104
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Magnetostrictive Linear Displacement Transducer
The MagneRule Plus™ magnetostrictive linear displacement
transducer provides highly accurate absolute position
measurement of displacement up to 120 inches (3 meters).
The sensor also measures velocity, giving feedback of both
position and velocity simultaneously.
Operation is based on accurately measuring the distance
from a predetermined point to a magnetic field produced by
a movable permanent magnet. The design and durability of
the sensor make it ideal for measuring position of moving
machine members.
Excellent Performance
A marked improvement over potentiometers for long stroke
position measurement, the MagneRule Plus™ possesses
exceptional linearity, even over lengths up to 120 inches (3
meters), with repeatability up to 0.002% of the
measurement range. By utilizing magnetostrictive
technology, MagneRule Plus, requires no contact between
parts that cause friction or premature wear, offering high
reliability and extended life. Good stroke-to-length ratio
provides for a more compact long stroke position sensor.
Hostile Environments
MagneRule Plus™ operates in hostile industrial
environments with high temperatures and working
pressure. The sensor probe is pressure-sealed with an “O”
ring to operate in hydraulic fluids up to 5000 psi. Integral
electronics are protected against contamination from dust.
Selectable Inputs/Outputs
MagneRule Plus is powered by ±15 VDC or 24 VDC. By
providing an absolute output, no data is lost should power
be interrupted. The long stroke sensor offers a universal
analog position output, as well as a velocity output.
Therefore, one unit can be stocked for multiple
applications.
Easy Installation
The design of the MagneRule Plus™ permits simple
mounting and hookup. Electronics are self-contained in the
sensor head, eliminating the need for additional electronic
packages. For external sensor installation, special mounting
kits and various magnet options are available.
MagneRule
Plus™
105
Technology Overview
I
in
Actual Eo
to wave guide
(P )
from mode
converter
Electronically
conditioned
E (P )
PWM signal generated
using P and P
o
Time
Start pulse
Stop pulse
To magnetic ring position
Pulse duration proportional
start
stop
start stop
Protective stainless
steel tube
Longitudinal
magnetic field
Noncontacting magnet
carrier ring
Solid wire
wave guide
Current pulse
input ( in)
I
Torsional deformation
of waveguide
S
N
S
N
N
S
Mode converter
output E
o
Bias magnet
Mode converter
End damper
MagneRule
Plus™
Magnetostrictive Linear
Displacement Transducer
Operation
A trigger coil periodically sends short duration current
pulses (“start” pulses) down the waveguide. When the
magnetic field accompanying the current pulses intersects
the magnetic field of the movable ring, magnetostriction
causes a momentary torsional strain in the wire. This strain
travels back down the wire and is converted back to an
electrical pulse (“stop” pulse) in the head. By measuring the
time difference between the start and stop pulses, the
position of the magnet ring can be precisely determined.
Universal Analog Outputs
MagneRule Plus™ translates this time-based position
measurement into an analog output signal. A user selectable
0 to 10 VDC voltage (either low or high frequency
response) or a 4-20 mA current (3-wire) output is available
in either forward or reverse slope signals. Additionally,
velocity of the moving magnet ring (up to 10 in/sec) is
generated by differentiating the position signal.
Custom Designs
For OEM applications with unique requirements,
MagneRule Plus™ can be tailored to specific length and
mounting requirements. Schaevitz® also offers this sensor
with alternate threading, special magnets, and tailored
electronics.
Hardware
MagneRule Plus consists of a nonmagnetic, pressure-sealed
stainless steel tube (probe) welded to an enclosed stainless
steel base (head). The probe contains a stretched
magnetostrictive wire, and the head contains the
transducer's control electronics. A permanent magnet ring
serving as a movable position marker slides over the outside
of the tube.
State-of-the-Art Electronics
By utilizing the latest in surface mount technology in the
design of its electronics, MagneRule Plus™ provides state-
of-the-art features such as user-selectable inputs and
outputs in a smaller electronics package.
106
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Outputs
User Selectable Analog Output Signals
MagneRule Plus™ offers a universal analog output signal
that is user-selectable. (Sensor gives feedback of both
position and velocity simultaneously.)
Users may choose one or all of the following analog
outputs when installing the sensor.
Displacement Analog Voltage Output
❏0 to 10 VDC or 10 to 0 VDC at 10 Hz
❏0 to 10 VDC or 10 to 0 VDC at 100 Hz
The standard output, used for most commercial data AC
aquisition systems, is derived from a 4-pole, 10 Hz low
pass filter. Output provides low noise and low ripple. For
relatively fast servo system applications, there is a higher
response output derived from a 3-pole, 100 Hz filter which
has low phase lag at 10 Hz.
Output voltage slope polarity may be reversed by
grounding a selected wire. Slope polarity change combined
with the standard analog outputs gives 4 different sets of
output characteristics: 0 to 10 VDC or 10 to 0 VDC at 10
Hz and 0 to 10 VDC or 10 to 0 VDC at 100 Hz.
Slope polarity change is useful when it is necessary to
reverse the operating sense of the measurement, as in “top-
down” liquid level applications when the magnet/float at
the end of the MagneRule Plus™ is equivalent to minimum
level or empty. Other applications include “pull” instead of
“push” hydraulic cylinder installations and machine tool
motion control systems.
Displacement Analog Current Output
❏4-20 mA or 20-4 mA at 10 Hz
This 3-wire, 4-20 mA current output is derived from a
4-pole, 10 Hz filter.
It is utilized in industrial and process control applications
where there are long cable runs between loop power
supply, readout equipment or PLC and the sensor.
Output slope polarity can be reversed by grounding a
selected wire, giving two position outputs: 4-20 mA or 20-4
mA at 10 Hz cutoff frequency.
Velocity
MagneRule Plus™ offers an uncalibrated velocity output
derived from the position output. This analog voltage is
normally used for rate feedback stabilization in second
order servo systems. Because it is the derivative of the
position signal, it is only useful over a limited range of
velocities, typically from 0.05 inches per second to 10
inches per second. Consult factory for other ranges.
Performance Specifications
Standard Ranges .............. 6, 12, 18, 24, 30, 36, 48, 60, 72,
84, 96, 108 and 120 inches
(metric units also available)
Input Power ...................... ±15 VDC ±10% (70 mA) or
+24 VDC ±10% (90 mA)
(inputs are user-selectable)
Output
Displacement ................. 0 to 10 or 10 to 0 VDC at 2 mA
max or 4 to 20 or 20 to 4 mA
(600 Ohm max loop resistance
at 24 V) (outputs are user-
selectable)
Velocity ........................... 1 V/inch/sec nominal (10 V
max)
Nonlinearity ...................... 0.05% of full scale output
(max)
Nonrepeatability ............... 0.002% of full scale (max)
Resolution ......................... Up to 0.002% of full scale
Hysteresis .......................... 0.001 inches (max)
Frequency Response
Low Noise....................... -3 dB at 10 Hz, -60° phase shift
at 10 Hz
Servo ............................... -3 dB at 100 Hz, -15° phase
shift at 10 Hz (for other
frequencies consult factory)
Update Frequency
Range (inches) ............... (kHz)
6-12.................................. 6.250
13-29................................ 3.125
30-63................................ 1.583
64-120 ............................. .781
Operating Temperature Range
Probe............................... -40° to 85°C
Head................................ 0° to 70°C
Storage Temperature
Range ................................. -40° to 100°C
Temperature Coefficient .. 0.007% of full scale per °C
Span Adjustment Range .. 20% of nominal range
Zero Adjustment Range... 20% of nominal range
Ripple
Low noise (6 to 120") .... Less than 2 mV rms
Servo (6 to 63") .............. Less than 2 mV rms
Servo (64 to 120") .......... Less than 10 mV rms
Physical Specifications
Probe.................................. 304SS wetted parts, 5000 psi
sealed (340 bar)
Cover.................................. Anodized aluminum
Cable .................................. 10 feet (3m) PVC jacketed
O-rings ............................... Viton®
Magnet Ring ...................... Ertalyre*
Viton® is a registered trademark of DuPont
Specifications
MagneRule
Plus™
107
MagneRule
Plus™
Magnetostrictive Linear
Displacement Transducer
Dimensions in (mm)
Ø1.72
(Ø43.69)
4.40 Max
(111.76) 2.0
(50.8) ref 2.5
(63.5) ref
0.85
(21.59)
Zero
adjustment
20% of
nominal
range
Span adjustment
20% of nominal
range
Viton O-Rings
Measuring Range
+ 4.50 (114.30) Max
0.43
(10.92)
Ø.405
(Ø10.287)
1.290
(32.77)
3/4-16UNF2A
Magnet Ring
Assembly
0.36 Max
(9.14)
A
A
Pin Connector Termination
Span Trim
Potentiometer
Sealing Screw
Zero Trim
Potentiometer
Sealing Screw
View A-A
A
1.29 dia.
(32.8)
0.53 dia.
(13.5)
0.152 (3.9)
Holes equally
spaced on
0.94 dia. (23.9)
bolt circle
Wt. 13.32 ±. 2g
Ring Magnet Assembly
Pin Connections
A+15 V IN/+24 V IN
BCommon Ground
CAnalog Ground
D-15 V IN
EV Out, 100 Hz
FV Out, 10 Hz
GVelocity
HCurrent
JReverse (Connect to red
or cap off with no
connection for standard
slope polarity) (Connect
to black for reverse
slope polarity)
KNo connection
Cable Termination
View A-A
A
1.29 dia.
(32.8)
0.53 dia.
(13.5)
0.152 (3.9)
Holes equally
spaced on
0.94 dia. (23.9)
bolt circle
Wt. 13.32 ±. 2g
Ring Magnet Assembly
Cable
Color Function
Brown V Out, 100 Hz
Blue Analog Ground
Black Common Ground
Violet Current
Green V Out, 10 Hz
Orange Reverse (Connect
to red or cap off
with no connection
for standard slope
polarity) (Connect
to black for reverse
slope polarity)
White -15 V IN
Red +15 V IN/+24 V IN
Yellow Velocity
A
A0.86
Max
(21.84
Ø1.72
(Ø43.69)
4.40 Max
(111.76) 2.0
(50.8) ref 2.5
(63.5) ref
0.85
(21.59)
Zero
adjustment
20% of
nominal
range
Viton O-Rings
Measuring Range
+ 4.50 (114.30) Max
0.43
(10.92)
Ø.405
(Ø10.287)
1.290
(32.77)
3/4-16UNF2A
Magnet Ring
Assembly
Span adjustment
20% of nominal
range
10 ft (3 m)
Span Trim
Potentiometer
Sealing Screw
Zero Trim
Potentiometer
Sealing Screw
108
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Accessory Mounting Kit and Float Assembly
Mounting Kit
For simplified external sensor
installation, mounting kits are
available that include
appropriate mounting and
support brackets, and an
open magnet assembly.
To order specify kit:
MK-1 (For lengths of <4 feet)
MK-2 (For lengths >4 feet)
Transducer
Bracket Jam Nut
3/4 -16 UNF-2A
0.750 (19.05)
1.94
(49.28) Two Extra Brackets
Provided in
Mounting Kit
MK-2
Retainer band
Tube bracket
Magnet Ring/bracket
Assembly
Note: For MK-2 kits, three tube brackets should be
spaced so that each distance x is approximately equal
x x x
Open Magnet Ring
0.12 Dia. (3.05)
(4 Places)
#6-32 UNC-28
(2 places)
0.27
(6.9) 0.75
(19)
0.27
(6.9)
1.75
(44.5)
0.88
(22.4)
0.12
(3.05)
1.72
(43.7)
1.00
(25.4)
1.73
(43.9)
1.38
(35.1)
0.88
(22.4)
0.12
(3.05)
0.50
(12.7)
1.75
(44.5)
0.26 Dia.
(6.60)
0.12 Dia.
(3.0)
0.88
(22.4)
▼
▼
▼▼
▼
▼
▼▼
0.31 Thick (7.87)
0.15 Dia. (3.81)
4 Places on 0.94
Radius (23.9)
ID = 0.53
(13.5)
OD = 1.29
(32.8) 0.42
(10.7)
Open Magnet
Ring
Screw 6-32
Split Washer
Magnet Bracket
0.257 Dia. (0.653)
1.94
(49.28)
Mounting Kit Assembly in (mm)
Magnet Bracket
Retainer Band
Tube Bracket
Magnet Ring/Bracket
Assembly
MagneRule
Plus™
109
Float Kit
MagneRule Plus™ can
monitor the actual fluid
level in a container with
the addition of a float
kit. The MagneRule's
stainless steel rod is
positioned directly into
the fluid. A spherical
float containing an
integrated permanent
magnet measures the
fluid level. The float kit
includes a spherical
float, retaining collar,
and transducer bracket.
The entire assembly is
mounted vertically.
To order specify: FK-1
MagneRule
Plus™
Magnetostrictive Linear
Displacement Transducer
Spherical Float
0.75 ± 0.03
(19.05 ± 0.76)
Spherical Float
Hex Base
South
62890124-000
South End
Retaining Collar
Jam Nut
3/4 -16
Transducer
Bracket
1.94
(49.28)
Float Kit Assembly in (mm)
Spherical Float
Retaining Collar
2.00
(50.8)
0.55
(14)
0.87
(22.1)
0.41
(10.4)
0.37
(94)
110
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Document Fax Back: 916/431-6541 Europe Tel: (01753) 537622
Or dering Information
How to Order
A standard ring magnet assembly, nonmagnetic mounting
screws and hole-location templates are shipped with each
MagneRule Plus™. When ordering please complete model
number by specifying unit ouput and measurement range.
Ordering Example:
Model Number MRU-3000-012 is a MagneRule Plus™
with a standard (V/in) calibration, standard output,
standard cable termination, standard base, and a standard
12 inch range.
MRU - 3000— 012
(1)
Calibration
3V/in (standard)
4(1) V/cm (optional)
Output
0User-selectable analog outputs (standard)
Termination
0Cable Termination (standard)
2Connector termination (optional)
Base
0Imperial mounting hole dimensions (standard)
1Metric mounting hole dimensions (optional)
Unit Range(1)
Specify range from 6 inches (006) or 15 cm (015) to 120 inches (120) or 305 cm (305)
Code Inches Code Centimeters
006 6 inches (standard) 015 015 cm (standard)
012 12 inches (standard) 031 030 cm (standard)
018 18 inches (standard) 045 045 cm (standard)
024 24 inches (standard) 061 061 cm (standard)
030 30 inches (standard) 076 076 cm (standard)
036 36 inches (standard) 091 091 cm (standard)
048 48 inches (optional) 122 122 cm (optional)
060 60 inches (optional) 152 152 cm (optional)
072 72 inches (optional) 183 183 cm (optional)
084 84 inches (optional) 213 213 cm (optional)
096 96 inches (optional) 244 244 cm (optional)
108 108 inches (optional) 274 274 cm (optional
120 120 inches (optional) 305 305 cm (optional)
(1) For metric calibration (V/cm), unit range is specified in centimeters.
MagneRule
Plus™
