All kinds of sensors in PLC control system and instructions

There are many different kinds of sensors and different function. Due to the same principle of different transformation can be measured to achieve detection, using the same laws of physics, chemistry or biology effect can design produce testing different measuring sensor, and function the same of the same kind of sensor can be used in different areas of technology, so the sensor has a different classification. The specific classification are shown in table 1. Table 1 category classification type of sensor according to the classification on the basis of the effect of physical sensors chemical sensors biosensors based on physical effects ( Light, electricity, sound, magnetism, heat) Based on the chemical effect ( Adsorption and selective chemical analysis) Based on the biological effects ( Enzymes, antibodies, hormones and other molecular recognition and selection function) Is according to the use field of the law or the laws of using material classification of property type sensor is sensitive to through structured sensor geometric structure parameters to realize information transfer through sensitive element material physical properties changes in the information transformation according to the working principle of the classification of strain type, capacitance and inductance, magnetic, piezoelectric, named after the working principle of thermoelectric sensors sensors according to the classification of input displacement, velocity, temperature, pressure, gas composition, the concentration of sensors, sensor named after is measured by the output signal classification digital sensor output analog sensor for the relationship between energy and analog to digital output according to the classification of energy conversion type sensor energy control type sensor will be measured directly into the output of energy supplied by external sensors, and controlled by the measured output energy according to whether or not depend on plus power classification of active sensors work need to be passive sensors and power sensors work without additional power supply by using semiconductor sensitive material classification sensor, optical fiber sensors, ceramic sensors, sensors, polymer sensors, metal composite materials sensor such as sensor named after the use of sensitive materials