A capacitive sensor can detect an element affected by the electrostatic field, which means, it identifies the changes in materials due to the electrostatic field.

A capacitive sensor operates remotely.

Before choosing a capacitive sensor, you must consider several factors:

• the sensor range, that is to say, the distance to which it can detect the object,
• the voltage supply,
• the contact type (NO or NC) and the maximum power supply passing through the dry contact,
  Caution, if the contact maximum current is not enough, you must consider using a relay.

• the connection type, either
  • a PNP connection switched positive,
  •  or a NPN connection switched negative, and,

• the size and shape, either
  • cylindrical capacitive,
  • button capacitive.