AMETEK 925 Linear Cable Reel Sensor - Manual (Page 6)

Multi-Turn Resolvers
In instances where a high degree of accuracy
or a long stroke is required, it may be advanta-
geous to use a multi-turn resolver. The multi-
turn resolver can generate many counts per
revolution of the cable drum (up to 16,384 with
our Series 2500 electronics) and will accumu-
late these counts per revolution to track the
total linear travel. By using the linear travel per
revolution of the drum we can formulate a scale
factor for the electronic package that will display
linear cable travel throughout the full stroke.
Sensor Type
Single Turn Resolver
Cable reel sensor with single turn resolvers are
setup so that the full stroke of the cable reel is
equal to approximately 350 degrees rotation of
the resolver. The resolver signal is fed to a con-
verting device, like the Gemco Series 2500 PLS.
The Series 2500 can be scaled to display the
linear motion of the cable reel sensor. Example:
A 20 ft.. stroke cable reel sensor is specified
to be used with our Series 2500 PLS. Desired
accuracy is .01 ft. By calculating a scale factor
based on 360 degrees rotation of the resolver
such that 2000 counts or (20.00 ft.) is obtained
at 350 degrees, full linear display is achieved.
Encoder and Potentiometer Sensors
When encoders or potentiometers are used we
can formulate the outputs to most any customer
specification. As standard packages potentiom-
eters would be geared so that the full stroke of
the cable reel sensor was equal to approximately
90% of the active rotation on a single turn pot
and approximately 90% of the last turn on a 10
turn pot.
Incremental encoders can be directly driven
off the cable drum to give a known number of
pulses per revolution.
Absolute encoders can be geared so that the
maximum number of counts would equal the
specified linear stroke. If maximum stroke is
exceeded, the encoder will roll through to zero.
Specifications
Stroke Range
Mechanical Accuracy
Speed Range
Cable Tension
Cable Material
Housing Material
Seal
Temperature Range
Up to 1200 inches (100 ft.) standard
0.05% of active stroke
Variable
Type A unit 2.5 lbs. to 4.2 lbs. (stroke to 96”)
Type A unit 1.25 lbs. to 4.2 lbs. (stroke to 192”)
Type B unit 1.6 lbs. to 14.27 lbs.
Type C unit .75 lbs. to 16.30 lbs.
.056” (actual) stainless steel aircraft grade
10 gauge cold rolled sheet steel with baked enamel
paint finish
Splash Proof
Sensor dependent (most encoders and potentiometers
are around 0° to 180° F standard, resolvers are
typically -50° to 250° F). Check manufacturers specs