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5-4
Measurement tasks
* If shaft speed < 0,1 Hz (= 6 rpm),
then change the 'Keyphaser - Timeout'
setting in the Device setup (p. 2-23).
Typical installation for a vibration mea-
surement with simultaneous recording
of the rotational speed.
RPM measurements
The Laser-Trigger Sensor (VIB 6.631) is used for RPM measurement
and as a trigger encoder. The sensor detects the signals optically, i.e.
without contacting rotating machine parts during the measurement.
Red laser light is emitted from the sensor head and strikes a
measurement mark on the rotating shaft. The measurement mark can
be light amplifying (e.g. reflective film VIB 3.306) or light attenuating
(a black, high contrast line on a light-colored surface). Each time
the sensor detects a difference in brightness, it sends an electric
impulse. VIBXPERT calculates the shaft RPM* based on the repeat
rate of the pulses.
Reflective tape
(VIB 3.306)
Laser trigger sensor
(VIB 6.631)
Laser-Trigger Sensor (VIB 6.631)
Sensor with magnetic holder
(VIB 6.142R + VIB 3.420)
R R
R
Trigger stand
(VIB 6.632)
Trigger cable
(VIB 5.432-2.9)
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