Weighing instruments use load cells (can be mechanical strain gauge or stress type, or even composite) to detect the weight, generally are three-point or four-point sensors, using ratio type A/D conversion and frequency doubling technology, measurement performance in the long term stability is good. The software can truly simulate the vibration, empty scale change, material fall and other weighing characteristics, display fast, accurate and stable. There is an empty scale zero, zero tracking, calibration, weighing, indexing and other parameters of the setting unit, easy to change the strong versatility. With output interface, it can be connected to a variety of external devices to realize system control conveniently.

Weighing Instrument converts the load cell signal into weight digital display, and can store, count and print the weight data. It is commonly used for automated batching and weighing in industrial and agricultural production to improve production efficiency, and is a typical secondary instrument. It is a typical secondary instrument. Weighing instruments are mainly used for the display of weight figures in weighing systems, such as the display of load carrying capacity in bridges, roads and transportation projects, and the display of dosage measurement in chemical industry.

The main function of weighing instrument is to measure the mass of the weighed object on the scale through the load cell and convert it into a digital signal for display. With the progress of microelectronics technology, weighing instruments have been developed rapidly, and are now mostly digital weighing instruments. It not only can be weighed quickly and accurately into a simple and easy to read digital form, but also to complete the zero, zero tracking, tare, self-test, calibration and other control functions.

Weighing instrument refers to an electronic weighing instrument that displays the mass and weighing state of the object. It is composed of error amplifier, reversible motor, balance bridge, excitation power supply, dial and pointer, etc. It adopts measuring amplifier structure to accept and amplify the signal of weighing sensor. Magnification is usually hundreds of times. The filter unit filters out electrical noise from outside the machine and generated by the amplifier itself. A/D conversion unit converts analog to digital, and the transposition number is usually more than 14 bits of binary number. The data processing unit is composed of microprocessor as the core and peripheral support chip, which completes a series of operations such as data acquisition, operation and storage under the control of program, and the processing results are sent to the corresponding interface.

The instrument is composed of a power supply circuit, a weighing signal acquisition circuit, a microcontroller peripheral circuit, an LED display module, a communication interface circuit, a switching keypad and an external memory. It supports various human-machine dialog modes such as network interface, USB interface, RS232, touch screen, etc. The weighing instrument is RS485 interface communication mode, and it adopts DC5V power supply through USB socket, and it can be powered by commercially available adapter or rechargeable treasure.

Weighing module is a new weighing unit which combines weighing sensor, load transmission device and installation connection device. It is not affected by installation conditions and environment. While ensuring the stability and accuracy of the sensor, it can avoid the risk of weighing errors caused by installation. Weighing module has gradually developed into network informatization, which has brought more convenience to human society and gradually integrated into modern life. It has the functions of data management, data processing and data operation.

The weighing module amplifies the weak analog signal output by the sensor by a certain multiple to meet the requirements of the A/D converter for the input signal level. The function of A/D conversion is to convert analog signals into digital signals, carry out analog-to-digital conversion, then send the digital signals to the display circuit, and finally display the measurement results by the display circuit.

The weighing module completes the storage of sampling data, interrupts the service, completes the scanning, determines the number keys or function keys, and sends data to the data buffer and the display buffer when the number is digital. The output voltage signal is accumulated through the junction box and transmitted to the weighing instrument, which displays the material weight in the current weighing (reaction tank) in real time through A/D conversion. Print metering data in real time, save historical data records, and allow users to monitor the working state of the reaction tank and find historical data.

The weighing module thus overcomes many shortcomings of traditional analog signals, such as easy interference and attenuation, and greatly improves the reliability of the weighing system. Weighing module has become a necessary device in process control, which has been applied to almost all weighing fields, from the weight measurement of large storage tanks and hoppers and the control of cranes to the mixed distribution, automatic detection in production process and the control of powder feed.