Function - Balluff BTL6-V1 E-M Series User Manual

BTL6-V1 _ E-M _ _ _ _ -A/B/Y/Z(8)-S115
Micropulse Transducer - Rod Style
3
Construction and function
BTL6...S115
12.8
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: BTL6... transducer, construction and function
3.1 Construction
Electrical connection: The electrical connection is made
via a connector (see Type code breakdown on page 16).
BTL housing: Aluminum housing containing the
processing electronics.
Mounting thread: We recommend assembling these
transducers on the fastening screw thread:
– BTL6-...-A/B: M18×1.5
– BTL6-...-Y/Z: 3/4"-16UNF
The transducer 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 14).
Only with BTL6-V12E...: A minimum spacing (L) of 65 mm
must be maintained.
L
Fig. 3-2: Spacing between magnets
Nominal length: Defines the available measuring range.
Rods with various nominal lengths from 25 mm to
4012 mm are available depending on the version:
– Ø 10.2 mm: Nominal length from 25 mm to 4012 mm
– Ø 8 mm: Nominal length from 25 mm to 1016 mm
6 english
Mounting surface
B: 30-1 mm
Z: 2"-0.04"
1)
Magnet 2)
Thread size
0.5 Ø 25
B: M18x1.5
Z: 3/4"-16UNF
71 25
Mounting surface
G
Thread M4x4/6 deep
No thread
Damping zone 1)
60
Nominal length =
Measuring range
A: 30-1 mm
Y: 2"-0.04"
2)
1)
Thread size
A: M18x1.5
Y: 3/4"-16UNF
Damping zone: Area at the end of the rod that cannot be
used for measurements, but which may be passed over.
3.2

Function

The BTL6 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.
This information is transferred via the EtherCAT
EtherCAT is an industrial bus system based on the
®
physical layer of the Ethernet (see www.ethercat.org).
45
46
interface.
®