Balluff BTL7-A/C/E/G5 M J-DEXC-TA12 Serie Betriebsanleitung Seite 44

BTL7-A/C/E/G5_ _-M_ _ _ _-J-DEXC-TA12
Magnetostrictive Linear Position Sensor – Rod Style
3
Construction and function (continued)
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.
Component overview
1)
Float
Pressure housing
2)
Magnet
O-ring flange (not
visible)
3)
Adapter
1) For use in liquid-level applications,
not included in scope of delivery (see Section 12.1 Floats)
2) Not included in scope of delivery (see Section 12.2 Magnets)
3) 1/2"-14 NPT to M20, optional (see
4) Modified 1/2"-14 NPT according to FM 3615, 3.3.3, D, 1
5) M6x45 A4 hexagon socket screws (6x, included)
(replacement screw kit: BTL7-A-FK01-E-J-DEX).
6) Wiring information (see Section 4.5 Electrical connection)
7) Optional (see Section 12.3 Calibration device)
10 english
External housing GND
Housing cover
O-ring
4)
Conduit entry
Internal housing GND
Location of
order code for
replacement
electronics module
Section 12.5 Conduit adapter)
Type of protection "db" and "t"
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 a 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 with rising or falling gradient.
Cover secondary retaining
screw
5)
Housing screws
Electronics module (including measuring range)
Connection terminal
Calibration device
Flameproof enclosure
Retaining screws
6)
Housing cover
7)