Construction And Function; Construction; Function; Number Of Magnets - Balluff BTL5-H1_ _-M_ _ _ _-A/B/Y/Z-S94-Serie Betriebsanleitung

BTL5-H1 _ _ -M _ _ _ _ -A/B/Y/Z(8)-S94
Magnetostrictive Linear Position Sensor – Rod Style
3

Construction and function

Mounting surface
Electrical connection
BTL5...B/Z-S94
Version D1
...-A/B/Y/Z-... 10.2 mm
...-A8/B8/Y8/Z8-... 8 mm
Fig. 3-1: BTL5..., construction
3.1

Construction

Electrical connection: The electrical connection is made
via a cable (see Type code on page 19).
Housing: Housing containing the processing electronics.
Fastening: We recommend assembling the following
BTLs on the mounting thread:
– BTL5-...-A/B: M18×1.5
– BTL5-...-Y/Z: 3/4"-16UNF
The BTL with Ø 10.2 mm has an additional thread at the
end of the rod to support larger nominal lengths.
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: Defines the travel/length range available.
Rods with various nominal stroke lengths from 25 mm to
4000 mm are available depending on the BTL version.
– Ø 10.2 mm: Nominal length from 25 mm to 4000 mm
– Ø 8 mm: Nominal length from 25 mm to 1016 mm
Damping zone: Area at the end of the rod that cannot be
used for measurements, but which may be passed over.
www.balluff.com
B: 30 -1 mm
Z: 2" -0.04"
Nominal length =
Measuring range
2)
Magnet 1)
Thread size:
B: M18x1.5
Z: 3/4"-16UNF
BTL5...A/Y
G
Thread
M4x4/6 deep
No thread
2)
Damping zone
Mounting surface
A: 30 -1 mm
Y: 2" -0.04"
Thread size:
A: M18x1.5
Y: 3/4"-16UNF
3.2

Function

The BTL contains the waveguide which is protected by an
outer stainless steel tube (rod). 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.
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 at a resolution
of 5 µm. This is done with a high level of precision and
reproducibility within the measuring range indicated as the
nominal 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.
Fig. 3-2: Distance between the magnets
1) Not included in the scope of
delivery
2) Unusable area
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