Based on the characteristics of fixed force measurement, the sensor principle structure is selected as a resistance strain force sensor with mature technology and low requirements for the measurement circuit, and the elastomer of one of the key components of the sensor is selected S-beam structure, as shown in Figure 1. When subjected to pressure P, it can be seen from the bending moment diagram of the upper side beam at the center opening of the elastomer that the bending distance along the X direction has a negative to positive change, and the bending moment of the lower side beam at the opening is the opposite.
First of all, in the operation process of the tensile pressure sensor, we will see five indicators linearity, sensitivity, hysteresis, repeatability and drift, linearity depicts the degree of error between the actual function of the sensor input/output and the fitting line, and its value is the ratio of the maximum error between the two to the full-scale output value, and the sensitivity is easy to understand, which refers to the added value of the output value (the ratio of the muscle increment to the added value of the corresponding variable of the added value, which is also an important indicator of the characteristics of the tracing sensor 5. Hysteresis refers to the fact that the repeatability of the two characteristic curves is constant when there is a large to small change in the input, or a small to large change.
The tensile pressure sensor detects the change of its force through a force-sensitive device, and transmits the physical signal of the force through the tensile transmission structure. That is to say, when the elastic deformation of the elastomer occurs, the conversion element of the transmitter is usually an electro-positive strain gauge) He will also produce deformation, and at this moment, the resistance value of the resistance strain gauge will change, convert it into an electrical signal and output it.
Showing the big example of electronic criticism in numbers. Its circuit directional activity consists of this and the letter is a large circuit. The observation circuit can convert the electric positive variable of the electric yang into a large electric music signal, but this signal is a weak electric signal, and it is not necessary to accurately reverse the size of the late change. Through the amplification circuit, it can enlarge and output the digital display panel table.
Generally speaking, pressure sensors are available in two-wire, three-wire, four-wire, and some five-wire systems.
The two-wire system of the pressure sensor is relatively simple, and most customers know how to train. One wire is connected to the positive pole of the power supply, and the other wire is connected to the negative pole of the power supply through the instrument. This is the easiest. The three-wire system of the pressure sensor adds a line to the two-wire system. This wire is directly connected to the negative pole of the power supply, which is a little more cumbersome than a two-wire system.
The four-wire pressure sensor must have two power inputs and the other two signal outputs. The four-wire system is mostly voltage output rather than 4-20mA output, 4-20mA is called the pressure transmitter, and most of the pressure sensor signal output is not amplified in the two-wire system, and the full-scale output is only tens of millivolts.
Some pressure sensors have an internal amplification circuit, and the full-scale output is 0-2V. As for how to accept the display, it depends on the range of the instrument, if there is a suitable output signal gear, it can be measured directly, otherwise you need to add a signal to adjust the circuit, there is little difference between the five-wire pressure sensor and the four-wire pressure sensor, and there are very few five-wire pressure sensors on the market.
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