Construction And Function; Function - Balluff BTL6-P111-M0950-A1-S115 User Manual

_
BTL6-P11 -M _ _ _ _ -A1-S115
Magnetostrictive Linear Position Sensor – Profile Style
3

Construction and function

73 2)
21
~60
Fig. 3-1: BTL6..., construction
3.1 Construction
Electrical Connection: The electrical connection is made
using a connector.
Housing: Aluminum, contains the processing electronics.
Magnet: Defines the position to be measured on the
waveguide. Magnets are available in various models and
must be ordered separately (see Accessories on
page 13).
Nominal length: The following standard nominal lengths
are available for compatibility with any application:
BTL6-P11_-...
6 english
Nominal length
= Measuring range
Magnet
BTL6-A-3801-2
1)
Mounting cuff
BTL6-A-MF03-K-50
~250 ~250
Nominal length
50...4012 mm
73 2)
1)
Ø 5.5
~60
1) not included in scope of delivery
unusable area
2)
3.2

Function

The BTL contains the waveguide which is protected by an
aluminum housing. A magnet is moved along the
waveguide. This magnet is connected to the system part
whose position is to be determined. The magnet defines
the position to be measured on the waveguide.
An externally generated INIT pulse interacts with the
magnetic field of the magnet to generate a torsional wave
in the waveguide which propagates at ultrasonic velocity.
The component of the torsional wave which arrives at the
end of the waveguide is absorbed in the damping zone to
prevent reflection. The component of the torsional wave
which arrives at the beginning of the waveguide is
converted by a coil into an electrical signal. The travel time
of the wave is used to calculate the position. The position
value corresponds to the travel time of the torsional wave
and is output as digital time information between the start
and stop pulses.
The evaluation may relate to the rising or falling edge. This is
done with a high level of precision and reproducibility within
the measuring range indicated as the nominal length.
Init
Start
Stop
T
T
Fig. 3-2: Time/distance measuring principle
Slot
50
60