Battery
Corrosion: Examine battery at least every two
months for signs of corrosion. To access
battery, follow instructions in OPERATION
section. Remove battery if there are any signs
of corrosion or moisture. Clean the battery
connectors and any other affected parts with a
clean cloth moistened with water only. Allow
parts to dry thoroughly, and install fresh
battery. If instrument is not to be used for
more than two months, remove battery and
store in separate container.
Replacement: Refer to Paragraph 3 of the
OPERATION section to determine whether
battery replacement is needed.
Zero Adjustment
1. Mechanically
Turn instrument to OFF position and using
a screw driver turn screw in front of
instrument so the meter needle is lined up
with the zero picket.
2. Electrically
Turn instrument to the LO position. Cover
probe sensor window to prevent any air
flow and turn the ZERO adjustment screw
on the left hand side of the instrument until
meter needle lines up with the zero picket.
Low Span Adjustment
Set instrument in the wind tunnel with the
probe positioned so that the air flow is in the
direction of the arrow on the probe. Set
instrument to the LO position. Set the wind
tunnel to 300 FPM (1.5 m/s) and turn the
LSPAN adjustment screw on the left hand
side of the instrument until the meter needle
lines up with the full-scale mark.
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