Sensors in Automation

Question 1

Contact Sensor

Answer 1

Low cost

Short life, requires maintenance

Question 2

Non-Contact Sensor

Answer 2

Non-Optical

Inductive
lONG LIFE, LOW MAINTENANCE
Only works with non-ferrous

Capacitative
Works with non-ferrous
Does not work with ferrous

Optical

Through Beam
Long Range
Double-headed unit requires additional cabling, regular maintenance

Retro reflective
Medium range, reduced cabling
Requires a reflector

Diffused
No reflector required
Short range, surface finish affects performance