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57
The probe has to stand orthogonal with respect to the flow and it shall not to be inclined:
OK
NO
The probe is correctly positioned in the air stream when the measured value is the highest one.
Carry out measurements pursuant to the indications provided in the first paragraphs of this chap-
ter.
Probe Care and Maintenance
Probe performances, particularly at lowest speeds, depend on the friction with which the vane
turns around its own pivot. Low friction levels assure better performances. To guarantee this fea-
ture, it is suggested neither to force, lock or rotate the vane with fingers, nor to position it, as
much as possible, in airstreams containing elements that might cause the probe to get dirty.