Model 451181 Version 3.0 07/06
5
Measurement Procedure
Air Velocity, Temperature, Relative Humidity, and Wet Bulb Measurements
1.
Turn the instrument ON by pressing the ON/OFF button.
2.
Turn the temperature/humidity
sensor cover (located at the
center of the vane) to the
OPEN position. This will
expose the sensors to the air
flow in order to provide
temperature, humidity, and wet
bulb readings (see diagram).
3. Press
F1
MEAS
to enter the
measurement mode.
4.
Hold the vane sensor in the
stream of air with the vane’s
temperature and humidity
sensors facing the oncoming
air stream.
5.
Read the Air Velocity, Temperature, Relative Humidity, Wet Bulb Temperature, and
Air Volume readings on the LCD (see
diagram).
6. Use
F1
EXIT
to leave the measurement
window.
7. Use
F2
INPUT
to begin programming
the area of the duct, or other enclosure,
necessary for Air Volume (CFM / CMM)
measurements. Refer to the separate
section on Air Volume measurements.
8. Use
F4
PRN
to print the measurement
data (see next paragraph).
9.
Move the rotating sensor cover to the closed position when the meter is not in use.
See diagram above.
Printing Measurements
1.
Perform the Measurement procedure as described above.
2. Press
F4
PRN
and answer YES when prompted.
3.
The instrument will print all the displayed data with
date/time stamps. See sample printout at right.
4.
Press the LINE FEED button to feed the paper.
SAMPLE PRINTOUT
T:
RH:
WBT:
VOL:
75.7oF
58.4%
V:
FPM
66.1oF
0.0CFM
98.0
EXIT
PRN
INPUT
MEASUREMENT (MEAS) SCREEN
ACME CORP.
V:
600 MPH
T:
75.2 F
RH: 46.5%
WBT:61.3 F
VOL:174 CFM
06-17 01:49:07
O
P
E
N
CLO
S
E
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