Series PC Manual V 1.0 - Rev. 3 – 03/01/01 DS Europe
10
Figure 4A
Whenever the distance is shorter than 4mm (in any case remaining constant) there would
be a constant measure error that would be easily recovered by recalibrating the transducer
mod. PCR (either by means of the push buttons or the RS485 with an external computer).
When Mod. PCR is used together with AFR-1E floating cursor, It is calibrated in order to
have a measuring stroke in the middle of two death zones A= 30mm and B= 25mm (Figure
4A ).
The mod. AFR-1E can pass over these two “A” and “B” death zones without causing any
damage but It will not generate any signal (analog outputs will be positively or negatively
saturated while the RS485 will give a “9999999” output).
For performance optimisation, the Customer must supply DS Europe with all the
installation conditions
5.4. MAGNETS CHOSEN BY THE USER
It must have a high magnetic field, invariable throughout time and with a high maximum
working temperature. The lobe of the magnetic flow must be wide enough to interest the
magnetostrictive waveguide. Polarity must be as indicated in Fig. 4.
Mark the North Pole with a coloured dot.
You are advised to use permanent rare earth magnets for temperatures up to 120°C, with
diameters of 5÷8 mm and lengths of 10÷20 mm.
The magnetic field is considered to be sufficient when the measurement, controlled in the
factory, occurs near the dead length “A” of the probe end and at all the points along the
measuring stroke.
The magnets must be sent to the factory for performance optimisation, indicating all the
methods of use.
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