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Encoder
Systems
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Gurley has been a major
designer and manufacturer of precise measuring instruments since 1845, and a
leading supplier of optical encoders since the early 1950's. Gurley is a
U.S. manufacturer with a solid reputation for being a creative, responsible
and responsive vender. We have a full catalog of standard products, most
of which are shown in this short-form catalog. However, we do add
products regularly -so please call or email if you do not see what you are
looking for. In the product descriptions that follow, all incremental encoders are
available with an index (once per rev) signal that is fully functional up to
the maximum frequency response.
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Pioneers of Virtual Absolute™ technology
Gurley digital linear encoder
Learn
more about Virtual Absolute technology.
For complete specifications, please
request a technical data sheet or call or email for free applications
assistance. |
Virtual
Absolute™ technology features:
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A
VA™ encoder is usually dramatically less expensive than a
conventional absolute.
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The
initialization distance or angle is a fixed and very small motion,
regardless of the starting position or direction of travel. Just
"bump" it to find out where you are.
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The
encoder contains inherent built-in-test functions not found in any
conventional encoder. It reports not only various encoder
malfunctions, but can also help detect system problems such as too
high a temperature or excessive speed.
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The
encoder generates the same whole-word information as a conventional
absolute, so it is very easy to interface to computers, PLC's, servo
controls, etc.
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With
its simpler optics, a rotary VA™ encoder can be smaller than a
conventional absolute of equal resolution. And you can use a linear
VA™ encoder for applications where a suitable conventional
absolute linear would be very hard to find.
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Because
of its simpler electronics, reduced parts count, and less critical
internal alignments, a VA™ encoder is inherently more reliable
than a conventional absolute.
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Rotary Encoders |
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Model |
Shaft |
Body
Size |
Usage |
Output |
Max
Resolution |
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Internal
Resolution |
External
Resolution
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Series 920/920B |
S: Ø 1/4", bell
flange > 10mm
B: flex stator couple Ø 3mm |
Ø 1.94" X 1.48" long/ Ø 1/4" X 1.48" long |
Instrument
IP66 rated |
Incremental |
144,000 counts/rev |
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Series 911S |
Ø 1/8" |
Ø 1.06" X 1.8" long |
Instrument or Light Industrial |
Incremental |
7,200 counts/rev |
144,000 counts/rev |
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Series R135/R137 |
S: Ø 4mm,
1/8",1/4"
B: flex stator couple Ø 3mm
C: int. stator couple Ø 3mm |
Ø 35mm X 30mm long/ Ø 37mm X 37mm long |
Light-medium
Industrial
IP54/IP64 rated |
Incremental |
144,000 counts/rev |
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Series 825S/825P |
Ø 3/8" |
Ø 2.5" X 2.8" long (max) |
Industrial |
Incremental |
192, 000 counts/rev |
480,000 counts/rev |
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Series 835S |
Ø 3/8" |
Ø 3.5" X 2.4" long (max) |
Industrial |
Incremental |
360,000 counts/rev |
900,000 counts/rev |
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Series 8X60 |
S: 9/16”
H: 14 mm |
5.91” W X 1.79”D
5.91” W X 1.79”D |
Industrial |
Incremental |
4,608,000
count/rev |
4,608,000
count/rev |
| Rotary Encoders |
GPI has several design families of incremental rotary encoders. The five most popular series are shown in this chart: 920, 911, R135, 825 and 835. There are a number of other customizable sizes available including miniature encoders and very high line count models. Multiple read head models can offer repeat accuracy up in the range of arc seconds.
Virtual Absolute versions are available in many rotary model families. Additional options are available such as vacuum rated bearings, Ferro fluid rated seals and a zero-index signal. Various standard and special shaft and flange configurations are also available. GPI will also provide exclusive proprietary designs for OEM use. Contact Rogers Sales for details. |
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Linear Encoders |
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Model
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Cross-section |
Measuring Lengths |
Construction |
Output |
Max Resolution |
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Model LE18 |
18 mm x 46 mm
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up to 1.2 m
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Enclosed
IP54 rated |
Incremental |
0.1 to 10µm |
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Model LE25 |
25 mm x 52 mm |
up to 3 m |
Enclosed
IP54 rated |
Incremental |
0.1 to 10µm |
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Linear Encoders
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The linear incremental and linear virtual absolute enclosed designs share the
same housing. Simply add a "V" to the model number for virtual
absolute versions. A typical application for linear encoders is to provide
position feedback for any traversing or reciprocating axis. GPI has a variety of
designs to accommodate any stroke and speed/accuracy combination. High
resolution and high accuracy versions are available. |
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Modular Encoders
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Motion Type |
Mounting |
Precision |
Output |
Max Resolution |
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Rotary or
Linear |
Open Frame |
Medium to High |
Incremental |
Linear 2.5µm
Rotary 0.5 arcsec |
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Rotary or
Linear |
Instrument or
Light Industrial |
High |
Incremental or Virtual
Absolute |
0.25µm |
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Linear |
Open Frame |
High |
Incremental |
0.25µm |
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Enclosed |
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Incremental |
144,000 counts/rev |
| Modular
Encoders
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Modular component level designs allow you, the design engineer, to build your
own encoder. Glass or stainless scales and disks can be mated to various read
heads and interpolating electronics. Again, all resolution and accuracy ranges
are supported.
Call us for special application assistance.
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Absolute Encoders |
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Model
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Shafts |
Body Size |
Motion Type |
Usage |
Output |
Max Resolution and RPM |
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Model A25S |
Ø 3/8" |
Ø 2.5" X 1.25" long |
Rotary |
Industrial |
Absolute |
131,072 words/rev
600 RPM |
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Model 60/25H |
Hallow Shaft
Ø 2.5" |
Ø 6" OD X 4.2" long |
Rotary |
Industrial,
Metrology |
Absolute |
2,097,152 words/rev 100 deg./sec. |
Model
A58 |
3mm to 0.25" |
2.85" X 2.16" |
Rotary |
Industrial |
Absolute |
65,536 words/rev
50 RPM |
| Absolute Encoders
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| These two absolute encoders offer 17 and 21 bit position resolution
respectively with both parallel and serial output options. Output and read
electronics modules are engineered to fit the position data to your needs.
Absolute encoders allow you to read position at start up with out any motion at
all. Please also see the discussion about patented virtual absolute versions of
GPI standard incremental encoders. Virtual absolute position reads require only
micro motion, which is often imperceptible to the machine process. |
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Other Encoders |
| Model |
Shafts |
Body Size and Cross
section |
Motion Type |
Usage |
Output |
Max Resolution |
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Internal
Electronics |
External
Electronics |
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Series 835H
Hollow Shaft |
up to Ø 30 mm
and
up to Ø 1.20" |
Ø 3.625" x 2.395" |
Rotary |
Industrial |
Incremental |
360,000 counts/rev |
900,000 counts/rev |
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Rack and Pinion
Linear |
|
.3" x .48" (rack)
Ø 2.37" x 1.56" (encoder) |
Linear |
Industrial
Unlimited meas. range |
Incremental |
0.25µm |
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Series 8460
and 8560
Angle |
S: Ø 14 mm
H: Ø 50 mm through hole |
Ø 6" X 2.4"
long body |
Rotary |
Robust Industrial Metrology |
Incremental |
360,000 counts/rev |
900,000 counts/rev |
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Models P20 and P40
Plunger Measuring Gauges |
4 mm
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Linear
20 mm/
40 mm |
Instrument/
Light
Industrial |
Incremental |
0.5µm |
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Other Encoders
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GPI has additional family’s of
products to solve your needs. For example, GPI offers these special
application design versions.
- Hollow shaft designs may be float mounted with tether or may be end mounted
and receive a blind drive shaft.
- Rack & pinion encoders use a conventional shafted design with gear that
pick up the linear translation of motion against a precision rack.
- The series 8460/8560 offer one and two arc second alternatives to
expensive, hard to get European designs for rotary index tables among other
applications.
- Plunger encoders operate like a dial indicator measuring instrument,
reading displacement of the plunger (touching an object) with respect to a
fixed surface or machine frame.
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