Dynapar Series 7143 Data Sheet
Encoders
Series 7143 Magnetic Sensors
• High output gear tooth sensor
• Requires no power Supply
• For low RPM measurement
Dynapar™ brand
APPLICATION/INDUSTRY
For monitoring the speed of any shaft when
mated with a magnetic-input tachometer and
positioned in alignment with the teeth of a
ferrous material gear.
DESCRIPTION
Typically, 60-tooth, 16-pitch gears provide the
optimum characteristics for RPM measurement, but other gear types can serve special
application needs. They are well suited for
industrial machinery as well as test stand and
laboratory installations. Series 7143 is available
in a plastic tube model, supplied with mounting
bracket, or in threaded stainless-steel model.
Both include a 10-foot shielded cable with
mating connector.
Series 7143 features an extra strength
permanent magnet pole-piece and high
inductance coil. Gear teeth supply the motion
within the magnetic field, so that the sensor/
gear combination acts as an AC generator.
Voltage output is directly proportional to
velocity and closeness of the air gap.
FEATURES AND BENEFITS
• High output design for superior low
velocity performance
• Two-wire, self generating output
requires no power connection
• Economy plastic, or heavy-duty
noncorrosive stainless steel models
• Supplied with all necessary mounting
hardware and cable
SPECIFICATIONS
STANDARD OPERATING CHARACTERISTICS
Output Voltage: 25 VDC minimum peak to peak
(into 100 kΩ load) with 16-pitch gear, 1000 RPM,
0.01" gap
DC Resistance: 1200Ω maximum
Inductance: 400 mH maximum
Temperature Range: -100° to +225°F (-73° to
+107°C)
Materials: Model Number 714300-001: Plastic
shell, stainless steel pole piece; Model Number
714300-002: Stainless steel shell and pole piece
Mounting: Model Number 714300-001: Aluminum
bracket (supplied); Model Number 714300-002:
Threaded body with locknuts (supplied)
Connections: 10' cable assembly (supplied)
Dimensions:
714300-001
.106"
2.69 mm
12.83 mm
714300-002
2.69 mm ± .13 mm
.505"
.106" ±.005"
.020"
.51 mm
.010"/0.25 mm
.030"/0.76 mm
2.208"
56.08 mm
1.691"
42.95 mm
.625"/15.88 mm – 18 UNF 2A Thread
Locknut
2.250"
57.15 mm
1.093" Ref.
27.6 mm
1.125"
28.58 mm
.517"
13.13 mm
19.05 mm
12.52 mm
.750"
SELECTING THE PROPER GEAR
It is vital when using the Series 7143 for revolutions per minute
applications that a 60-tooth, ferrous gear be properly selected.
Optimum results relative to the sensing of low rpm, as well as
high speeds will be achieved with gears having a pitch of 16 or
less, and a gear-to-sensor gap of 0.01" or less. Sixty-tooth gears
with up to 20 pitch and/or gear-to-sensor gaps of up to 0.05",
will produce excellent results provided that operation below
approximately 600 rpm is not required.
The following figure suggests typical requirements for gear
configuration. Ideal dimensions may not be available in stock
gears, but the figure serves as a guide for selection of the best
stock gear available.
A. Dimension of tooth top, equal to or greater than D.
B. Height of tooth, equal to or greater than D.
C. Space between teeth, equal to or greater than D.
D. Diameter of pole piece, typically 0.106" (2.69 mm).
E. Clearance, as
close as possible,
typically 0.01"
(0.25 mm) or less.
F. Gear thickness,
equal to or greater
.493"
than 2 times D.
B
E
D
P
S
I
E
C
N
K
S
U
O
P
R
S
S
A
N
D
C
A
F
Recommended Gears
Gear Dia. Bore Pitch PPR 7143
16002070083 3-7/8" 1/2" 16 60 X
16002070216 5-1/2" 1-1/8" 11 60 X
16002070217 5-1/2" 1-3/8" 11 60 X
16002070218 5-1/2" 1-5/8" 11 60 X
16002600314 5-1/2" 1-7/8" 11 60 X
16002600315 5-1/2" 2" 11 60 X
16002600316 5-1/2" 2-1/8" 11 60 X
16002600317 5-1/2" 2-1/4" 11 60 X
16002600318 5-1/2" 2-3/8" 11 60 X
16002600319 5-1/2" 2-1/2" 11 60 X
16002600320 5-1/2" 2-7/8" 11 60 X
Model No. Description
714300-001 1/2" diameter x 1-3/4"
plastic probe, bracket, cable
assembly
714300-002 5/8" diameter x 2-1/4"
stainless steel probe, cable
assembly
For zero speed sensors, see
51Z, 53Z Pickups
2.
115
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