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 o
C or o
F units. The meter can also display air flow in CFM or CMM. The built-in datalogger can record up to 2000 readings and the RS-232 interface provides PC data transfer capability.
Specifications
General Specifications
Display
Data hold
Sensor Structure
Dual 4-digit (9999 count) Multi-function LCD
Locks latest reading on the LCD display
Air velocity sensor: Conventional twisted vane arm with low friction
(sapphire) ball bearing. Temperature sensor: K-type thermocouple built into vane. 1/4" mounting nut provided
Records Max/Min readings with push-key RECALL
RS-232 PC serial interface
Memory Recall
Data Output
Operating conditions
(Meter)
Operating conditions
(Vane)
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
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
Accessories
Meter: 3.46 x 6.61 x 1.03" (88 x 168 x 26.2mm);
Vane: 2.6 x 5.22 x 1.15" (66 x 132 x 29.2mm)
9V battery and carrying case
Range Specifications
Measurement
Feet per Minute (ft/min)
Meters per Second (m/s)
Kilometers per Hour (km/hr)
Miles per Hour (mile/hr)
Knots
Air Velocity
Calibrated Range
60.0 to 8800
0.30 to 45.00
1.00 to 140.0
0.70 to 100.0
0.60 - 88.0
Display
Resolution
0.1
0.01
0.01
0.01
0.01
Accuracy
± (3% + 20 ft/min)
± (3% + 0.1 m/s)
± (3% + 0.4 km/hr)
± (3% + 0.2 mile/hr)
± (3% + 0.2 knots)
Units Range
Temperature
Converter Resolution Accuracy o
C 0.0
o
C to 45.0
o
C 0.2
o
C ±1.0
o
C o
F 32.0
o
F to 113.0
o
F 0.4
o
F ±1.8
o
F
CFM (ft
3
/min)
Air Flow and Area
(CMM: 0 to 45.00 m/s; CFM: 0 to 8800 ft/min)
Range Resolution
0 to 999900 0.001 to 100
Area
0.001 to 9999
CMM (m
3
/min) 0 to 999900 0.001 to 100 0.001 to 9999
Meter Description
LCD Display Icon Definitions
AVE
MIN
Average reading mode is selected o
C
Minimum reading mode is selected o
F
2/3V
MAX
VEL
2/3V Maximum mode is selected
CFM
CMM Maximum reading mode is selected
Air Velocity measurement x100
X10 READ Recalling stored measurements
REC Appears when recording readings
RS-232 PC Interface is activated ft
2 m
2 m/s ft/min
Temperature is displayed in degrees centigrade
Temperature is displayed in degrees
Fahrenheit
Cubic feet per minute (ft
3
/min)
Cubic meters per minute (m
3
/min)
Multiply reading by one hundred
Multiply reading by ten
Meters per second
Feet per minute
Operation
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 a 20 o
axis of air direction with the rear of the vane (refer to Fig.2).
Air Velocity
Side view of Vane
1. Power the meter by pressing .
20 o
2. Select Air Velocity measurement function by pressing . VEL will appear on the LCD.
20 o
Air direction
3. Press to select the desired unit of measure (ft/min, mph, km/h, m/s or knots)
Tripod mount
4. Place the vane in the air flow with the air direction matching the direction of
Figure 2 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 .
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)
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.
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.
Software
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: 486 PC or better with COM 1 and COM 2 Serial ports
Operating System Compatibility: Windows
TM
95/98/NT/2000/XP
Hardware Connection
The IR Thermometer connects to a PC with the supplied DB-9 to DB-9 interface cable.
Software Installation
The instructions on how to install the optional software are printed on the Software CD label. After reading the label’s directions, load the software CD in the PC CD-ROM drive.
Starting the Software
1. Run the program by opening the program named “Flow
Anemometer”.
Flow Anemometer is in the programs folder of your
Windows software.
2. Wait for the program to initialize and select COM 1 or 2 as required.
The program will load and the main display will appear.
A red NO COM icon will flash on the bottom right hand side of the display.
3. Press and hold then power on the meter by pressing
The RS232 icon will appear on the upper right hand side display of the meter.
The NO COM icon will disappear.
Communications has been established.
Values will appear in the diplay.
Operating the Software
Graphical Display Mode
The display command offers 5 different displays.
Click Display on menu bar to select.
Click Option to set Upper and Lower Limits. The software will then flag readings exceeding the limits.
Main Display
Click Reset button on main
display to clear Min/Max
Digital Display
Analog Display Graphical Display
Click Scale in Graphical Mode
to change x and y axis scale.
List Display
Data Acquisition Mode
In data acquisition mode the meter is connected to a PC with the data being saved directly to the PC’s memory.
1. In the Flow Anemometer program, click File, and then click Name. Enter a file name and click OK enter a sampling interval and then click OK
Recording.
4. To stop the meter click File then click End Recording.
Viewing Files
Files can be view in table form or they can be plotted on a graph.
Viewing in a table:
5. In the Flow Anemometer program, click File, and then click View File.
6. When the View screen opens click File then click Open. you want to open.
8. In the folder list, locate and open the folder that contains the file. The File will then open. Click File then Print to print records
Plotting a graph
1. In the Flow Anemometer program, click File, and then click Plot Data from File.
2. When the Plot Data screen opens click File then click Open. you want to open.
4. In the folder list, locate and open the folder that contains the file. The File will then open. Click Print to print the graph. The graph can also be modified and manipulated by using the graphing commands.
Downloading Logged Data to the PC
Note: The RS232 communication symbol should NOT be displayed in the LCD when downloading.
The Datalogger Anemometer screen will open.
Log File screen will open.
Enter a File name and click OK button.
The Status screen will open.
Status screen will count up the number of readings being transferred.
3. Press to initiate data transfer from the meter to the PC
4. When transfer is completed click OK.
5. The datalogger screen will appear and display the number of records and the sampling rate they were taken at. viewed
Useful Equations and Conversions
Area equations
Rectangular Duct
H
Area = W x H
Circular Duct
A=
π
R
2
(A= 3.14 x R x R)
W
Cubic equations
CFM (ft
3
/min) = Air Velocity (ft/min) x Area (ft
2
)
CMM (m
3
/min) = Air Velocity (m/sec) x Area (m
2
) x 60
Units Conversion Table
1 m/s
1 ft/min
1 knot
1 km/hr
1 mph
1
0.00508
0.5144
0.2778
0.4464
196.87
1
101.27
54.69
87.89
1.944
0.00987
1
0.54
0.8679
3.6 2.24
0.01829 0.01138
1.8519 1.1523
1
1.6071
0.6222
1
R
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
Appendix A: Real-time Datalog-to-PC transfer
Byte 1 0D (Hex)
Byte 2 bit4: Velocity OL, bit5 Area OL, bit 6:
Temp OL
Byte 9
Byte 10
Digit 2 in upper LCD
Digit 1 in upper LCD
Byte 3 0: m/s, 1: ft/min, 2: knots, 3: km/hr, 4: MPH Byte 11 Digit 0 (LSB) in upper
LCD
Byte 12 Digit 3 (MSB) in lower
LCD
Byte 4 bit2: MAX, bit3: MIN, bit4: 0:VEL 1:FLOW, bit 5: 0: DEG C, 1:DEG F, bit7: RS-232 enabled
Byte 5 bit0: 0:CMM, 1: CFM, bit3: low batt, bit4:
Temp OL, bit5: AVE, bit6: 2/3Vmax, bit7: Instant
Byte 6 Lower LCD decimal, bit0: x100, bit1: x10, bit2: x1, bit3: dp1 (rightmost), bit4: dp2, bit5: dp3
(leftmost)
Byte 13
Byte 14
Digit 2 in lower LCD
Digit 1 in lower LCD
Byte 7 Upper LCD decimal, bit2: x1, bit3: dp1
(rightmost), bit4: dp2, bit5: dp3 (leftmost)
Byte 8 Digit 3 (MSD) in upper LCD
Appendix B: Transferring Logged Data to the PC
Byte 15 Digit 0 (LSB) in lower
LCD
Byte 0 0D (hex) Byte 772 Digit 3 (MSB) in lower LCD
Byte 1
Byte 2
Calibration Data 0
Calibration Data 1
Byte 773
Byte 774
Digit 0 (LSB) in upper LCD
Digit 1 in upper LCD
Byte 3
Byte 4
Byte 5
Byte 6
Calibration Data 2
Sampling time
Last record no. (low byte)
Last record no. (high byte)
Byte 775
Byte 776
Byte 777
Byte 778
Digit 2 in upper LCD
Digit 3 (MSB) in upper LCD
Upper LCD decimal, bit2: x1, bit3: dp1 (rightmost), bit4: dp2, bit5: dp3 (leftmost)
Lower LCD decimal, bit0: x100, bit1: x10, bit2: x1, bit3: dp1 (rightmost), bit4: dp2, bit5: dp3 (leftmost)
Byte 7
Byte 8
Byte 9 Decimal pt. for area
(refer to byte 778)
Byte 10 - 768 Reserved
Byte 769
Free area (low byte) Byte 779
Free area (high byte)
Byte 780
Byte 781
Byte 782 bit0: 0:CMM, 1: CFM, bit3: low batt, bit4: Temp OL, bit5:
AVE, bit6: 2/3Vmax, bit7:
Instant bit2: MAX, bit3: MIN, bit4:
0:VEL 1:FLOW, bit 5: 0: DEG C, 1:DEG F, bit7: RS-232 enabled
0: m/s, 1: ft/min, 2: knots, 3: km/hr, 4: MPH bit4: Velocity OL, bit5 Area
OL, bit 6: Temp OL
Not used
Byte 770
Byte 771
Digit 0 (LSB) in lower LCD
Byte 783
Digit 1 in lower LCD Byte 784
Digit 2 in lower LCD Byte 785 -
32768
Not used
Record No. 2 to Record No.
2000
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 (click on ‘Contact Extech’ and go to ‘Service Department’ to request an
RA number). 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.
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 Service Department for information on calibration services available for this product. Extech recommends that annual calibrations be performed to verify meter performance and accuracy.
Support Hotline (781) 890-7440
Tech support: Ext. 200; Email: [email protected]
Repair/Returns: Ext. 210; Email: [email protected]
Website: www.extech.com
Copyright © 2004 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.
