Number Of Magnets; Led Display - Balluff BTL7-P511-M-A/B/Y/Z-NEX-S32/KA Serie Notice D'utilisation

BTL7-P511-M _ _ _ _ -A/B/CD/Y/Z(8)-NEX-S32/KA _ _
Micropulse Transducer - Rod Style
3
Construction and function (continued)
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 velocity.
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. 3-1: Time/distance measuring principle
10 english
3.3

Number of magnets

Up to 16 magnets can be used. The distance (L) between
the magnets must be at least 65 mm.
Fig. 3-2: Distance between the magnets
3.4

LED display

LED 1 LED 2
Fig. 3-3: Position of the BTL7 LED displays
LED 1
Normal function
Green
Magnet is within the limits.
Error
Red
No magnet or magnet outside the limits.
LED 2
Normal function
OFF
Valid Init signal.
Flashing red Init error
Missing or invalid Init signal and LED 1 is off.
Ignition protection
"ec" and "tb"