Dwyer 8904 - Manual (Page 12)

AREA
2 ft
Fig.14
I. MEASURING ft/m , MPH, Knot (Km/
Hour) (model 8904,8906 only)
In imperial , press SEL :.MPH . KNOT
Key, the reading will change from ft/m,
mil/h, knot in turns. In metric, press
SEL
:.MPH. KNOT key, the reading will change
from m/s , km/h, knot in turn .
Air Velocity measurement is calculated
by multiplying the air velocity readings
by the free area dimensions. Free area
is published by the grill and register
manufacturer you are servicing. You must
first determine the free area of the air
source before entering it into the meter.
1. Power unit on
2. Press MODE once. LCD will display
"AREA" and "1.111" will appear
(See Fig.14). The first digit will flash.
3. Press the HOLD key to increase the
number.
4. Press the AVERAGE key to advance
to next number. Follow Step 3 and
repeat to input the free area size.
5. Press the MODE key once all digits
have been entered. The word "flow"
will appear.
J. DIRECT MEASURING OF AIR
FLOW (SINGLE POINT) CFM
(model 8906 only)
The unit will turn off automatically after
20 minutes to save the battery. This will
be preceded by 3 beeps.
11
H. AUTO POWER OFF