

The weighing module is elastically deformed under the action of external force, so that the resistance strain gauge attached to its surface is also deformed. After the deformation of the resistance strain gauge, the resistance value will change, and then this positive change will be converted into voltage by the corresponding measuring circuit, thus completing the process of converting external force into electrical signal. Among them, the resistance strain gauge is a strain gauge by mechanically distributing an electric limiting wire on a substrate made of organic materials.

The analog signal of weighing module is converted into digital signal by high-speed A/D conversion module, and then the digital signal is transmitted to PLC by high-speed A/D through RS485 communication, and PLC processes the data and controls field devices such as valves and motors. In addition, it is connected to the touch screen HMD through the expansion port. Through the touch screen, the system process flow can be displayed, all parameters can be viewed, the real-time running status of the system can be monitored, the historical trend can be viewed, and the recipe can be accessed and called.
The measuring module adopts cantilever beam type weighing sensor, and the elastic body is a curved cantilever beam structure, which has low profile height and high structural strength. It is used for measuring tensile force or compressive force, and has strong anti-deflection and anti-lateral force, dust-proof and sealing, high precision, stable and reliable performance and convenient installation and use.
The weighing module is elastically deformed under the action of external force, so that the resistance strain gauge attached to its surface is also deformed. After the deformation of the resistance strain gauge, the resistance value will change, and then this positive change will be converted into voltage by the corresponding measuring circuit, thus completing the process of converting external force into electrical signal. Among them, the resistance strain gauge is a strain gauge by mechanically distributing an electric limiting wire on a substrate made of organic materials. Elastomer is a structural member with a special shape.
The output of weighing module is a weak signal of mV level. The traditional measurement method is to add a high-precision amplifier before A/D conversion, and the circuit is complicated. It has a complete analog front end, which can directly measure the weak DC signal output by the sensor, and the conversion accuracy reaches 24-bit error-free code. The three-wire serial port is used to connect with the microcontroller, and the gain, signal polarity and input channel can be set through software programming. It has the functions of self-calibration, system calibration and background calibration, and can eliminate the influence of zero error, full-scale error and temperature drift.
technical parameter
Accuracy grade: 0.02%
Rated range (kg): 110, 220, 550, 1100, 1760.
Sensitivity (mV/V): 1.94
Sensitivity error range (%): 0.1000
Effect of temperature on sensitivity (%of cn/10k): 0.0140.
Influence of temperature on zero point (%of cn/10k): 0.0140
Nonlinear error (%of Cn):±0.0170
Lag error (%of Cn): ±0.0170
Creep and creep recovery for 30min s (%/30min): 0.0166.
Zero point balance (MV/V): 0 0.01
Input resistance (ω): 400 50
Output resistance (ω): 350 0.12
Reference voltage (V):5
Maximum working voltage (V): 5 ... 15
Insulation resistance (Gω/100 V): > 5
Rated temperature range (℃):-10 ~+40
Working temperature range (℃):-30 ~+70.
Storage temperature range (℃):-50 ~+85.
Safe bearer (%of Emax):150
Ultimate bearing capacity (%of Emax):100
Rated load Emax(% of Emax):300
Allowable dynamic load (%of Emax):70
Maximum load deformation (mm):0.5
Weight (kg):0.9
Protection grade: P68