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BTL5-A11-M/U_ _ _ _-P-SA167-S 32
Micropulse Linear Transducer in Profile Housing
2
Function and Characteristics
2.1
Characteristics
Micropulse transducers feature:
—
Very high resolution, repeatability
and linearity
— Immunity to shock, vibration,
contamination and electrical noise
An absolute output signal
—
—
IP 67 per IEC 60529
2.2
Function
The Micropulse transducer contains
a tubular waveguide enclosed by an
extruded aluminum housing. A
magnet attached to the moving
member of the machine is moved
across the top of the housing and
its position constantly updated.
The magnet defines the measured
position on the waveguide. An inter-
nally generated INIT pulse interacts
with the magnetic field of the magnet
to generate a magnetostrictive tor-
sional wave in the waveguide which
propagates at ultrasonic speed.
The torsional wave arriving at the
end of the waveguide is absorbed in
Notch on housing to mark the beginning of the stroke range
Current position of
magnet
Micropulse Transducer
Fig. 2-1: Basic arrangement
the damping zone. The wave arriv-
ing at the beginning of the
waveguide creates an electrical
signal in the coil surrounding the
waveguide. The propagation time of
the wave is used to derive the posi-
tion. The corresponding value is
output as a voltage with rising and
falling characteristic. This process
takes place with measuring high
precision and repeatability within the
stroke range defined as nominal
stroke length.
On both ends of the nominal stroke
length is an area which provides an
unreliable signal, but which may be
entered.
The electrical connection between
the transducer and the processor or
controller is made with a cable,
which is fixed to the transducer via
a connector.
Dimensions for installing the
Micropulse transducer and for the
magnets and control arm are found
on ➥ ➥ ➥ ➥ ➥ pages 4 and 5.
Nominal stroke =
Measuring range
Moving ma-
chine part
Machine
2.3
Available stroke lengths
and magnets
To provide for optimum fit in any
application, a wide range of stan-
dard stroke lengths and magnets in
various form factors are available.
Magnets and control arms must
therefore be ordered separately.
The following nominal stroke
lengths are available:
stroke lengths
increments
[mm]
[mm]
50
... 1000
50
1000
...
2000
100
2000
...
4000
250
Other stroke lengths on request.
3
Installation
3.1
Transducer installation
Ensure that no strong electrical or
magnetic fields are present in the
immediate vicinity of the trans-
ducer.
Any orientation is permitted. The
supplied mounting brackets and
cylinder head screws allow the
transducer to be mounted on a flat
machine surface. A sufficient quan-
tity of mounting brackets is sup-
plied. These should be evenly
spaced (➥ ➥ ➥ ➥ ➥ Figs. 3-1 and 3-5). The
recommended spacing for long
transducers and extreme conditions
(e.g. strong shock or vibration):
A = 80 mm; spacing between the
individual brackets B = 250 mm.
The supplied isolation bushings are
used to electrically insulate the
transducer from the machine
(➥ ➥ ➥ ➥ ➥ Fig. 3-1and 3-5 and chapter 5.6
Noise elimination).
The Micropulse transducer in profile
housing is suitable both for floating,
i.e. non-contacting magnets
(➥ ➥ ➥ ➥ ➥ Page 4) and for captive magnets
(➥ ➥ ➥ ➥ ➥ Page 5).
english
3
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