BTL5-S1_ _-M/U_ _ _ _-K-SR32/K_ _
Micropulse Linear Transducer - Rod Style
3
english
2.1
Characteristics
Micropulse transducers feature:
–
High data security: Output data
are checked for validity and plau-
sibility in the µC.
–
Very high resolution, repeatability
and linearity
–
Measurement range monitoring
with "Out of Range" Bit 2
21
–
Immunity to shock, vibration, and
contamination
–
An absolute output signal
–
BTL to controller cable lengths
up to 400 m
–
Pressure rated to 600 bar
–
Enclosure rating per IEC 60529:
Connector version IP 67
Cable version IP 68 (5 bar / 48 h)
2.2
Function
The transducer contains a tubular
waveguide enclosed by an outer
stainless steel rod. A magnet at-
tached to the moving member of
the machine or to the cylinder pis-
ton is moved over the rod 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 mag-
net to generate a magnetostrictive
torsional wave in the waveguide
which propagates at ultrasonic speed.
The torsional wave arriving at the
end of the waveguide is absorbed in
the damping zone. The wave arriv-
ing at the beginning of the wave-
guide creates an electrical signal in
the coil surrounding the waveguide.
The propagation time of the wave is
used to determine the position,
which in turn is output over the
RS 485/422 interface in the form of
synchronous serial data. This is
done with high precision and re-
peatability at the selected resolution
within the range given as the nomi-
nal stroke length.
At the rod end is a damping zone,
within which no reliable signal is
available, but which may be entered
by the magnet.
The electrical connection between
the transducer, the controller and
the power supply is via a cable,
2
Function and Characteristics
which depending on the version is
either fixed or connected using a
female connector.
Dimensions for installing the
Micropulse transducer:
➥
➥
➥
➥
➥
Fig. 3-2
Dimensions for installing the mag-
net:
➥
➥
➥
➥
➥
Fig. 3-4
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 must therefore be ordered
separately.
The following nominal stroke
lengths are available:
Stroke lengths
[mm]
Increments
[mm]
50 ... 500
25
500 ... 1000
50
1000 ... 2000
100
2000 ... 4000
250
Other stroke lengths on request.
3
Installation
3.1
Mounting
When possible, use non-magnetiz-
able material for attaching the trans-
ducer and magnet ring.
➥
➥
➥
➥
➥
Fig. 3-1.
When attaching the transducer to
magnetizable materials, appropri-
ate measures must be taken to
protect against magnetic disturb-
ances
➥
➥
➥
➥
➥
Fig. 3-1. Note the
recommended distance of the
transducer and cylinder from
strong, external magnetic fields.
Fig. 3-1: Mounting
➀
-
➂
for magnetizable materials
➃
for non-magnetizable materials
a = Spacer made of non-mag-
netizable materials
b = Magnet
non-magnetizable material
