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Model 451104 V2.0V 10/06 3
Operation
Meter Power
1. This meter is powered by one 9V battery. To replace or install the battery, refer to the
section ‘Battery Replacement’.
2. Press the ON-OFF button to turn the meter on. If the meter does not switch on, check
the battery.
3. When the meter switches on it runs through a 2-second self-test. When the self-test is
finished, the VEL display icon will appear in the upper left hand corner of the LCD. VEL
is the Air Velocity indicator. When it appears, the meter is ready for use.
Air Velocity Measurements
1. Turn the meter on and hold the measurement vane in the path of the air stream.
2. Read the Air Velocity and Temperature measurements on the LCD display. Air Velocity
readings are displayed in the center of the LCD while the Temperature reading is
shown on the bottom right of the LCD.
Data Hold
In cases where it is difficult to see the LCD display while taking a measurement, the meter
can freeze the measurement on the LCD for later viewing.
1. At any time during a measurement, press the HOLD button to freeze the reading. The
‘Hold’ display icon will switch on to alert the user that the meter is in the HOLD mode.
2. To exit this mode, press the HOLD button again (the ‘Hold’ display icon will switch off).
Selecting the units of measure
The meter can be used in either the feet per minute /
o
F mode or the meters per second
/
o
C mode. In the ft/m mode, the available air velocity units are ft/min (feet per minute),
mil/h (miles per hour) and knots (nautical miles per hour). Use the UNIT button to change
the unit of measure. In the m/s mode, the available air velocity units are m/s (meters per
second), km/h (kilometers per hour) and knots (nautical miles per hour). To change from
one mode to the other, follow these steps:
1. With the meter off, press and hold the SETUP button.
2. Press and release the ON button and at the second beep release the SETUP button.
3. The LCD will indicate Air Velocity units and temperature units.
4. Press the HOLD button to set the units to meters per second (m/s) and
o
C. Press the
SETUP button to set the units to feet per minute (ft/m) and
o
F).
5. Press the RECORD button and an ‘S’ will appear.
6. Press the HOLD button to save the setting.
7. ‘1200’ or ‘2400’ will appear on the LCD. This is the RS-232 PC Interface baud rate.
8. Press the HOLD button to set the baud rate to 1200 or the SETUP button to select a
2400 baud rate.
9. Press the RECORD button and an ‘S’ will appear.
10. Press the HOLD button to save the setting and return to the normal operating mode.