All applications have
certain specific needs, but, in general, the following steps will help you
choose the correct sensor for your application:
The sensing distance
is the distance between the tip of the sensor and the object to be sensed. The
selection guide and the specifications table for each sensor family lists the
A. In many applications,
it is beneficial to place the sensor as far as possible from the sensing object
due to temperature concerns. If a sensor is placed too close to a hot
temperature source, the sensor will fail quicker and require more maintenance.
Greater distance may
be achieved with extended and triple range sensors. In many applications, a
sensor may not be mountable close to the sensed object. In this case, longer
sensing distances are needed. Extended sensing distance sensors are offered in
8mm to 30mm dimeters, and triple sensing distance sensors in 8mm and 12mm
In many cases, using an extended distance sensor to get the
sensor farther away from the detected object can be beneficial to the life of
the sensor. For example, without an extended distance sensor you may not be
able to place the sensor close enough to the detectable object, or you may need
to buy more expensive high temperature sensors.
Another example would
be a mechanical overshoot situation, where mounting the sensor farther from the
detection object may eliminate unneeded contact with the sensor, thereby
extending the life of the sensor.
These are just a few
examples, but the benefits of using extended distance sensors are obvious in
many applications. Think of how extended distance sensors could save you time
and money in your application.
B. The material being
sensed (i.e. brass, copper, aluminum, steel, etc.) makes a difference in the
type of sensor needed.
Note: If you are
sensing a non-metallic object, you must use a capacitive sensor.
The sensing distances
we specified in our catalog were calculated using FE360 material. Many
materials are more difficult to sense and require a shorter distance from the
sensor tip to the object sensed.
If sensing a material
that is difficult to sense, you may consider using our unique stainless steel
sensing technology. This will measure virtually all materials at the specified
Have you ever tried
using a round sensor or short body version, and not been able to make it fit?
Our rectangular sensors can meet your needs. The same technology used in a
standard round proximity sensor is enclosed in a rectangular housing. This
technology includes sensing distances, electrical protection and switching
frequencies similar to round sensors.
unshielded sensors are also referred to as embeddable and non- embeddable.
Unshielded sensors allow longer sensing distances but shielded sensors allow
Will the sensor be
placed underwater, in a high-temperature environment, continually splashed with
oil, etc.? This will determine the type of sensor you may use.
Note: If using AC
sensors, please skip this step.
The type of output
required must be determined (i.e., NPN, PNP or analog). Most PLC products will
accept any output. If connecting to a solid state relay, a PNP output is
This is somewhat
determined by what the sensor will be connected to. Some simple guidelines to
This is determined by
the sensor application and what the sensor will be connected to. Sensors with
analog outputs produce an output signal approximately proportional to the
target’s distance from sensor.
If you only need to
sense presence of an object, you do not need an analog output. Note that many
discrete-output proximity sensors come with “adjustable” ranges, i.e.
“adjustable from 20-80 mm”. This means only that you can set the target
distance for presence detection within that range; it does not mean you are
getting a variable output.
Cost: The cable is
integrated into the sensor and included in the price. Q/D cables must be
Environmental Impact: Since the cable is
sealed into the sensor, there is less chance of oil, water or dust penetration
into the sensor, which could cause failure.