FUNCTION
The sensor acquires the signal optically using a red laser. The
laser beam exits from the sensor head and hits a measuring
mark on the rotating shaft. The measuring mark can be
light-increasing (e.g., reflective foil VIB 3.306) or light-re-
ducing (contrast mark, e.g., black line on bright surface).
Whenever the sensor acquires a brightness difference, it
outputs an electrical pulse. Based on the repetition rate of
the voltage pulses, the measuring device calculates the shaft
speed.
MAINTENANCE
No maintenance is possible for this sensor. Moisten a clean,
lint-free cloth with water to clean the optical lens. Avoid
direct contact with the lens. Do not use alcohol for cleaning!
TRANSPORTATION AND STORAGE
• Put the sensor, cable and stand in the measuring device
case.
• Short-circuit the magnetic pole at the stand using the
washer.
Signal profile
Laser Trigger
RPM Sensor
VIB 6.631, VIB 6.631 EX
Installation and Operation
Printed in Germany LIT 66.200.EN.
092019
PARAMETER
VIB 6.631 / VIB 6.631 EX
Measur
ement
Measuring principle
Optical
Measuring range
3 to 120,000 rpm
Temperature range
-20 °C ... +50 °C
Electrical
Power supply
< 5.8 V (from measuring device)
Output
5 V (TTL)
Laser wavelength
630 - 680 nm (red)
Laser class
2 (DIN EN 60825-1, 2014)
Mechanical
Connection
Trigger cable VIB 5.432-2,9
Degree of protection
IP 65
Weight
76 g
Dimensions (L x D)
125 mm x 34 mm
EX
Marking
II 2 G Ex ib op is IIC T4
TECHNICAL DATA
Information regarding EX protection
Sensor VIB 6.631 EX is only provided for the “connection to
a corresponding measuring device / operating equipment
with separate EC type-examination certificate” or for the
“connection to certified intrinsically safe circuits taking into
account the maximum values”:
U
i
= 12 V DC
P
i
= 600 mW
I
i
= 160 mA
C
i
= 328 nF
L
i
= negligibly small
0 V
5 V
Light-increasing measuring mark:
Signal rises from 0 V to 5 V.
Light-decreasing measuring mark:
Signal drops from 5 V to 0 V.
0 V
5 V
The information in type-examination certificate Z elm 1 0
ATEX 0429 must be observed (www.pruftechnik.com). Fur-
thermore, the European Installation Regulations (EN 60079-
14) in the current version must be observed!
Fluke Deutschland GmbH
Freisinger Str. 34
85737 Ismaning, Germany
+ 49 89 99616-0
www.pruftechnik.com