The difference between proximity switch and sensor

There are different kinds of sensors and proximity switch, sensor is general, proximity switch is a category in the sensor. , '

sensor can feel the provisions is measured and converted into usable signal device according to certain rules or device, usually by sensitive components and conversion components'. Sensor is a kind of testing device, can feel the measured information, and can detect feel the information, will change according to certain rule become electrical signal output, or other form of information needed to satisfy the information transmission, processing, storage, display, record and control requirements. It is the first step of automatic detection and automatic control. Classification of sensors:

the current classification method of sensor is a unified, but more commonly used include the following three kinds:

1, according to the classification of physical measurement of sensor, can be divided into the displacement and force, speed, temperature, flow, components of the gas sensor

2, according to the working principle of the sensor classification, can be divided into the resistor, capacitor, inductor, the voltage, hall, photoelectric, grating, such as thermocouple sensor.

3, according to the features of the sensor output signal and the classification, the output for the switch quantity can be divided into: ( '1' and '0' or 'on' and 'off') The switch type sensor; Output to simulate type sensor; Digital type sensor output pulse or code.

about the classification of the sensors:

1 according to the working mechanism of the sensor points:

( 1) Structured: such as: inductive, capacitive sensors, etc. ;

( 2) Property type: such as piezoelectric, photoelectric, all kinds of semiconductor sensor, etc. ;

2 according to the sensor output signal in the form of points:

( 1) Analog: sensor for analog voltage output;

( 2) Digital: sensors for the digital output, such as: the encoder sensor.

3 according to the measured quantities, such as: force, stress, displacement, temperature, Angle sensors, etc. ;

4 according to the working principle of sensor points: such as: resistance strain sensor, piezoelectric sensor, pressure sensor, inductive sensors, capacitive sensors, photoelectric sensors, etc. ;

5 according to the sensor to convert energy way points:

( 1) Energy conversion type, such as piezoelectric, thermocouple, photoelectric sensors, etc. ;

( 2) Power control type: such as: resistive, inductive, hall sensor and thermal resistor, such as photosensitive resistance, humidity sensitive resistor, etc;

in all kinds of sensors, there is a kind of 'perception' ability to close to its object components: displacement sensor. Don't need to come into contact with this kind of sensor is detected objects, when there are objects move to the displacement sensor, and close to a certain distance, displacement sensor has the 'perception', usually called the distance 'detection distance'. Using displacement sensor is sensitive to near the object features switch, is close to the switch. Because displacement sensor can be according to the principle of different and different methods, and different displacement sensor method of 'perception' of the object is different also, so common proximity switch has the following kinds: 1, eddy current type proximity switch ( Inductive proximity switch) 2, capacitive proximity switch 3, hall close to switches, photoelectric proximity switch 5, 4 pyroelectric type proximity switch 6, and other types of proximity switch ( Ultrasonic proximity switch, microwave, close to switch, etc. ) 。