Load cell specific classification

In fact, the classification of the load cell is a lot of ways for each application and production technology are not the same, what is the load cell specific classification . Photoelectric sensors include two kinds of grating and the code disc . Grating Car Sensors  moire grating formed into the angular displacement of the optical signal. Two gratings , one for the fixed grating and the other is mounted on the shaft dial movement grating. Added to the load-bearing stage analyte through force transmission lever system so that the dial shaft rotation , led moving grating rotation, so that it moves with moire . Using photoelectric conversion circuit, and tables , can calculate the number of moves over the moire , measuring the rotation angle of the size of the grating , so as to determine and read out the measured physical quantity . Code disc Cooling Temperature Sensor code disk ( sign board ) is mounted on a shaft of transparent glass dial , above a certain coding method with the scheduled black and white code. Added to the load-bearing platform of the test object by the force transmission lever dial shaft is rotated, the code plate is rotated along with a certain angle . Photocell for receiving light through the code wheel and converted into an electrical signal , and the digital processing circuit , and finally displayed on the monitor represents the measured quality digital . Photoelectric sensors have been mainly used in the mechanical and electrical integration scales . Hydraulic gravity Car Temperature Sensor P-action by the measured object , the hydraulic pressure of the oil increases, the increase is proportional to the degree of P . Increasing pressure measured value , you can determine the quality of the measured object . Hydraulic pressure sensor structure is simple and strong , wide measurement range , but the accuracy is generally not more than 1 /100. Electromagnetic force sensor
It utilizes the load bearing platform with electromagnetic force equilibrium principle. When the load measured object placed on stage , the upwardly inclined end of the lever ; photovoltaic element detected inclination signal is amplified and flows into the coil , electromagnetic force , the lever returns to equilibrium. Counterweight against the currents generate electromagnetic digitizer , you can determine the quality of the measured object . Electromagnetic force Crankshaft Positioning Sensor accuracy, up to 1/ 2000 to 1/ 60000 , but only in the range of tens of milligrams weighing 10 kg. Capacitive sensor which utilizes frequency oscillation circuit capacitor and the electrode distance d, f proportional relations . There are two plates , one fixed and the other one movable . Loading the loading station when the measured object , the leaf spring deflection , the distance between the two plates changes, the oscillation frequency of the circuit also changes . The measured change in frequency measured can be calculated the mass of the load stage . Capacitive sensors less power consumption , low cost , accuracy of 1/200 to 1/ 500 . Variable magnetic Crankshaft Sensor Replacement ferromagnetic element in the form of analyte mechanical deformation under the action of gravity , the internal stress and cause changes in permeability , so that around the ferromagnetic element ( pole ) of the secondary side also changes the induced voltage . The change in the measured voltage can be calculated the force applied to the pole , and to determine the quality of the measured object . Pole change form sensor accuracy is not high , usually 1 /100, applicable to large -tonnage weighing , weighing range of tens to tens of thousands of kilograms .