Limit switches and proximity controls (unit 13)

most microswitches require a movement of approximately(------)to change the contact position.

0.38 mm

pancake type solid state sensors are designed to detect targets at distances up to(------------)

4.0 in

some reflector units have a range of 2 feet or more.

False

capacitive proximity sensors are designed to detect only metallic targets.

false

(-------------) are fast acting and often used to measure the speed of rotating objects.

hall effect sensors

(------)used in burglar alarm systems commonly used infrared LEDs as the light source.

photodetectors

Contacts must be selected according to the proper load.

true

inductive proximity switches operate on the eddy current principle.

true

limit switches may be momentary contacts or maintaining contact types.

true

The(-----)emits a high-frequency sound wave and then detects the echo when it bounces off the object.

ultrasonic detector