microelectronics technology into the weighing instrument manufacturing industry, the reportability of instruments has been greatly improved. Instrument manufacturers are paying more and more attention to today's performance indicators, and usually use the mean time between failures (MTBF) to describe the reliability of the instrument. The MTBF of a fully intelligent weighing transmitter is about 10 times higher than that of ordinary non-intelligent instruments such as electric III transmitters. The weighing instrument must be digitally calibrated with the load cell before use. Calibration actually means calibrating the scale using standard weights. The calibrated instrument internally stores the calibration coefficients relative to this group of sensors. With this coefficient, the instrument can convert the analog signal of the load cell into a digital display of weight.