Proximity Sensors

ENGR 363

Proximity sensors uses physical contact to detect objects.

False

Hysteresis is also called _____ which is the difference between the operating and release points of the device.

differential travel

A(n) _____ proximity sensor can detect both metallic and non-metallic objects

capacitive

The standard target for an inductive proximity sensor is constructed of _____ measuring 1mm thick and with sides equal to the active face of the device.

mild steel

An Inductive proximity sensor uses a(n) _____ field to detect the presence of objects.

electromagnetic

Proximity sensors use reflected light to detect objects.

False

The _____ proximity sensor allows the electromagnetic field to be concentrated to the front of the sensor face which allows the sensor to be flush mounted in surrounding metal. A(n) _____ proximity sensor will trigger if mounted directly in a metal surface.

shielded

unshielded

What type of sensing field does a capacitive proximity sensor use? This field is generated by an oscillator when the target comes within range of the sensor.

electrostatic

Capacitive proximity sensors use correction factors for various targets based on the _____ of the material. A number greater than 1.2 can be detected with higher numbers being easier to detect.

dielectric constant

A _____ well is an area in a surface void of materials that would falsely trigger a(n) _____ proximity sensor. The size of this void is defined by the manufacturer.

sensor

un-shielded

The _____ frequency is the maximum speed at which a sensor will deliver discrete individual pulses as the target enters and leaves the sensing field. This value is always dependent on target size, distance from sensing face, speed of target and switch type.

switching

Capacitive proximity sensors can detect which of the following:

Ferrous

Non-Ferrous

Metallic

Non-metallic

liquids

The human body

Control Relay

E

Proximity Sensor

I

Limit Switch N.C.

B

Solenoid

F

Flow Switch

H

Normally Open Pushbutton

A

Float Switch

A

Temperature Switch

C

Photoelectric Sensor

D