Electronic measuring system consists of a weight sensor, analog input module. Weight of the sensor signal is sent directly to a programmable logic controller modules, programmed with sensor weight of real-time signal processing and computer displayed in the main flow.

Sensors are also known as the weight transmitter, whose function is to weight pull or pressure signal into an electric signal, sensor working principle figure. Its work of Center parts is resistance strain tablets, dang gravity makes strain tablets by force deformation, its resistance occurred changes, if in resistance bridge of two a incentive Terminal EX+, and EX-plus must of incentive voltage, is because bridge resistance balance of break, will in resistance bridge of two a signal output terminal SG+, and SG-produced potential poor, so gravity signal was conversion into signals (General for voltage signal) from signal end output out.

Are some of the commonly used sensor, common s-type and cylindrical sensors can be installed in tensile and compressive way, cantilever shear beam and the sensor can only be installed to diagram III. Regardless of the installation, weighing should try to avoid non-gravitational forces. Asphalt mixing plant, aggregate scale, powder scales and pitch scale is used in pressure-connection method. Six-wire sensor connection cable signal, respectively, excitation + (green), encouraging-(black), feedback + (yellow), feedback-(blue), signal + (white), signal-(red) and shielded cable. In practice, incentive + (green) and feedback + (yellow) should be connected together, encouraging-(black) and feedback-(blue) connected together, shielded cable for grounding cable. And sensor with connecting cable length cannot be truncated, or otherwise affect its matching resistor.

In the system of asphalt mixing plant, series connection is used, the first sensor output signal anode and the next sensor signal is connected to the cathode, each along the scale of the first sensor signal just positive signal and finally a negative feedback signal of the sensor to the PLC's analog input module. In order to enhance anti-interference ability, the input signal of the sensor cable of the required appraisal, and filter in front of the sensor input signal is installed, the output of the sensor output signal voltage is the voltage, and is in need of attention, some sensor series models and parameters must be the same.