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871R
Ring Sensor
Whether
you're counting parts falling from an assembling machine or
measuring a liquid's viscosity, sometimes a ring sensor is
the only tool for the job. Ring sensors are self-contained,
general purpose, solid-state devices that sense the presence
of metal objects (ferrous and nonferrous) passing through
their sensing fields. Available in 12, 20, 50 and 100mm ring
diameter sizes, Allen-Bradley Bulletin 871R Ring Sensors provide
multiple sensing options for a wide range of applications.
Ring
sensors are especially effective in applications where the
target is falling, as opposed to moving laterally along a
predetermined path. The ring-shaped sensing area makes precise
target movement less crucial, and lends itself well to applications
where target objects are moving through a tube or pipeline.
Like
all Allen-Bradley proximity sensors, they have the quality
and performance features you've come to expect from a worldwide
leader in presence sensing technology.
- Cable
or micro quick-disconnect styles provide superior application
flexibility
- Short
circuit, reverse polarity, transient noise, overload and
false pulse protection incorporated
- Minimum
ball sizes ranging from 2.5mm to 8.0mm
- LED
output indicator
- CE
marked for all applicable directives
The minimum
target size required for Bulletin 871R Ring sensor is expressed
in terms of a ball size. Specification of minimum ball size
is based upon the diameter of a standard steel ball. A ring
sensor with a minimum ball size of 2mm will sense smaller
targets than a ring sensor with a 4mm minimum ball size. Target
material, shape, and size will all affect the ability of the
sensor to detect the target as it passes through the sensing
field within the ring.
Ring
diameter is not directly correlated to the minimum ball size.
For example, The Allen-Bradley 50mm diameter ring sensor has
a minimum ball size specification of 3mm (0.12"), while the
20mm diameter ring sensor has a minimum ball size specification
of 6mm (0.24").
Ring
sensors are utilized in a multitude of industrial applications.
These sensors are particularly suited for applications which
benefit from an enclosed sensing area. A few examples of common
ring sensor applications include:
Stamping
Industry - Ejection Control
Counting ejected metal parts to verify that the part is no
longer in the machine.
Detecting
punched material has left the tool ensuring that each punch
process has been executed properly.
Assembling
Industry
Counting parts falling from an assembling machine.
Detecting
screws passing through machine feed tubes to prevent misfeeding
of automated screw equipment.
Food
Industry
Tracing of steel balls used for cleaning tubes.
Plastics
Processing Industry
Control of metallic impurities in molding resin.
Packing
Industry
Detecting and counting of metallic parts.
Materials
Handling / Viscosity Measuring
Multiple sensors used to detect speed of metallic ball passing
through a material.
Enameling
Lines
Tracing
of steel balls used for cleaning tubes.
Manufacturing
Industry
Detecting a joint on a metallic pipe or cable.
Monitoring
of the wire input at a stranding machine.
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