Use; Contact-Free Measurements; Measurements With Contact - Chauvin Arnoux C.A 1725 Notice D'utilisation

3.1 CONTACT-FREE MEASUREMENTS

The contact-free measurement is made by the optical sensor built into the device. This sensor, placed
in the front of the device, comprises a frequency-modulated infrared transmitter.
Before making any measurement, it is necessary to prepare the revolving target of which the speed is
to be determined.
Check that the surface sighted is free of spurious reflections that might be counted in addition to the
pulses from the reflecting adhesive. Proceed as follows: before applying the adhesive used to make
the measurement, turn the target and check that when it is sighted the reading remains at ---. If not, it
will be necessary to cover the entire surface of the target with a mat black medium.
When the target is correct, apply a reflecting adhesive tape on it, along the longest available radius. On
small targets, the area covered by the adhesive tape must be less than 50% of the total area of the
rotating part.
Start the target turning, aim the front of the device at it, and check that the measurement OK symbol
flashes regularly.
The distance between the sensor and the target must be between 1 and 50cm.
The measurement angle of 30° (15° on either side of the perpendicular to the target) is convenient for
aiming purposes.
During measurements of low speeds, very small movements of the device may make the measurement
unstable: if this happens, we recommend placing the device on a stable support. There is a nut on the
underside of the device for attachment to a tripod or similar support.

3.2 MEASUREMENTS WITH CONTACT

The mechanical adapter and its 3 end fittings allow measurement by contact on a shaft end or on a
surface in linear motion.
It is placed in front of the sighting window of the optical sensor and accepts one of the following 3 end
fittings:
- An elastomer cone with a tip that can be used for shaft end measurements
(minimum diameter: 5mm).
- An elastomer cylinder that can be used for measurements on shafts with flat ends or shafts
smaller than 5mm.
- An elastomer wheel for linear speed measurements (1 revolution of the wheel = 0.1m).
The end fitting must be pressed against the moving part just hard enough to drive it without slippage.
The adapter is attached to the front of the tachometer housing, in front of the sighting window. It
automatically locks in position when pushed home.
- Fitting
To attach the adapter, align the three lugs on the inside of the adapter with the three recesses of the
sighting window of the housing and turn anticlockwise.
- Removal
To remove it, pull the adapter outward until the locking tabs are clear, then turn clockwise.

3. USE

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