F. CHANGING THE SETTINGS FOR IMPERIAL OR METRIC
The default setting for the measuring unit of air velocity is feet/min and the unit of temperature is
˚F. You can change the measuring units to meter/sec and ˚C by following these steps:
1. Press ON and AVERAGE at the same time.
2. Release ON first then AVERAGE. The LCD will show “ft/min” (default) on the upper right
corner and “˚F” on the lower right corner in small print.
a) Press HOLD key to change the measuring units to metric system;
press AVERAGE key for imperial measuring units
b) Press the MIN/MAX REC key and an “S” will show on the LCD. Press HOLD to confirm
and save the changed value. At this time, the baud rate “2400” (default) appears on
the screen to be followed by section G, step 1 for changing RS-232 output (if neces-
sary)
G. SETTING THE RS-232 OUTPUT (OPTIONAL ACCESSORY)
By following the steps under section E you will see a “2400” number on the screen. This is the
default setting of the baud rate for the RS232 output. You can change the setting to “1200” by fol-
lowing these steps:
1. After following steps 1 & 2 in section E press the HOLD key. The setting can be changed
back to “2400” by pressing the AVERAGE key
2. Please remember to save your changes by pressing the MIN/MAX REC key. An “S” is dis-
played on the screen. Press the HOLD key to confirm and save the changed value. The
meter will return to air velocity mode automatically
H. AUTO POWER OFF
The unit will turn off automatically after 20 minutes to save the battery. This will be preceded by 3
beeps. Press the ON key and the unit will resume operation.
I. MEASURING FEET/MIN, MPH, KNOTS, M/S, KM/H
1. IN IMPERIAL: Press the SEL: MPH/H•KNOT key and the reading will change from ft/min to
mil/h to knots in turn.
2. IN METRIC: Press the SEL: MPH/H•KNOT key and the reading will change from m/s to km/h
to knots in turn.
J. DIRECT MEASURING OF AIR FLOW (SINGLE POINT) CFM
Air velocity measurement is calculated by multiplying the air velocity readings by the free area
dimensions. Free area is usually published by the grill or register manufacturer you are servicing.
You must determine the free area of the air source before entering it into the meter.
1. Power unit on
2. Press MODE once (you will hear one beep). Meter will display “AREA” in upper case letter-
ing and “1.111” will appear.The first digit will be flashing.
3. Press the HOLD key to increase the number.
4. Press the AVERAGE key to advance to next number. Follow Step 3 and repeat.
5 Press the MODE key once all digits have been entered. The word “flow” will appear.
K. CALCULATING FREE AREA
If the free area is not published by the grille manufacturer use one of the following formulas to
determine the correct value:
1) For square or rectangular grills: Length x Width ÷ 144
2) For round grills: Radius
2
x π (3.1415) ÷ 144
3
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