Photoelectric sensor is a commonly used sensors, is widely used in many industries. Users in the use of these knowledge are required to understand, which for the photoelectric sensor blind zone, detection distance, the difference between the distance, the response frequency and other professional terms for the use of the user is very important, the following to introduce a specific photoelectric sensor terminology it.

(1) Detection distance:

It refers to the detection of the body moved in a certain way, from the reference position (photoelectric sensor sensing surface) to the sensor action measured at the reference position to the detection surface of the spatial distance. Rated action distance refers to the nominal value of the sensor action distance.

(2) Return distance:

It is the distance difference between the action distance and the return distance.

(3) Response frequency:

Is the number of times the photoelectric sensor action cycle is allowed to occur within a specified time interval of 1 second. br / Response time.

(4) Output state:

It refers to the sub-normally open and normally closed. When there is no detection of the object, normally open photoelectric sensor connected to the load, due to the photoelectric sensor internal output transistor cut-off and does not work, when the object is detected, the transistor conduction, the load is electrified to work.

(5) Detection mode:

It means that according to the photoelectric sensor in the detection of the object, the light emitted by the transmitter is refracted back to the receiver of the path of the different, can be divided into diffuse reflection type, mirror reflection type, counter-reflective type and so on.

(6) Output form:

Is divided into NPN two-wire, NPN three-wire, NPN four-wire, PNP two-wire, PNP three-wire, PNP four-wire, AC two-wire, AC five-wire (self-contained), and DC NPN/PNP/normally open/normally closed multi-functional multiple commonly used forms of output.

(7) pointing angle:

Is the common photoelectric sensor pointing angle schematic.

(8) Surface reflectivity:

Is for diffuse reflection photoelectric sensor issued by the light needs to be detected by the surface of the object will be enough light reflected back to the diffuse reflection sensor receiver, where the detection distance and the surface reflectivity of the detected object will be to determine the size of the intensity of the light received by the receiver, rough surfaces will be reflected back to the light will be less than the intensity of the smooth surface reflected back, and, the surface of the detected object must be perpendicular to the photoelectric sensor's emitted light.

(9) Environmental characteristics:

Refers to the photoelectric sensor application of the environment is also an important condition that affects the long-term reliability of its work.