The difference between proximity switch and thermocouple sensor

There are different kinds of thermocouple sensor. And several close to switch, thermocouple sensor is general, close to switch is a category of thermocouple sensor. , '

thermocouple 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'. Thermocouple 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. The classification of the thermocouple sensor: the thermocouple sensor

not at present a unified classification method, which are frequently used but has the following three kinds:

1, according to the classification of physical measurement of thermocouple sensor, can be divided into the displacement and force, speed, temperature, flow rate and gas composition, such as thermocouple sensor

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

3, according to the features of the thermocouple 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 thermocouple sensor; Output to simulate type thermocouple sensor; The output pulse or code of digital type thermocouple sensor.

about the classification of the thermocouple sensor:

1. According to the working mechanism of thermocouple sensor points:

( 1) Structured: such as: inductive and capacitive thermocouple sensor, etc. ;

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

2. According to the thermocouple sensor output signal in the form of points:

( 1) Analog: thermocouple sensor for analog voltage output;

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

3. According to the quantity being measured points: such as: force, stress, displacement, temperature, Angle of thermocouple sensor, etc. ;

4. According to the working principle of thermocouple sensor points: such as: strain thermocouple sensor, piezoelectric thermocouple sensor, voltage resistance thermocouple sensors, inductive thermocouple sensor, capacitance type thermocouple sensor, photoelectric thermocouple sensor, etc. ;

5. According to the thermocouple sensor to convert energy way points:

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

( 2) Power control type: such as: resistive, inductive and hole type thermocouple sensors and thermistors, photosensitive resistance, humidity sensitive resistor and so on;

in all kinds of thermocouple sensor, a kind of close to its object with the ability to 'sense' components: displacement thermocouple sensor. Don't need to come into contact with this kind of thermocouple sensor is detected objects, when there are objects move to the displacement of the thermocouple sensor, and close to a certain distance, the displacement of the thermocouple sensor is the 'perception', usually called the distance 'detection distance'. Using displacement thermocouple sensor sensitive characteristics of objects close to switch, is close to the switch. Because the displacement of the thermocouple sensors can be according to the principle of different and different methods, and different displacement thermocouple 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. ) 。