Fluke VIB 6.631 Installation And Operations Download Page 1

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

= 12 V DC 

P

i

= 600 mW 

I

i

 

= 160 mA

C

i

= 328 nF 

L

= 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

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