Balluff BTL7-A Série Notice D'utilisation page 35

BTL7-A/C/E/G5 _ _ -M _ _ _ _ -K(8)-SR32/SR115/_ _ _
Magnetostrictive Linear Position Sensor – Rod Style
3
Construction and function
BTL7...-SR32
34 40-1
6
1)
Magnet
Mounting
25
surface
20.5
BTL7...-SR115
20.5
Fig. 3-1: BTL7-...-K(8)-..., construction and function
3.1 Construction
Electrical connection: The electrical connection is made
via a cable or a connector (see Type code on page 25).
Housing: Housing containing the processing electronics.
Fastening: For secure fastening, tighten the BTL with
cylinder screws (ISO 4762, M6 × 16 - A2-70) at all
6 mounting holes (see Fig. 3-1). All screws must be
tightened with 3.5 Nm.
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 22).
Nominal length: Defines the available measuring range.
Rods with various nominal lengths from 25 mm to
7620 mm are available depending on the version of the BTL:
– Ø 10.2 mm: Nominal length from 25 mm to 7620 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
Damping zone
Nominal length =
Measuring range
2)
Version D1
...-K-... 10.2 mm
...-K8-... 8 mm
BTL7... cable
20.5
1)
60
G
G
Thread
M4x4/6 deep
No thread
Unusable area
1)
Not included in scope of delivery
2)
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. Depending
on the version, this information is made available as a
voltage or current output with a rising or falling gradient.
Ø 79
Ø 64
6 holes to fasten
the BTL
english 7