DeltaOHM HD31, Operating Manual

Page: 35 / 154

HD31
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V1.6
The AP472 S… series probes are factory calibrated and don’t require user calibration.
ATTENTION: vane probes can be connected only to the C input of the instrument. If the
probe is connected to A or B inputs, the indication “Slot C” appears to indicate that the
probe should be moved to the C input .
To perform the measurement, extend the telescopic rod for the necessary length making sure
that the cable slides freely and without efforts. Insert the probe in the air flow to be measured,
keeping the propeller axis parallel to the flow, as indicated in the figures below. The probe
should be kept orthogonal to the flow and not inclined. The probe is correctly positioned in the
air flow when the maximum value is detected.
OK NO
Fig. 4.5.7: positioning vane probes