©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
2017-07-24 Rev. D Page 1 of 13
www.ctscorp.com
Series 291
Precision, Long-life 12mm Optical Encoder
▪ Available with 4, 6, 8, 24,32, 64 Pulses per Revolution
▪ Optional Momentary Switch
▪ Multiple options for terminations, resolution,
cable lengths, and operating voltage
Description
The 291 Series allows versatility in design applications by providing
highly reliable, precise digital output and long rotational life with our non-contacting design. This product
provides flexibility in resolution, power consumption, and operating temperatures. The options of Schmitt
trigger, detents, momentary switch, shaft & bushing length, dual shaft, termination styles, torque, operating
voltage, and IP ratings provide flexibility to meet your exacting design requirements.
Ordering Information
Code
Bushing Length “B”
0
.312” For single shaft construction
D
.256” For dual shaft construction
(not for 32, 64 PPR)
Code
Spec.
F
Flat
S
Slotted
Code
Termination
V1
.050” pitch pins
Rear facing
.132” length(not for 64 PPR)
P1
.10” pitch pins
Rear facing
.236” length
*C4
4” ribbon cable
With .050” pitch
connector terminals (not
for 64 PPR)
*C5
5” ribbon cable
With .050” pitch
connector terminals (not
for 64 PPR)
*C6
6” ribbon cable
With .050” pitch
connector terminals (not
for 64 PPR)
Code Shaft Length “L”
Single shaft structure
22 .687”
24 .875”
Dual shaft structure
DD Outer shaft: .685”
Inner shaft: 1.059”
(Not available with locating
lug, 32 and 64 PPR, see page
8 for additional details)
5 positions
Output
Combination
832
8 PPR, 32 Detents
624
6 PPR, 24 Detents
416
4 PPR, 16 Detents
800
8 PPR, No Detents
600
6 PPR, No Detents
400
4 PPR, No Detents
X00
24 PPR, No Detents
(only available with
Schmitt trigger)
X24
24 PPR, 24 Detents
(only available with
Schmitt trigger)
Y00
32 PPR, No Detents
(only available with
Schmitt trigger)
Z00
64 PPR, No Detents
(only available with
Schmitt trigger)
Code
Spec.
A
5.0V
B
3.3V (not for
64 PPR)
291 V1 0 22 F 832 A B A
Series
Termination
Bushing Shaft Shaft
Length Length Trim
Output Operating Switch Schmitt Trigger
C Combination Voltage & Locating Lug
2022124
1
2 1 E
S RTTT T T T
T
TTT
T
T
TSS
E
Code
Spec.
A
None
B
Momentary
(not for 64 PPR)
Note: * Cable connector for C4, C5, C6 is AMP P/N 215083-6 or Equivalent
Code
Spec.
BLANK
Without Schmitt trigger,
With locating lug (not for
32, 64 PPR)
A
Without Schmitt trigger,
Without locating lug (not
for 32, 64 PPR)
S
With Schmitt trigger,
Without locating lug
B
With Schmitt trigger,
With locating lug
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 2 of 13
www.ctscorp.com
Electrical Specifications
Encoder Function
Parameter
Conditions &
Remarks
Min
Nominal
Max
Unit
Voltage (4, 6, 8, 24, 32 PPR)
4.75
3.175
5.0
3.3
5.25
3.425
VDC
Voltage (64 PPR)
4.5
5.0
5.5
VDC
Output Code
2-Bit Quadrature
Channel A leads
Channel B by 90°
during clockwise
rotation
Sink Current
5.0 VDC
3.3 VDC
2.0mA
1.0mA
Power Consumption
5.0 VDC
3.3 VDC
150
80
mW
mW
Resolution
4, 6, 8, 24, 32, 64
Pulses per
Revolution
Mechanical and Environmental
Manual Soldering
Maximum temperature of 350°C for 5 seconds
RoHS
Lead-Free. Fully compliant to RoHS Directive
Shock :
Per MIL-STD-883F ( 100G’s)
Vibration :
Per MIL-STD-883F ( 15G’s)
IP Rating (4, 6, 8, 24, 32 PPR):
IP 50
IP Rating (64 PPR):
IP 40
Packaging :
Standard anti-static tray packaging
Operating Temperature:
-40°C to +85°C
Storage Temperature:
-55°C to +100°C
Storage Temperature:
(32, 64 PPR)
-40°C to +100°C
Rotational Life
No detent @ 30 RPM 3 Million Cycles
With detent @ 30 RPM 1 Million Cycles
Push-Pull Strength of Shaft
(4,6,8,24, 32 PPR)
(64 PPR)
10 seconds
20 kg
10 seconds
13.6 kg
Terminal Pull-out Strength
10 seconds
6 kg
Rotational Torque
(4, 6, 8, 24 PPR)
(32 PPR)
Running
Running
10 to 30 gf-cm
30 gf-cm Max.
(64 PPR)
Running
100 gf-cm Max.
Rotational Torque
24 Detents
90 to 190 gf-cm
16, 32 Detents
50 to 150 gf-cm
Detent Options
0, 16, 24, 32
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 3 of 13
www.ctscorp.com
Optional Momentary Switch Function:
Parameter
Conditions & Remarks
Min. Nominal Max Unit
Switch contact resistance
10 ohms
Switch rating
5 VDC @10 mA
Switch travel
0.25 0.5 0.75 mm
Actuation Force
400 510 620 grams
Switch Life
Standard
1 Million Actuations
Switch Life
Consult CTS for custom life requirements
Mechanical Specifications
Figure 1 – 291V1… – Without Schmitt Trigger, With Left Locating Lug, .050” Pitch Pins Facing Rear
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 4 of 13
www.ctscorp.com
Figure 2 – 291V1…S – With Schmitt Trigger, Without Locating Lug, .050” Pitch Pins Facing Rear
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 5 of 13
www.ctscorp.com
Figure 3 – 291V1…A – Without Schmitt Trigger, Without Locating Lug, .050” Pitch Pins Facing Rear
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 6 of 13
www.ctscorp.com
Figure 4 – 291V1…B – With Schmitt Trigger, With Locating Lug, .050” Pitch Pins Facing Rear
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 7 of 13
www.ctscorp.com
Figure 5 – 291P1…A – Without Schmitt Trigger, Without Locating Lug, .100” Pitch Pins Facing Rear
291P1…S – With Schmitt Trigger, Without Locating Lug, .100” Pitch Pins Facing Rear
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 8 of 13
www.ctscorp.com
Figure 6 –291P1… – Without Schmitt Trigger, With Locating Lug, .100” Pitch Pins Facing Rear
291P1…B – With Schmitt Trigger, With Locating Lug, .100” Pitch Pins Facing Rear
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 9 of 13
www.ctscorp.com
Figure 7 –291C… – Without Schmitt Trigger, With Locating Lug, With Ribbon Cable
291C…B – With Schmitt Trigger, With Locating Lug, With Ribbon Cable
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 10 of 13
www.ctscorp.com
Figure 8 – 291C…A – Without Schmitt Trigger, Without Locating Lug, With Ribbon Cable
291C…S – With Schmitt Trigger, Without Locating Lug, With Ribbon Cable
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 11 of 13
www.ctscorp.com
Figure 9 – 291P1…Z00AA – 64 PPR, With Schmitt Trigger, With Locating Lug, .100” Pitch Pins Facing
Rear, Without Momentary Switch
4, 6, 8, 24 PPR
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 12 of 13
www.ctscorp.com
4, 6, 8, 24, 32 PPR
64 PPR
©2017 CTS® Corporation. Information/product(s) subject to change. No warranty that product(s) will meet the stated specifications for customer specific applications or test
equipment. Visit www.ctscorp.com for list of applicable patent(s), more information, or to request a quote.
Series 291
Compact Optical Encoder
2017-07-24 Rev. D Page 13 of 13
www.ctscorp.com
