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Miniature
Length SenSor
ContaCt rotary SenSor
ZMD Series
• Compact Size
• Quadtarure Output
• Built-In Spring Tensioning
• Mounts in Any Position
• 4.75 to 28 Vdc Input Voltage
• NPN Open Collector Output
The ZMD Series miniature length sensor
is compact in size and easy-to-use,
designed for light to medium duty sensing
applications. It features a built-in springloaded torsion arm that provides a simpleto-adjust torsion load, allowing the unit
to be mounted in almost any orientation,
including upside down. Using a 152 mm
(6") circumference wheel, the ZMD can be
used on almost any surface, while operating
at speeds up to 3000 feet per minute. The
housing is a durable, conductive composite
material that will eliminate static build
up. Whether you need to measure speed,
position, or distances, the ZMD series sensor
is the ideal solution.
AU-ZMD0250B, 250 ppr length sensor with
AU-W100060F, 152 mm (6") circumference urethane
wheel. Shown smaller than actual size.
SPECIFICATIONS
ELECTRICAL
Input Voltage: 4.75 to 28 Vdc maximum
for temperatures up to 85ºC; 4.75 to
24 Vdc for temperatures between
85 to 100ºC (185 to 212°F), reverse
polarity protected
Input Current: 100 mA max (65 mA
typical) with no output load
Outputs: NPN open collector transistor,
20 mA maximum current
Maximum Frequency: 200 KHz standard
Noise Immunity: Tested to BS EN61000-
6-2; BS EN50081-2; BS EN61000-4-2;
BS EN61000-4-3; BS EN61000-4-6, BS
EN500811 [Tested with 2 m (6.6') cable]
Symmetry: 180º (±18º) electrical
Quad. Phasing: 90º (±22.5º) electrical
Minimum Edge Sep: 67.5º electrical
Accuracy: Within 0.017º mechanical or
1 arc-minute from true position
(for PPR>189)
MECHANICAL
Maximum Mechanical Speed:
6000 RPM. Higher speeds may be
achievable, contact the factory
Shaft Material: Stainless Steel
Shaft Tolerance: +0.0000/-0.0004"
(+0.000/-0.010 mm)
Radial Shaft Load: 5 lb. maximum rated
load of 2 to 3 lb for bearing life of 1.2 x
10 10 revolutions
Axial Shaft Load: 5 lb. maximum rated
load of 2 to 3 lb for bearing life of 1.2 x
10 10 revolutions
Starting Torque: 0.05 oz-in IP50;
0.4 oz-in IP65
Electrical Connection: 2 m (6.6')
cable, (foil and braid shield, 24 AWG
conductors). Drain wire internally
connected to case
Mounting: Pivot Shaft can be mounted
from either side of the housing and is
field reversible
Housing: Stainless steel fibers in a high
temperature nylon composite
Weight: 142 g (5 oz) typical
ENVIRONMENTAL
Operating Temperature: -20 to 85°C
(-4 to 185°F)
Storage Temperature: -25 to 85°C
(-13 to 185°F)
Humidity: 98% RH non-condensing
Vibration: 10 g @ 58 to 500 Hz
Shock: 80 g @ 11 msec duration
Sealing: IP50
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Dimensions: mm (inch)
MOUNTING BRACKET
This accessory angle mounting bracket allows for a
variety of mounting positions and makes installation of
the ZMD even easier.
6.000 CIRCUMFERENCE (ordered separately)
Metric wheel available
Ø5.995 (Ø0.2498)
63.5 (2.500)
79.6 (3.13)
TORQUE ADJUSTMENT
UNDER RUBBER CAP
"L"
SIDE
33 (1.3)
TYPICAL
25.3 (1.00)
"R"
SIDE
Open Collector
Output Wiring
The ZMD Series length sensors have open
collector outputs. An open collector output
brings the uncommitted collector of the
encoder switching device to the external
world. Because the collector element is not
associated with the sensor supply voltage,
the sensor output collector may be “pulled
up” to external voltages different than the
encoder supply voltage (30 Vdc maximum).
NPN open collector outputs are current
sinking devices. An output signal will not
be generated unless a pull-up resistor is
connected from the open-collector to the
positive side of an external supply. The same
supply can be used for powering the unit and
for the pull-up resistor.
Mounting Bracket
This accessory angle mounting bracket allows for a variety of
mounting positions and makes installation of the ZMD even easier.
Dimensions:
mm (inch)
CABLE LENGTH
2 meter STANDARD
1/4-20 or M6 THREADS AVAILABLE
SHAFT CAN BE REVERSED FOR
MOUNTING FROM EITHER SIDE
50.8
(2.00)
Ø
43.4 (1.71)
(1.00)
25.4
44.45
(1.75)
12.6 (0.50)
R.14
25.4
(1.00)
(0.25)
6.35
"L" SIDE
"R" SIDE
Ø = diameter
AU-RPGMB002
mounting bracket.
6 (0.24)
18.8 (0.740)
2.54 (0.100)
15.2 (0.60)
CABLE
FUNCTION
WIRE COLOR
+Vdc Red
Com Black
A White
B Green
44.45
(1.75)
19.05 (0.75)
31.75 (1.25)
R.093
3.175 (0.125)
45.97
(1.81)
Shield Bare
To Order Visit omega.com/zmd_series for Pricing and Details
MODEL NO. DESCRIPTION
AU-ZMD0250B
AU-ZMD1000B
AU-W100060F
AU-W100060K
AU-RPGMB002
Ordering Example: AU-ZMD0250B miniature length sensor with 250 ppr and AU-W100060K 6" circumference knurled measuring wheel.
AU-ZMD1000B quadrature length sensor with 1000 ppr, AU-W100060F 6" urethane measuring wheel, AU-RPGMB002 mounting bracket.
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Miniature length sensor with quadrature output, 250 ppr.
Miniature length sensor with quadrature output, 1000 ppr.
152 mm (6") circumference urethane measuring wheel
152 mm (6") circumference knurled measuring wheel
Mounting bracket
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