Construction And Function; Construction; Function - Balluff BTL7-P511-M serie Betriebsanleitung

BTL7-P511-M _ _ _ _ -A/B/Y/Z(8)-S32/S115/S135/KA _ _ /FA _ _
Micropulse Transducer - Rod Style
3

Construction and function

BTL7...cable
Ø max. 7
BTL7...S115
12.8
13.5
1) Unusable area
2) Not included in scope of delivery
Version D1
...-A/B/Y/Z-... 10.2 mm
...-A8/B8/Y8/Z8-... 8 mm
...
Fig. 3-1: BTL7 transducer, construction and function
3.1

Construction

Electrical connection: The electrical connection is made
via a cable or a connector (see Type code breakdown on
page 21).
Housing: Aluminum housing containing the processing
electronics.
Mounting thread: We recommend assembling the
transducer on the fastening screw thread:
– BTL7-...-A/B: M18×1.5
– BTL7-...-Y/Z: 3/4"-16UNF
The transducers with Ø 10.2 mm have 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 18).
Nominal length: Defines the available measuring range.
Rods with various nominal lengths from 25 mm to
7620 mm are available depending on the version:
– 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
Mounting surface
B: 30-1 mm
Z: 2"-0.04"
1)
BTL7...S32/S135
0.5 Ø 25
71 25
11
G
Thread M4x4/6 deep
No thread
Damping zone 1)
Nominal length =
Measuring range
Magnet 2)
Thread size
B: M18x1.5
Z: 3/4"-16UNF
Mounting surface
A: 30-1 mm
Y: 2"-0.04"
2)
1)
Thread size
25
71 A: M18x1.5
Y: 3/4"-16UNF
3.2

Function

The BTL7 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 externally 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. 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
60
View of
BTL7...S32
LED 1
LED 2
45
46
english 7