User's Guide
Vane Thermo-Anemometer Datalogger
Model 451126
Introduction
Congratulations on your purchase of Extech's Thermo-Anemometer Datalogger. This
Vane-type Anemometer can indicate Air Velocity in five units of measure: Feet per minute,
Meters per second, Miles per hour, Kilometers per hour, and Knots with Temperature
displayed in
datalogger can record up to 2000 readings and the RS-232 interface provides PC data
transfer capability.
o
C or oF units. The meter can also display air flow in CFM or CMM. The built-in
Specifications
Display Dual 4-digit (9999 count) Multi-function LCD
Data hold Locks latest reading on the LCD display
Sensor Structure Air velocity sensor: Conventional twisted vane arm with low friction
Memory Recall Records Max/Min readings with push-key RECALL
Data Output RS-232 PC serial interface
Operating conditions
(Meter)
Operating conditions
(Vane)
Storage temperature Temperature: -40°F to 140°F (-40°C to 60°C)
Power Supply 9V battery; Battery life: 50 hours typical
Power Consumption Approx. 3 mA DC
Weight 0.77 lbs. (350g)
Dimensions Meter: 3.46 x 6.61 x 1.03" (88 x 168 x 26.2mm);
Accessories 9V battery and carrying case
Range Specifications
Measurement
Feet per Minute (ft/min) 60.0 to 8800 0.1 ± (3% + 20 ft/min)
Meters per Second (m/s) 0.30 to 45.00 0.01 ± (3% + 0.1 m/s)
Kilometers per Hour (km/hr) 1.00 to 140.0 0.01 ± (3% + 0.4 km/hr)
Miles per Hour (mile/hr) 0.70 to 100.0 0.01 ± (3% + 0.2 mile/hr)
Knots 0.60 - 88.0 0.01 ± (3% + 0.2 knots)
Units Range Converter Resolution Accuracy
o
C 0.0oC to 45.0oC 0.2oC ±1.0oC
o
F 32.0oF to 113.0oF 0.4oF ±1.8oF
Range Resolution Area
CFM (ft3/min) 0 to 999900 0.001 to 100 0.001 to 9999
CMM (m3/min) 0 to 999900 0.001 to 100 0.001 to 9999
(sapphire) ball bearing. Temperature sensor: K-type thermocouple
built into vane. 1/4" mounting nut provided
Temperature: 32°F to 122°F (0°C to 50°C); Humidity: <80% RH;
Pressure: 500mB to 2 Bar
Temperature: 32°F to 140°F (0°C to 60°C); Humidity: <80% RH;
Pressure: 500mB to 2 Bar
Vane: 2.6 x 5.22 x 1.15" (66 x 132 x 29.2mm)
Air Velocity
Calibrated Range
Display
Resolution
Temperature
Air Flow and Area
(CMM: 0 to 45.00 m/s; CFM: 0 to 8800 ft/min)
Accuracy
(%FS)
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Model 451126 V2.0 6/08
Meter Description
1. LCD Display
2. Vane Sensor
3. ON/OFF Key
4. RS-232 Connector
5. Function/Numeric Keypad
LCD Display Icon Definitions
o
AVE Average reading mode
is selected
MIN Minimum reading mode
is selected
2/3V 2/3V Maximum mode is
selected
MAX Maximum reading
mode is selected
VEL Air Velocity
measurement
READ Recalling stored
measurements
REC Appears when
recording readings
RS-232 PC Interface is
activated
ft2 Square feet MPH Miles per hour
m2 Square meters Km/h Kilometers per hour
C Temperature is displayed in degrees
o
F Temperature is displayed in degrees
CFM Cubic feet per minute (ft3/min)
CMM Cubic meters per minute (m3/min)
x100 Multiply reading by one hundred
X10 Multiply reading by ten
m/s Meters per second
ft/min Feet per minute
centigrade
Fahrenheit
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Model 451126 V2.0 6/08
Operation
n
NOTE: For all air velocity or flow measurements, the air should pass through the vane
from back to front. The rear of the vane can be found by locating the mounting nut. The
front of the vane has the engraving "ANEMOMETER". For more accurate results, maintain
o
axis of air direction with the rear of the vane (refer to Fig.2).
a 20
Air Velocity
1. Power the meter by pressing .
2. Select Air Velocity measurement
function by pressing . VEL will
appear on the LCD.
3. Press to select the desired unit
of measure (ft/min, mph, km/h, m/s or
knots)
4. Place the vane in the air flow with the
air direction matching the direction of
the arrows printed on the inner walls
of the vane. If the unit does not have the printed arrows, have the tripod mount side
of the vane facing the air flow (see Fig.2).
5. Air velocity will be displayed on the bottom line of the LCD.
Temperature
1. When the meter is measuring Air Velocity, Temperature is simultaneously being
measured by the vane's built-in type-K thermocouple.
2. Press to select °C or °F. Temperature is displayed on the upper line of the
LCD.
Air Flow
1. Power the meter by pressing .
Side view
of Vane
Tripod mount
Figure 2
o
20
Air directio
o
20
2. Press to select airflow. FLOW will display.
3. Press to select the desired unit of measure. (CFM, CMM).
4. To enter the area value, press . The lower display line will blank waiting for
the user to program new data. Use the numeric keys to enter a new area value in
square feet. (REMINDER: if measurement is taken in inches, divide by 144 to
obtain square feet). Press when finished.
Airflow is based on the specific dimensions of the duct being measured. For the
meter to correctly measure CFM the user must input the area of the duct. Failing to
input the correct area dimensions will result in erroneous readings.
NOTE: If the AVE or the 2/3MAX display icons are displayed in the upper left hand
corner of the LCD, press until they extinguish.
5. Place the vane in the air flow (Fig.2).
6. Wait approximately 2 seconds for a stabilized Air Flow reading.
7. The equation below is used to calculate Air Flow:
AIR FLOW = (AIR VELOCITY) x (AREA)
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Model 451126 V2.0 6/08
2/3Vmax Air Flow
1. Power the meter by pressing .
2. Press to select Air Flow. FLOW will display.
3. Press to select the desired units (CFM, CMM).
4. The previously stored area value will be displayed on the upper LCD display line.
To enter a new area value press . The lower display line will blank waiting for
the user to program new data. Use the numeric keys to enter a new area value in
square feet. Press when finished.
5. Press until the 2/3V MAX icon appears on the LCD.
6. Determine the direction of the air to be measured. Move the Vane around the
center of the area being measured to read the maximum air velocity. The meter will
use the maximum reading obtained to determine the 2/3MAX Air Flow.
Average Air Flow
1. Power the meter by pressing .
2. Press to select Air Flow. FLOW will display.
3. Press to select the desired units (CFM, CMM).
4. The previously stored area value will be displayed on the upper LCD display line.
To enter a new area value press . The lower display line will blank waiting for
the user to program new data. Use the numeric keys to enter a new area value.
Press when finished.
5. Press until AVE appears on the LCD display.
6. Press to clear the upper LCD.
7. Select a measurement location. Once a point is selected and a flow measurement
is displayed, press to average the flow reading.
8. Select the next measurement location and press again to average the
reading with previous readings. The value in the upper LCD line will increment for
each reading taken to show how many readings were averaged. The max is 12
readings.
Data Hold
Press to freeze the reading. The display will hold and an 'H' will appear on the LCD.
Press again to return to normal operation.
MAX and MIN Measurements
1. Press to enter MAX mode. The meter will only display the highest reading.
2. Press again to enter the MIN. The meter will only display the lowest reading.
3. Press to exit the MAX or the MIN mode.
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Model 451126 V2.0 6/08
Datalogging
Instantaneous (One-Shot) Datalogging
To record one data point at any desired time, set the sampling rate = 0 by pressing
in the VEL mode. The previously stored reading will be displayed on the upper LCD line.
Enter a '0' sampling time and then press . Now, each time is pressed, the
present reading will be stored in non-volatile memory.
Automatic Datalogging
1. Set the Sampling rate for datalogging by pressing . The previous sample
rate will appear.
2. Enter a value from 1 to 240 seconds using the numeric keypad. Press when
done.
3. Press to begin storing readings in non-volatile memory every n seconds (n =
the value entered in step 2. above).
4. The REC icon will appear on the LCD indicating that the datalogging mode is
activated.
5. The maximum number of readings that can be stored is 2000.
6. To stop datalogging, press again. The datalogger will automatically stop
recording data when 2000 records have been stored.
See software section of this manual for instruction on viewing logged data.
IMPORTANT NOTE: If power is removed before datalogging is properly halted,
data will be lost.
Reading Stored Data Sequentially
Press , the RECORD NUMBER will briefly display on the upper LCD line before
the measurement data appears. Press to return to normal operation.
Reading Stored Data Randomly
1. Press to enter the READ mode.
2. Press and enter the number of the record in question.
3. Press again and the desired data will be displayed.
4. Press to return to normal operation.
Clearing Datalog Memory
Press and hold while powering up the meter to clear the meter's datalog
memory.
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Model 451126 V2.0 6/08
Software Requirements and Installation
The 451126 software lets the user:
• Download logged recordings from the meter’s memory
• Record to the PC
• Graphically display readings from the meter
System Requirements
Hardware Requirements: PC recommended with processor of Pentium III 600MHz or
above.
RAM: Recommended 512MB of RAM or more
Screen Resolution: requires 1,024 x 768 pixels.
451126 Anemometer
TM
Operating System Compatibility: Windows
Hardware Connection
The meter connects to a PC with the supplied DB-9 to DB-9 interface cable. The meter
can also be used with a Serial to USB Adaptor. NOTE: The driver that comes with the
adaptor should be installed in order to connect via USB. Please follow the instructions
that came with your adaptor.
Software Installation
Load the software CD in the PC CD-ROM drive. Close any open programs. Click on
SETUP and the following windows will appear directing the user through the install:
95/98/NT/2000/XP/VISTA
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Model 451126 V2.0 6/08
1. 4.
Click “Next”
2. 5.
Click “Next”
3. 6.
Click “I accept” Reboot PC
NOTES: The meter is supplied with a 9 pin DB9 RS232 cable. In order to establish
communication with the meter the correct COM PORT must be selected in the 451126
Software. To find out what COM PORTS are available go to Windows Device
Manager>Ports. It is here the COM PORTS will be listed.
If using the meter with a Serial to USB Adaptor make sure you install the driver that is
supplied with the 3
Manager>Ports and make sure that the brand name of the Serial to USB Adaptor is
listed here. Note what COM PORT it has assigned. Make sure that in the 451126
Software you select the COM PORT it is assigned to in order to establish
communication.
rd
party adaptor. Once this is done ,check under Windows Device
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Model 451126 V2.0 6/08
Useful Equations and Conversions
Area equations
Rec tang u la r Du c t
Area = W x H
H
W
Circu la r Du c t
(A= 3.14 x R x R)
A=
2
R
π
Cubic equations
3
CFM (ft
CMM (m
/min) = Air Velocity (ft/min) x Area (ft2)
3
/min) = Air Velocity (m/sec) x Area (m2) x 60
Units Conversion Table
m/s ft/min knots km/hr mph
1 m/s 1 196.87 1.944 3.6 2.24
1 ft/min 0.00508 1 0.00987 0.01829 0.01138
1 knot 0.5144 101.27 1 1.8519 1.1523
1 km/hr 0.2778 54.69 0.54 1 0.6222
1 mph 0.4464 87.89 0.8679 1.6071 1
R
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Model 451126 V2.0 6/08
Battery Replacement
The low battery indicator appears on the LCD display when it is time to replace the 9V
battery, which powers the meter.
To replace the battery:
a. Turn the meter off.
b. Remove the battery compartment screw and remove the battery compartment
cover.
c. Replace the 9V battery and reinstall the compartment cover.
d. Fasten the compartment screw
Warranty
EXTECH INSTRUMENTS CORPORATION (A FLIR COMPANY) 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 to 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 www.extech.com
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.
for contact information. A Return Authorization (RA) number
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also
provides NIST certification for most products. Call the Customer Care Department for
information on calibration services available for this product. Extech recommends that
annual calibrations be performed to verify meter performance and accuracy.
Copyright © 2008 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any form.
Technical Support: Extension 200; E-mail: support@extech.com
Repair & Returns: Extension 210; E-mail: repair@extech.com
Product specifications subject to change without notice
For the latest version of this User Guide, Software updates, and other
---
Support line (781) 890-7440
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Model 451126 V2.0 6/08
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