ALNOR TYPE 8125 "AirGard
VELOMETER JR.
®
The AirGard
Face Velocity Monitor is designed to indicate, by
correlation, the average velocity at the face of a ventilation hood. To
ensure that the average face velocity indicated by the AirGard
is correct, the AirGard
can be verified with a properly calibrated thermo-anemometer. Also, the
®
AirGard
monitor should be mounted at a location where local drafts are
very low and the curved probe will not interfere with the work area.
The calibration procedure follows four basic steps:
1. Make sure the AirGard
with the instrument are available—the curved probe and flexible
tube.
2. Zero the AirGard
3. Measure the average face velocity of the hood using a properly
calibrated thermo-anemometer.
4. Find the right location to mount the AirGard
along the face of the hood until the meter indicates the same value as
measured with the thermo-anemometer.
®
monitor should be mounted at a location where it
®
monitor attachments which were shipped
®
monitor.
Figure 2
3
®
ANEMOMETER
®
monitor by moving it
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"
®
monitor