Extech Instruments 451104 User Manual
User's Guide
Digital Vane Thermo-Anemometer
Model 451104
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects
in parts and workmanship for one year from date of shipment (a six month limited
warranty applies on sensors and cables). If it should become necessary to return the
instrument for service during or beyond the warranty period, contact the Customer
Service Department at (781) 890-7440 ext. 210 for authorization or visit our website at
www.extech.com for contact information. A Return Authorization (RA) number must be
issued before any product is returned to Extech. The sender is responsible for shipping
charges, freight, insurance and proper packaging to prevent damage in transit. This
warranty does not apply to defects resulting from action of the user such as misuse,
improper wiring, operation outside of specification, improper maintenance or repair, or
unauthorized modification. Extech specifically disclaims any implied warranties or
merchantability or fitness for a specific purpose and will not be liable for any direct,
indirect, incidental or consequential damages. Extech's total liability is limited to repair or
replacement of the product. The warranty set forth above is inclusive and no other
warranty, whether written or oral, is expressed or implied.
Introduction
Congratulations on your purchase of the Extech 451104 Vane Thermo-Anemometer.
This device measures air velocity and temperature, displaying both simultaneously. The
measurement vane is built into the meter for ease of use.
This meter stores the highest (MAX), lowest (MIN), and average (AVG) readings for easy
recall. The built-in RS-232 PC Interface jack can be used to capture readings on a PC as
they are taken using the optional Model 407752 interface kit. This meter is shipped fully
tested and calibrated and, with proper use, will provide years of reliable service
Meter Description
1. Air velocity sensor with built-in Temperature
sensor
2. Data Hold button
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3. Min/Max/Avg Record button
4. Unit of measure button
5. ON-OFF power button
6. Set-up key (used for programming as described
in this manual)
7. LCD air velocity display
8. LCD temperature display
9. RS-232 PC port
Note that the battery compartment is located on the back of the meter
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Model 451104 V2.0V 10/06 2
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
o
The meter can be used in either the feet per minute /
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
SETUP button to set the units to feet per minute (ft/m) and
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.
F mode or the meters per second
o
o
F).
C. Press the
Model 451104 V2.0V 10/06 3
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