BEI Sensors ES20 User Manual

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ES20

Environmentally Sealed Incremental Encoder

The ES20 is a rugged incremental encoder that is environmentally
sealed through the use of a magnetic shaft coupling connection.
This connection allows the encoder to be completely enclosed
and sealed against water ingress. It is rated to IP67 and can
operate while fully immersed in one meter of water for up to 30
minutes. The magnetic coupling also allows the encoder to be
isolated from high shock and vibration, dust tight, and resistant to
debris in the environment. Since the ES20 is not physically
coupled to external equipment, the problem of shaft misalignment
is eliminated, meaning no more broken couplings!
The ES20 is ideal for applications with heavy wash-downs,
temporary water immersions, and excessive environmental
debris. It combines the high accuracy, repeatability and
robustness needed for use in harsh environments and can help
reduce costly downtime of your system.

Specifications

Mechanical

Mating Shaft Diameter: 1/4” and metric versions
Magnetic Coupling Cover: Engineered plastic
Starting Torque: 0.5 oz-in max
Enclosure: Aluminum (sealed aluminum castings)
Maximum RPM: 5000 RPM
Moment of Inertia:
Maximum Acceleration: 25,000 rad/s/s
Torsional flexibility: 0.37 deg/oz-in
Kinematic Error: 3 arc-min

e

W

ight: 13 oz

60.2 X 10

-4

oz-in-sec2

RMS

Electrical

Supply Voltage: 5 to 28 VDC available
Voltage/ Output:

28V/V: Line Driver, 5-28 VDC in, Vout = Vin
28V/5: Line Drive, 5-28 VDC in, Vout = 5 VDC
28V/OC: Open Collector, 5-28 VDC in, OC out
Current Requirements: 100 mA typical + output load, 250
mA (max)
Protection Level: reverse, overvoltage and output short
circuit

Code: Incremental
Output Format: 2 Channels in quadrature, with gated index

and complementary outputs.

Cycles per Shaft Turn: 1 to 1,024 (See Table 1)
Frequency Response: 100 KHz
O

utput Terminations: (See Table 2)

Environmental

Temperature: Operating, 0° to 70°C; storage (non-operating),

-25° to 90°C. Consult factory for extended temperature
ratings.

Shock: 25 g’s for 11 msec duration
Vibration: 5 to 2000 Hz @ 10 g’s
Humidity: 100% RH with condensation
Enclosure Rating: IP67 / IP68 (Consult factory for IP68

applications)

ES20 Environmentally Sealed Incremental Encoder Ordering Options For assistance, call 800-350-2727

Use this diagram, working from left to right, to construct your model number.

Example: ES20D-37-500-ABZC-28V/V-SM18-S (-S: special shaft, diameter/ length, output level or termination)

ES20

Type:

2.00” Diameter
Housin

Housing Config:

D = Square

D

Magnetic Hub Bore:

25 = 0.250”
Blank = None

Consult factory for other sizes

Flange

Channels:

ABZC = Dual with Index
and complements
ABC = Dual w/comp.
ABZ = Dual w/index

Cycles per Turn:

See Resolution Table 2

Voltage/Output

28V/V = 28 V in/out
28V/5 = 28 V in/5 out
28V/OC = 5-28Vin / OC out

Output Location:

S = Side

S

Output Termination:

M18 = MS3102R18-1P
M16 = MS3102R16-1P
M18 = MS3102R18-1P

Special Features:

Consult Factory

S

Tel -0782 / 800-350-2727 | Fax [phone]

: 805-968 :

7230 Hollister Ave., Goleta, CA 93117 | www.beisensors.com

Specification No. 02106-001 Rev. 06/11

Table 1: Resolutions

p

1* 2 3 5 6 8 10 11 12 24 25 30 32 40 50 60 64
70 75 80 100 105 112 155 120 125 150 192 200 240 250 256 300 336
360 400 410 500 510 512 600 720 785

*No index.

1000 1024

Table 2: Output Terminations

M18 Connector

PIN Channel

A A
B B
C Z
D +V
E ---

F 0V
G CG
H A/

I B/
J Z/

ES20 Dimensions

SM18

(1.61)

ut Waveform

Out

(4) Ø 0.16

R0.13

Axis of Rotation

Magnetic Hub

Magnetic Hub Bore .250”
BEI Part No. 924-38540-250
(supplied with encoder)

Consult factory for other bore sizes

These commodities, technology or software if exported from the United States must be in accordance with the
Bureau of Industry, and Security, Export Administration regulations. Diversion contrary to U.S law is prohibited.

2.33

2.06

0.88

1.75

2.06 SQ

Tel:[phone] | Fax: [phone]

7230 Hollister Ave., Goleta, CA 93117 | www.beisensors.com

Specification No. 02106-001 Rev. 06/11