Dwyer VT-200 User Manual

Model VT-200 Vane Thermo-Anemometer

6.400

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3.206
[81.4]

2.375
[121]

5.00

[127]

Specifications– Installation and Operating Instructions

DESCRIPTION

Model VT-200 Vane Thermo-Anemometer is ideal for

balancing air conditioning and heating ducts or checking the
operation of fans and blowers. Model VT-200 measures air
volume in cubic feet per minute and cubic meters per minute.
Air velocity measurements can be viewed in ft/min, m/s, knots,
km/hr, and mph with ±3% accuracy. The multifunction LCD
can simultaneously display air velocity and temperature in
selectable units or air flow and air area. Built-in datalogger can
store up to 1000 measurements or transfer the data to a PC via
RS-232 communication. Additional features include data hold
and record/recall minimum, maximum and average readings.
Model VT-200 includes RS-232 interface, PC Windows soft­ware, cable, 9V battery, carrying case, and instruction manual.

DISPLAY DESCRIPTIONS

AVE: When selected from the OPTION menu, this indicates
MAX: This symbol will appear when MIN/MAX button is

MIN: When MIN/MAX button is pressed twice, this symbol

2/3V: When selected by the OPTION button, this will be
VEL: When VEL/FLOW button is pressed once, this symbol
FLOW: When VEL/FLOW button is pressed twice, this symbol
READ: This symbol will appear when READ function is
REC: When unit is recording data, this symbol will appear.

RS-232: When the RS-232 function is enabled, this symbol will

2

ft

: This will appear in the FLOW function indicating the unit

2

: This will appear in the FLOW function indicating the unit

m
CFM: This symbol indicates units measured in cubic feet per
CMM: This symbol indicates units measured in cubic meters
m/s: This symbol indicates units are measured in meters per
ft/min: This indicates units are measured in feet per minute.

Km/h: This units are measured in kilometers per hour.
x100: This indicates the actual value is multiplied by 100.
x10: This indicates the actual value is multiplied by 10.

method of average.
pressed once. This will indicate maximum value of

measured air velocity or air flow.

will appear . It indicates the minimum value of measured

air velocity or air flow.
displayed with MAX symbol.
will appear indicating unit is measuring air velocity.
will appear indicating the unit is measuring air flow.
enabled. This allows user to read recorded data.

appear.
is measuring in square feet.
is measuring in square meters.
minute.
per minute.

second.

BULLETIN AV-VT200

PHYSICAL DATA
Air Velocity Ranges: 80 to

4925 ft/m, 1.4 to 90.0 kph, 0.9
to 55.9 mph, 0.4 to 25.0 m/s,

1.9 to 38.8 knots.
Temperature Range: 32 to

140°F (0 to 60°C).
Resolution: 10 ft/m, 0.1 kph,

0.1 mph, 0.1 m/s, 0.1 knots,

0.1°F, 0.1°C.
Accuracy: Air Velocity: ±2% +
1 digit, Temperature: 1.5°F

HOW TO MEASURE WIND/ AIR VELOCITY

1. Press the ON/OFF button to turn on the anemometer.

2. To select anemometer function, press the VEL/FLOW button
(Number 4).

3. Choose which option is needed, either VEL (Air Velocity) or

FLOW (air flow) The VEL or the FLOW symbol will appear in
the upper left corner of the LCD.

4. Press the UNIT button (Number 3) to select desired unit of

measurement. The selected unit of measure will be displayed
at the top of the LCD.

5. Determine the approximate wind direction.

6. Hold the anemometer vane so that the air flow will pass

through from the back to the front. (NOTE: The back of the

vane has a place for a mounting screw and the front has

“ANEMOMETER” engraved on the handle.) Make sure the air

is flowing in the direction of the arrows on the inside of the
vane. .

7. Wait for two seconds in order to obtain a stabilized reading.

HOW TO MEASURE WIND/AIR TEMPERATURE

(NOTE: Temperature and wind velocity are measured simultane-
ously.)

1. Select either °C or °F by pressing °C/°F button (Number 6).

2. Let wind pass through center of vane. (A thermocouple is built

into the center of the vane.)

3. Obtain temperature reading on LCD.

HOW TO MEASURE WIND/AIR FLOW

1. Press the ON/OFF button to turn on anemometer.

2. Press the VEL/FLOW button (Number 4) to select FLOW func-

tion. The FLOW symbol will appear in the upper left corner of
the LCD.

3. Press the UNIT button (Number 3) to select desired unit of

measurement. (CFM or CMM)

(0.8°C).

Temp. Sensor: Thermistor.
Operating Temperature: 32 to

122°F (0 to 50°C) max 80%
RH.
Output: RS232 serial interface
via 3.5 mm terminal.
Power Supply: One 9 V
battery.
Power Current: Approx. 8.3
mA.

Housing: ABS plastic.
Weight: 0.84 lb (381 g).

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, ,U.S.A. Fax: [phone] e-mail: [e-mail]

Phone: [phone] www.dwyer-inst.com

Lit-By Fax: [phone]

4. The previously stored free area will be displayed in the upper
corner of the LCD. To enter the new free area, press the AREA

button (Number 0). The lower four digits will become blank,
and the anemometer will wait for new entry.

5. Enter new free area by using the numerical keypad and then

press to end. The meter will automatically exit when all four
digits are entered.

6. Press the OPTION button several times until neither the AVE

nor the 2/3VMAX is showing on the LCD.

7. Determine approximate wind direction.

8. Hold vane so that wind passes through back to front. (See

arrows on inside of vane).

9. Wait two seconds in order to obtain stabilized output.

NOTE: The flow value equals velocity multiplied by free area.

HOW TO RECORD A SINGLE DATA SAMPLING

1. Select the (VEL) Velocity mode to measure wind velocity.
Set the sampling time by selecting the SAMPLE button
(Number 0) the previously stored sampling time will be
displayed in the upper LCD.

2. Enter ‘0’ as the sampling value for single data sampling.
Zero will be displayed on the LCD. Press the ENTER button
to accept ‘0’ as the sampling time.

3. Press the REC (Number 9) button to store the data
displayed on the LCD. Every time the REC button is
pressed, a single data point will be stored in memory. The
data is maintained in the memory even when battery is
replaced. (NOTE: Single point data sampling can also be

done in the FLOW mode. Follow above instructions for
VELOCITY sampling but be sure to put into FLOWmode.)

.

FLOW= VELOCITY x (FREE AREA)

HOW TO MEASURE WIND/AIR FLOW WITH 2/3VMAX
OPTION

1. Press the ON/OFF to turn on the anemometer.

2. Select desired function by pressing the VEL/FLOW button
(Number 4).
FLOW symbol should appear on the left of the LCD.

3. Select desired units of measurement (CFM or CMM) by
pressing the UNIT button (Number 3).

4. Any previously stored free area data will be displayed in the
upper LCD. To enter new free area data, press AREA button
(Number 0).The lower four digits will become blank. The
meter will wait for new entry. Enter free area by using
numerical key pad and then press ENTER when finished.
The meter will automatically exit entering mode if all four
digits are entered.

5. Once the free area is updated, press the OPTION button to
select the 2/3Vmax mode. the 2/3Vmax symbol will be
displayed in the upper LCD.

6. Determine approximate wind direction.

7. Hold vane so that wind passes through from the back to the
front.

8. Measure maximum velocity by moving around center of the
free area. The meter will record the maximum value and use
it to calculate the wind flow by the following equation:

FLOW=2/3 x max (VELOCITY) x (FREE AREA)

HOW TO OBTAIN AVERAGE WIND/AIR FLOW

1. Press the ON/OFF button to turn on the anemometer.

2. Select desired function by pressing the VEL/FLOW button
(Number 4). The FLOW symbol will appear in left corner of
the LCD.

3. Select the desired unit of measurement by pressing the UNIT
button (Number 3).

4. Any previously stored free area data will be displayed in the
upper LCD. To enter new data, press AREA button
(Number 0). The lower our digits will become blank. To enter
free area by using numerical keypad and then press ENTER
to accept. The meter will automatically exit entering mode
when all four digits are entered.

5. Once the new free area is updated, press the OPTION button
to select the AVE function. The AVE symbol is appear at the
top of the LCD.

6. Press the START button to clear the upper LCD.

7. Determine the approximate wind direction.

8. For the most accurate reading, keep the axis of the vane
within 20°of the wind direction.

9. Select a measuring point within free area. Once a point is

selected,press the NEXT button to average the wind flow.
The value is the four digit upper LCD will increment by one to
indicate how many points have been averaged. The maxi­mum number of points is 12. The averaged reading will be
appear on the larger 4 digit display on the LCD. The meter
will calculate the average wind flow by using the following
equation:

HOW TO CONTINUOUSLY RECORD DATA SAMPLING

1. Select the VEL (VELOCITY) mode (The FLOW mode can not
be continuously stored).

2. Press the SAMPLE button (Number 0) to change the
sampling time. The previously stored sampling time will
be displayed on the upper LCD.

3. Continuos sampling time can be set from 1 to 240 seconds
with a maximum number of 2000 records stored in memory.
Enter the desired time via the numeric keypad (1-240) and
press enter to accept new sampling time.

4. Press the REC button (Number 9) to begin data storage at
the specified sampling time. The REC symbol will be

displayed at the top of the LCD when the RECORD function-

tion is actuated. Data will maintained in the memory even
after the battery has been replaced.

5. To end recording, press the REC button (Number 9) again.

The REC symbol should not be displayed at this time. (NOTE:

Data will be lost if the REC button is not disabled before turn
ing off unit.)

HOW TO READ SEQUENTIALLY STORED DATA

1. Press the read button (Number 7) to read stored data in

memory. The READsymbol will be displayed in the upper
LCD.

2. The RECORD NUMBER will be indicated in the upper LCD

prior to displaying the data. Scroll through the data records
by pressing the READ button. The data will roll over to the
first record if the last record has been read.

3. To exit the READ mode, press the RESET button (Number 8).

HOW TO READ RANDOMLY STORED DATA

1. Access the READ mode by pressing the READ button

(Number 7). The READ symbol will appear at the top of the
LCD.

2. Press the SAMPLE button and enter the sample number to

be viewed. The record number will be displayed in the upper

LCD.

3. Press ENTER to select the displayed record number. The

data corresponding to that number will be displayed.

4. Press the RESET button (Number 8) to exit the READ
mode.

HOW TO DOWNLOAD SOFTWARE TO PC

FOR WINDOWS 3.1

1. Start Microsoft

TM

TM

WindowsTMon PC.

2. Insert disk into dive A (or B)

3. From PROGRAM MANAGER, select File menu and choose

Run.

4. Type a:\setup (or b:\setup) then press ENTER.

FOR WINDOWS 95

1. Start WINDOWS 95

TM

OR WINDOWS 98

TM

OR WINDOWS 98TM.

TM

2. Insert disk in drive A (or B).

3. Click Start button and select Run.

4. Type in a:\setup (or b:\setup) and then press Enter.

FLOW= 1/N ∑ (VELOCITY) x (FREE AREA)