GPI Encoder Selection Guide
  
Note: For all incremental encoders, max. resolution is after 4x quadrature decode in the user's electronics
 

  Rotary Incremental Encoders

Series Dia. Max. Disc Linecount Max. Resolution
(Counts/Rev.)
Notes
R112 0.47"
12mm
500 32,000 Smallest High Resolution Encoder, Solid or Blind Hollow Shaft
M122 0.86"
22mm
2048 8192 Compact Magnetic Encoder
R119 & R120 0.75"
19/20mm
1,024 65,536 Solid or Blind Hollow Shaft
9x11 1.1"
28mm
1,800 144,000 Two Accuracy Grades
R137 1.5"
37mm
3,600 230,400 Solid or Blind Hollow Shaft
7700 < 1.7"
<46mm
5,000 20,000 Modular Kit Encoder
9x20 2.0"
51mm
4,500 144,000 Solid or Blind Hollow Shaft
R158 2.28"
58mm
5,000 1,000,000 -40 to 100 C option; 60N/40N
9x25 2.5"
63mm
9,000 200,000 Three Accuracy Grades
8x35 3.5"
89mm
11,250 900,000 Two Accuracy Grades
8x35H 3.5"
89mm
11,250 900,000 Hollow Shaft, Three Accuracy Grades
8x60 6.0"
152mm
18,000 3,600,000 Metrology Grade, Solid or 
Hollow Shaft 
9480H 8.0"
203mm
18,000 7,200,000 Metrology Grade Hollow Shaft 
9710 < 23"
< 584mm
36,000 80x linecount Modular Encoder

  Rotary Absolute Encoders

Series Dia. Max. Resolution (Words/Turn) Notes
A108 0.3"
8mm
12 bits Compact Magnetic Encoder
M122 0.86"
22mm
13 bits Compact Magnetic Encoder
A23S 2.28"
58mm
25 bits (13 bits/turn) Single and Multi-Turn Option
A25S 2.5"
63mm
17 bits Fully Accurate Up to 600 rpm
A19 0.75"
19/20mm
15 bits Miniature, Low-Cost True Absolute
A37 1.5"
37mm
12 bits Compact, Low-Cost True Absolute
A58 2.28"
58mm
16 bits High Resolution, Low-cost True Absolute

  Rotary Virtual Absolute Encoders

Series Dia. Max. Resolution (Words/Turn) Notes
7700 < 1.7"
45mm
19 bits Modular Kit Encoder
Vx20 2.0"
51mm
19 bits Solid or Blind Hollow Shaft
Vx35H 3.5"
89mm
20 bits  Hollow Shaft
V860H 6.0"
152mm
20 bit Hollow Shaft 1 MHz Max. Data Update Rate
9710VA up to 23"
600mm
22 bits Modular Encoder

  Linear Incremental Encoders

Series Max. Length Max. Resolution  Notes
7700 call 0.1 um Modular Kit Encoder
LE18 47"
1.2m
0.05 mm Internal ASIC
LE20 60"
1.5m
0.05 mm Internal ASIC
LE25 125"
3.2m
0.05 mm Internal ASIC
LE35 125"
3.2m
0.05 mm Internal ASIC
P20 20 mm 0.1 mm Plunger-Type Encoder
P40 40 mm 0.5 mm Plunger-Type Encoder
R&P Unlimited 0.25 mm Rack & Pinion Style
9717 3.2 m (125") 0.5 mm Modular Encoder

  Linear Virtual Absolute Encoders

Series Max Length Max. Resolution  Notes
7700 call 19 bits Modular Kit Encoder
VL18 1m 1.0 mm Three Accuracy Grades
9710VA 10"
254mm
0.25 mm Modular Encoder