Cut Sheet

V8-T4-2 Volume 8—Sensing Solutions CA08100010E—February 2015 www.eaton.com
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4.0
Capacitive Proximity Sensors
Introduction
Technical Reference
Capacitive Proximity Sensors
Capacitive proximity sensors are designed to detect
both metallic and nonmetallic targets. They are ideally
suited for liquid level control and for sensing powdered or
granulated material.
Strengths and Weaknesses
Consider these strengths and weaknesses of the capacitive
proximity sensor:
Capacitive Proximity Sensor Attributes
Attributes
Strengths
Can detect both metallic and nonmetallic objects at greater ranges than inductive sensors
High switching rate for rapid response applications (counting)
Can detect liquid targets through non-metallic barriers (glass, plastic)
Long operation life, solid-state output for “bounce free” signals
Weaknesses
Affected by varying temperature, humidity and moisture conditions
Not as accurate as inductive proximity sensors
Applications
Here are some examples showing how the detection power of
capacitive proximity sensors is used:
●
Liquid level detection
applications, such as
preventing overfilling or
underfilling, are common in
the packaging industry
●
Material level control
applications, such as
assuring that a sleeve of
labels on a labeling line is
not empty
●
Counting applications,
such as tracking units
passing a point on a
conveyor
●
Induction molding
process, detection of level
of plastic pellets in feed
hopper