Balluff BTL6-V1 E-M Series, User Manual

Page: 23 / 85

6 english
Fig. 3-1:
~60 ~60 60
50
Ø 5.5
Ø 30
18
37
55-4
M12x1
73
21
73
~250 ~250
BTL6... transducer, construction
3.1 Construction
Electrical connection: The electrical connection is made
via a connector (see Type code breakdown on page 15).
BTL housing: Aluminum 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 13).
Nominal length: To optimally adapt the transducer to the
application, the following nominal lengths are available:
Nominal length Grading
50 to 4012 mm 25 mm
Other nominal stroke lengths: 130, 160, 230, and 360 mm
(corresponds to the standard lengths of potentiometric
sensors)
3
Construction and function
1) Unusable area
2) Not included in scope of delivery
1)
2)
3.2 Function
The BTL6 transducer 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 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.
This information is transferred via the EtherCAT
®
interface.
EtherCAT
®
is an industrial bus system based on the
physical layer of the Ethernet (see www.ethercat.org).
Groove
Bracket
BTL6-A-MF03-K-50
Nominal length =
Measuring range
1)
BTL6-A-3801-2
magnet
2)
BTL6-V1 _ E-M _ _ _ _ -A1-S115
Micropulse AT transducer in round profile housing