Today,we will share 4 steps to select proximity sensors.
On the surface, the proximity sensor looks run-of-mill, but there is hidden wonder here. They are extremely vital to enhance the reliability and stability of the equipment provided that it is selected well and correctly. To select a proximity sensor, there are many aspects should be taken consideration. It particularly depends on the customer's requirements and applications. Generally we should take the following factors into consideration：
1. Materials of detected objects
First,confirm the materials of the detected objects. If it is metal, both capacitive and inductive sensors are suitable, while capacitive sensors fits well for non-metallic materials.
2. Effect of materials on detection distance
Before selecting a sensor with a suitable range, we have to pay attention to the impact of detected materials on sensing distance. For instance, we need to think about the material attenuation factor for inductive sensors. While for capacitive ones,we need to take the impact of the dielectric constant of the material into consideration.
Inductive Attenuation Coefficient
Detection Distance = Standard Detection Distance * Attenuation Factor
3. Other factors
Other factors, such as choosing the right housing and size of sensor according to the actual applications, are commonly as follow:
① Housing: round type, square type, slot type.
② Detected objects: iron, steel, copper, aluminum, plastic, water, paper, etc.
③ Power: DC, AC, AC/DC for general purpose.
④ Output: normally open (NO), normally close (NC).
⑤ Output: two-wire, three-wire (NPN, PNP).
⑥Installation mode: shielded, unshielded.
⑦ Wiring: pre-wired type, connector type, plug-in relay type.
⑧ Response frequency: several objects need to be detected in one second
4. Special Requirements
For special applications, special types should be considered. Like ring type, high temperature type, level detection type and corrosion-resistant type, etc.