Construction And Function; Construction; Function; Number Of Magnets - Balluff BTL5-H1-M-P-S94 Serie Manual De Instrucciones

BTL5-H1_ _ -M _ _ _ _ -P-S94
Magnetostrictive Linear Position Sensor – Profile Style
3

Construction and function

1)
~20 106
~80
Mounting clamps with insulating bushes
and ISO 4762 M5x22 cylinder head screws,
max. tightening torque 2 Nm
Fig. 3-1: BTL5..., construction
3.1

Construction

Electrical connection: The electrical connection is made
via a cable (see Type code on page 20).
Housing: Aluminium housing containing 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 16).
Nominal length: To optimally adapt the BTL to the
application, nominal lengths from 50 mm to 4000 mm are
available.
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 internally generated INIT pulse interacts with the
magnetic field of the magnet to generate a torsional wave
in the waveguide which propagates at ultrasonic velocity.
www.balluff.com
Nominal length =
Measuring range
Groove 3)
Magnet
BTL5-P-3800-2
DIN912 M5 × 22
~250
1) Unusable area
2) Not included in scope of delivery
3) Groove on the top side of the profile marks the start of measuring range
1)
73
2)
15
~250 ~80
The component of the torsional wave which arrives at the
end of the waveguide is absorbed in the damping zone to
prevent reflection. The wave generated at position of the
magnet returns to the head end of the BTL where a coil
converts the wave into an electrical signal. The travel time
of the wave is used to calculate the position at a resolution
of 5 µm. This is done with high precision and reproducibility
within the measuring range designated as the rated length.
3.3

Number of magnets

Up to 4 magnets can be used. The distance (L) between
the magnets must be at least 65 mm.
L
Fig. 3-2: Distance between the magnets
50
68
L L
english 7