The tube is filled with an inert gas ie nitrogen

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: KG • FP 1110 3. Magnetic proximity sensors 3.1 Reed proximity sensors 3.1.1 Function description Magnetic proximity sensors react to the magnetic fields of permanent magnets and electro magnets. In the case of a reed sensor, contact blades made of ferromagnetic material (Fe-Ni alloy, Fe = iron, Ni = nickel) are sealed in a small glass tube. The tube is filled with an inert gas i.e. nitrogen (inert gas meaning a non active, non combustible gas). S Fig. 3.1.1: Magnetic reed proximity sensors If a magnetic field approaches the reed proximity sensor, the blades are drawn together by magnetism, and an electrical contact is made. © Festo Didactic GmbH & Co. KG • FP 1110 35 3. Magnetic proximity sensors 3.1.2 Technical characteristics The table below lists some of the most important technical data relating to contacting proximity sensors. Parameter Value Switching voltage 12 – 27 V DC or AC Switching accuracy ±0.1 mm Maximum contact rating 40 W Maximum magnetic interference induction 0.16 mT Maximum switching current 2A Maximum switching frequency 500 Hz Switching time ≤2 ms Conduc...
View Full Document

This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.

Ask a homework question - tutors are online