Construction And Function; Construction; Function - Balluff BTL7-A Serie Betriebsanleitung

BTL7-A/C/E/G5 _ _ -M _ _ _ _ -HB/WB-KA_ _/K_ _/FA_ _/F_ _
Micropulse Transducer - Rod Style
3

Construction and function

BTL7...HB/WB-...
Axial
Mounting surface
55 60
29.5 0.5 / Ø 25
3)
Ø 5 for hook spanner
Ø 58–62
BTL7...HB/WB-...
Radial
M18x1.5
24
Fig. 3-1: BTL7...HB/WB... transducer, construction and function
3.1

Construction

Electrical connection: The electrical connection is made
via a cable and permanent (see Type code breakdown on
page 24).
Housing: Housing containing the processing electronics.
Mounting thread: We recommend assembling these
transducers on the mounting thread:
– BTL7-...-HB-...: M18×1.5
– BTL7-...-WB-...: 3/4"-16UNF
The transducer 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 stroke lengths from 25 mm to
7620 mm are available depending on the version.
Damping zone: Area at the end of the rod that cannot be
used for measurements, but which may be passed over.
www.balluff.com
HB: 30-1 mm
WB: 2"-0.04"
Damping zone
Nominal length =
1)
Measuring range
2)
Magnet
Thread size:
HB: M18×1.5
25
WB: 3/4"-16UNF
45
1)
60
Thread
M4x4/6 deep
1) Unusable area
2) Not included in scope of delivery
3) Connecting option for cable protection system
with M18 (see Accessories on page 23)
3.2

Function

The Micropulse Transducer 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 speed.
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 60
45
english 7