Amprobe TMA-21HW User manual

1
Users Manual
• Mode d’emploi
• Bedienungshandbuch
• Manual d’Uso
• Manual de uso
TMA-21HW
Hot-Wire Anemometer
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

TMA-21HW
Hot-Wire Anemometer
Users Manual
June 2010, Rev.1
©2010 Amprobe Test Tools.
All rights reserved. Printed in Taiwan
English
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

Limited Warranty and Limitation of Liability
Your Amprobe product will be free from defects in material and workmanship for 1
year from the date of purchase. This warranty does not cover fuses, disposable batteries
or damage from accident, neglect, misuse, alteration, contamination, or abnormal
conditions of operation or handling. Resellers are not authorized to extend any other
warranty on Amprobe’s behalf. To obtain service during the warranty period, return the
product with proof of purchase to an authorized Amprobe Test Tools Service Center or
to an Amprobe dealer or distributor. See Repair Section for details. THIS WARRANTY
IS YOUR ONLY REMEDY. ALL OTHER WARRANTIES - WHETHER EXPRESS, IMPLIED OR
STAUTORY - INCLUDING IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE
OR MERCHANTABILITY, ARE HEREBY DISCLAIMED. MANUFACTURER SHALL NOT BE LIABLE
FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES,
ARISING FROM ANY CAUSE OR THEORY. Since some states or countries do not allow the
exclusion or limitation of an implied warranty or of incidental or consequential damages,
this limitation of liability may not apply to you.
Repair
All test tools returned for warranty or non-warranty repair or for calibration should be
accompanied by the following: your name, company’s name, address, telephone number,
and proof of purchase. Additionally, please include a brief description of the problem or
the service requested and include the test leads with the meter. Non-warranty repair or
replacement charges should be remitted in the form of a check, a money order, credit
card with expiration date, or a purchase order made payable to Amprobe® Test Tools.
In-Warranty Repairs and Replacement – All Countries
Please read the warranty statement and check your battery before requesting repair.
During the warranty period any defective test tool can be returned to your Amprobe®
Test Tools distributor for an exchange for the same or like product. Please check the
“Where to Buy” section on www.amprobe.com for a list of distributors near you.
Additionally, in the United States and Canada In-Warranty repair and replacement units
can also be sent to a Amprobe® Test Tools Service Center (see next page for address).
Non-Warranty Repairs and Replacement – US and Canada
Non-warranty repairs in the United States and Canada should be sent to a Amprobe® Test
Tools Service Center. Call Amprobe® Test Tools or inquire at your point of purchase for
current repair and replacement rates.
*(Correspondence only – no repair or replacement available from this address. European
customers please contact your distributor.)customers please contact your distributor.)
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

TMA-21HW Hot-Wire Anemometer
1Air velocity sensor.
2Temperature and RH sensor.
3Telescoping probe.
4Display.
5Power key : Push power key to turn the meter on or off.
6 H Hold key : Push HHold key to freeze or unfreeze the display reading.
In Hmode, push “VEL %RH” key to select the desired unit of display.
1
2
3
7
5
4
6
8
9
14
12
11 13
10
17
15
16
15
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

7key : Push key to turn on and off the backlight.
8MX/MN key : Push “MX/MN” key to circulate the reading of Maximum,
Minimum, Average and Current record mode. Push “MX/MN” key for 2 seconds
to exit this mode.
9 SET key : Push “SET” key to enter setting mode.
• Air velocity unit setting mode.
• Flow setup mode.
• Real – Time setting mode.
• Select a time constant mode.
• Select auto data memory interval time mode.
• Auto power off time setting mode.
• Backlight time setting mode.
• Standard pressure setting mode.
• Calibration mode.
10 VEL %RH key: Push “VEL %RH” key to circulate the display of following
reading:
Screen 1: Air Velocity display
Flow setup display
Air Flow display
Screen 2: %RH (Relative Humidity) display
Temperature display
WET (Wet bulb temperature) display
Screen 3: Air Velocity display
DEW (Dew point temperature) display
WCT (Wind chill temperature) display
Screen 4: %RH (Relative Humidity) display
HI (Heat index) display
HD (Humidex) display
Note:
Heat Index:
The Heat Index is determined using the dry bulb temperature and relative
humidity.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

It is based upon charts available from the U.S. National Weather Service.
The Heat Index represents how an average person feels relative to climate
conditions. For a given temperature, the higher the humidity, the higher the heat
index will be.
The Heat Index is defined over a temperature range of 70°F to 120°F (21°C to
49°C) and a relative humidity range of 30% to 99%. Outside of this range, the
meter will show dashes in the display for the Heat Index.
Humidex :
The Humidex, use primarily in Canada, works on the same concept as the
Heat Index. The values are slightly different. The Humidex is defined over a
temperature range of 70°F to 109°F (21°C to 43°C) and a relative humidity range
of 20% to 99%. Outside of this range, the meter will show dashes in the display
for the Humidex.
Wind Chill Temperature:
The Wind chill temperature (Twc), use by the U.S. and Canadian weather services,
which is determined by iterating a model of skin temperature under various wind
speeds and temperatures.
The Wind chill temperature is defined over a temperature range of -58°F to +41°F
(-50°C to +5°C) and a wind speed above 176 ft/m (0.9m/s). Outside of this range,
the meter will show dashes in the display for the Wind chill temperature.
11 FLOW key : Push “FLOW” key to select desired air velocity to determine the Air
Flow.
• 2/3V MAX : Use the maximum reading obtained to determine the 2/3V MAX
Air Flow.
• AVG : Use the average reading to determine the Air Flow.
• Use the current reading to determine the Air Flow.
12 ↵key : Enter / Exit a setting mode or store the displayed setting.
13 Test ID key : A group of samples. The statistics (maximum, minimum, average
and count) are calculated for each TEST ID. The total number of TEST IDs is 10.
Push “Test ID” key to select the desired TEST ID number from 0 to 9.
14 AUTO MEM key :
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

• In the setting mode, push this key move ashing cursor to left.
• In the TEST ID 0 to 4 mode, push this key one time store the one data to
memory.
• In the TEST ID number 5 to 9 mode, push this key to start auto data memory
mode, push this key again to exit this mode.
15  keys :
• In the setting mode, push “” keys to increase or decrease the displayed
setting.
• In the READ mode, push “” keys to select increase or decrease the
memory address.
• In the temperature display mode, push °C or °F key to switch the units
between Celsius (°C) and Fahrenheit (°F).
16 READkey :
• In the setting mode, push this key move ashing cursor to right.
• Push this key to enter the data memory READ mode; push this key for 2
seconds to exit this mode.
17 Sensor protection tube.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

Description of Display
FLOW SET UP
DISPLAY
MEMORY DISPLAY
TEMPERATURE &
AIR FLOW
DISPLAY
AIR VELOCITY &
HUMIDITY DISPLAY
Air Velocity Display :
:Auto power off indication.
H:Data hold indication.
SET :Setting mode indication.
REC :Record mode and current air velocity measured display indication.
REC MAX : Maximum air velocity measured display indication.
REC MIN : Minimum air velocity measured display indication.
REC AVG : Average air velocity measured display indication.
(The average of the last 30 samples)
Air Velocity Units :
knots
mile/hr : Miles per hour
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

km/hr : Kilometers per hour
ft/min : Feet per minute
Bft : Beaufort scale
m/s : Meters per second
Temperature & Flow Set Up Display :
: Round Duct diameter dimension indication.
X : Rectangle Duct X dimension indication.
Y : Rectangle Duct Y dimension indication.
D.H : Day – Hour
Kf : K factor indication.
AREA : Duct Area indication.
DEW : Dew point temperature indication.
HI : Heat index temperature indication.
m2 : Square meters
ft2 : Square feet
in : Inches
cm : Centimeter
Pressure units inHg : inch of mercury
mmHg : millimeter of mercury
Temperature units °C : Degree Celsius
°F : Degree Fahrenheit
Temperature & Air Flow Display :
2/3V MAX : 2/3V Maximum mode is selected indication.
m : s : minute : second
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

AVG : Average mode is selected indication.
:Current mode is selected indication.
WET : Wet bulb temperature indication.
WCT : Wind chill temperature indication.
HD : Humidex temperature indication.
x 10 : Multiply reading by ten.
x 100 : Multiply reading by one hundred.
x 1000 : Multiply reading by one thousand.
ft3/min : Cubic feet per minute.
m3/min : Cubic meters per minute.
Memory Display :
TEST ID 0 – 4 : Manu data memory indication.
TEST ID 5 – 9 : Auto data memory indication.
SAMLE : Data memory number address indication.
: Total average data number indication.
M : Data memory indication, Mdisplay one time store one data into the
memory.
R : Data read mode indication.
TC s : Average time constant indication.
INTV : Auto data memory interval time indication.
:Low battery indication.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

CONTENTS
SYMBOLS...............................................................................................................1
UNPACKING AND INSPECTION .............................................................................1
INTRODUCTION .....................................................................................................2
Applications.......................................................................................................2
Feature...............................................................................................................2
OPERATION............................................................................................................3
Getting Started .................................................................................................3
Settings and Calibrations..................................................................................3
Air Velocity Measurement................................................................................8
Air Flow Measurement .....................................................................................8
Humidity and Temperature Measurement......................................................9
MAX/MIN/AVG Recording Measurement ........................................................9
Manual Data Memory and Read Mode ...........................................................9
Manual Data Memory and Read Mode ..........................................................10
Air Flow Auto Data Memory and Read Mode ................................................10
Clearing Memory ..............................................................................................11
SPECIFICATION.......................................................................................................11
MAINTENANCE AND REPAIR ................................................................................14
Cleaning...........................................................................................................14
Trouble shooting...............................................................................................14
Battery and Fuse replacement .........................................................................14
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

1
SYMBOLS
Caution ! Risk of electric shock
Caution ! Refer to the explanation in this Manual
Please remove all the test leads before preforming maintenance,
cleaning, battery replacement, fuse replacement, etc
Complies with European Directives
Conforms to relevant Australian standards
Do not dispose of this product as unsorted municipal waste.
Contact a qualified recycler for disposal
WARNING and PRECAUTIONS
• Do not operate the meter in explosive gas (material), combustible gas
(material) steam or filled with dust.
• When using the meter to check air ow, make sure that you can safely
raise and hold the meter while making measurements. Be careful when
working on a ladder.
•Observe all necessary precautions so that the unit does not become
caught in moving machinery or touch any exposed electrical wiring.
•The meter is not designed for use in gas mixtures other than air. Use
with corrosive or other dangerous or explosive gas mixtures is not
recommended.
UNPACKING AND INSPECTION
Your shipping carton should include:
1 TMA-21HW Hot-Wire Anemometer
1 Users Manual
6 AAA batteries
1 Carrying case
If any of the items are damaged or missing, return the complete package to
the place of purchase for an exchange.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

2
INTRODUCTION
The TMA-21HV Portable Air Velocity Meter is a lightweight versatile
instrument that can be used anywhere to measure air velocity,
temperature, and relative humidity. It can also calculate the volumetric
ow rate, dew point temperature, wet bulb temperature, wind chill
temperature, humidex temperature and Heat index temperature. The
meter uses a telescoping probe. Applications include hood velocity, clean
rooms, OSHA compliance, ventilation ducts and outlets, heating and air –
conditioning, wind tunnels, product development, air – ow research and
mass – ow measurement in ducts.
Applications
• HVAC system performance
• Commissioning
• Plant maintenance
• Critical environment certication
• Duct traverses
Feature
• Fast response probe.
• Air ow volume.
• Instant / Avg / V max ow measurement.
• Velocity m / s, f t / min, knots, km / hr, mph, Bft.
• Temperature and relative humidity measurement.
• Calculate dew point temperature, wet bulb temperature, wind chill
temperature, humidex temperature and heat index temperature.
• Data hold & Maximum / Minimum / Average function.
• Manual data memory and read function (5x99 sets).
• Auto data memory and read function (5x99 sets).
• LCD triple display.
• Auto power off function ON / OFF Time setting.
• Backlight function ON / OFF Time setting.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

3
• Telescoping probe.
• Simple and safe to use.
• U.S. Pat. No. Des. 446,135
OPERATION
Getting Started
1. Installing the Batteries
Insert (6) AAA batteries as indicated by the diagram located on the inside of
the battery compartment.
2. Extending the Probe
To extend the probe, hold the handle in one hand while pulling on the probe
tip with the other hand. Do not hold the cable while extending the probe as
this prevents the probe from extending.
3. Using the Snake Telescoping Probe
The snake telescoping probe contains the air velocity sensor. When using the
probe, remove the sensor protection cap then rotate or bend the snake tube,
make sure the sensor window is fully exposed and the orientation is facing
upstream.
4. Retracting the Probe
To retract the probe, hold the handle in one hand while pushing on the probe
tip with the other hand. If you feel the probe antenna binding, pull gently on
the probe snake tube until the snake tube section is retracted. Collapse the
rest of the antenna by pushing the probe tip.
Settings and Calibrations
Air Velocity Unit Setting mode
• Push key to turn on the meter.
• Push “SET” key one time to enter this mode, the “
SET
” symbol is
displayed.
• Push “
 ” and “  ” keys to select the desired measurement unit.
• Push “
↵ ” key to store the choice.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

4
• Push “SET” key several times until the “
SET
” symbol is disappeared
to exit the setting mode.
Flow Set Up mode
•Push key to turn on the meter.
•Push “UNIT” key to select the desired measurement unit.
•Push “SET” key one time to enter the Flow Setup mode, the “ SET ”
symbol is displayed.
There are 4 types : Round Duct ( ), Rectangle Duct ( ), Duct Area
(AREA), and K factor (Kf).
•Push “” and “” keys to scroll through the choices and push “↵” key to
confirm your choice.
If round duct is chosen, the “ ” symbol will displayed.
Use and keys to setting the size (diameter) from 1.0 to 635.0 cm
or 1.0 to 250.0 inches. Push “↵” key to store the value.
If rectangle duct is chosen, the “ X” symbol will displayed.
Use and keys to setting the X – size of the duct, then push “↵”
key to store the value and advance to the next dimension, the “ Y”
symbol will displayed. Use and keys to setting the Y – size of
the duct, then push “↵” key to store the value.
If duct area is chosen, the “AREA” symbol will displayed. Use and
keys to setting the value and decimal point of the duct area from 0.001
to 9999ft2 or 929m2, then push “↵” key to store the value.
If K factor is chosen, the “Kf” symbol will displayed. Use and 
keys to setting the value and decimal point of the K factor from 0.001 to
9999, then push “↵” key to store the value.
Note : Kf is the number by which the meter multiplies the velocity
measurement to display volume.
•Push “ SET ” key several times until the “ SET ” symbol is disappeared to
exit the setting mode.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

5
Real – Time Setting mode
• Push key to turn on the meter.
• Push “SET” key three times to enter this mode, the “ SET ” and D-H, m:s
symbol are displayed.
• Push  key three times move to the two icking digits to day.
• Push “” and “” keys to set the day of the real – date.
• Push “” key move to the two icking digits to hour.
• Push “” and “” keys to set the hour of the real – time.
• Push “” key move to the two icking digits to minute.
• Push “” and “” keys to set the minute of the real – time.
• Push “” key move to the two icking digits to second.
• Push “” and “” keys to set the second of the real – time.
• Push “↵” key to stored these setting.
• Push “SET” key several times until the “ SET ” symbol is disappeared to
exit the setting mode.
Select a Time Constant mode
• Push “SET” key two times to enter this mode, the “TC” symbol and the
current time constant are displayed.
• Push and keys to scroll through the choices and push “↵” key to
store the choice. The choice for the time constant are : 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 15, 20, 25 and 30 seconds.
• Push “SET” key several times until the “ SET ” symbol is disappeared to
exit the setting mode.
The time constant is an averaging period. It is used to dampen the
display. If you are experiencing uctuating ows, a longer time constant
will slow down those uctuations.The average method is also referred to
as a “moving average”.
Select a Auto Data Memory Interval Time mode
• Push “SET” key three times to enter this mode, the “INTV” symbol and
the current interval time are displayed.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

6
• Push “” and “” keys to scroll through the log interval choices. The
choice are : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 and 30 seconds, and 1, 2,
3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30 and 60 minutes. Push “↵” key to store
the choice.
• Push “SET” key several times until the “ SET ” symbol is disappeared to
exit the setting mode.
Auto Power Off Time Setting mode
• Push “SET” key four times to enter this mode, the “APO” symbol and the
current auto power off time are displayed.
• Push “” and “” keys to setting the desired auto power off time from
1 to 50 minutes or setting to “– – m” for disable this function. Push “↵”
key to store the setting.
• Push “SET” key several times until the “ SET ” symbol is disappeared to
exit the setting mode.
Backlighting Time Setting mode
• Push “SET” key five times to enter this mode, the “bL” symbol and the
current backlight time are displayed.
• Push “” and “” keys to setting the desired backlight time from 1 to
50 seconds or setting to “– – s” for disable this function. Push “↵” key to
store the setting.
• Push “SET” key several times until the “ SET ” symbol is disappeared to
exit the setting mode.
Barometric Pressure Setting mode
• Push “SET” key eight times to enter this mode, the “ SET ” and “mmHg”
or “inHg” symbols are displayed.
• Push , , and keys to setting the actual barometric pressure value.
• Push “↵” key to store the value.
• Push “SET” key several times until the “ SET ” symbol is disappeared to
exit the setting mode.
The actual barometric pressure must be entered to convert air velocity
and volume measurements to actual conditions.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

7
Calibration mode
• Push “SET” key six times to enter this mode, the “USEr CAL no” symbol is
displayed.
• Push “” and “” keys to select “ ” symbol is displayed.
• Push “↵” key to enter the temperature calibration mode, the current
temperature reading and the current temperature scale factor value are
displayed.
• Push , , and keys to setting the scale factor value until the
temperature display reading reaching desired value.
• Push “↵” key to store the scale factor value, the “CAL PASS” symbol will
display one second, and enter the reset to factory default temperature
calibration value mode, the “dEF CAL no” symbol is displayed.
• Push “” or “” key to select “ ” or “ ”, if select “ ” then
push “↵” key will reset to factory default calibration value and enter the
air velocity zero calibration mode, the “CAL 0” symbol is displayed.
• Rotate the sensor protection tube to close the sensor window, until the air
velocity reading is stable then push “↵” key to store the zero air velocity
reading, and enter the air velocity scale factor calibration mode, the scale
factor value is displayed.
• Rotate the sensor protection tube, make sure the sensor window is fully
exposed. Insert the meter probe into the tunnel with the sensor window
toward the air ow. Secure the probe rmly with the velocity sensor
placed where air speed is known.
• Push , , and keys to setting the scale factor value until the display
reading reaching desired value, then push “↵” key to store the scale
factor value, the “CAL PASS” symbol will display one second, and enter
the reset to factory default air velocity calibration value mode, the “dEF
CAL no” symbol is displayed.
• Push “” or “” key to select “ ” or “ ”, if select “ ” then
push “↵” key will reset to factory default calibration value and enter the
humidity calibration mode, the current humidity reading and the current
humidity scale factor value are displayed.
• Push , , and keys to setting the scale factor value until the
humidity display reading reaching desired value.
• Push “↵” key to store the scale factor value, the “CAL PASS” symbol
will display one second, and enter the reset to factory default humidity
calibration value mode, the “dEF CAL no” symbol is displayed.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

8
• Push “” or “” key to select “ ” or “ ”, if select “ ” then
push “↵” key will reset to factory default calibration value and exit
setting mode.
Air Velocity Measurement
• Push key to turn on the meter.
• The display will show the air velocity reading directly on the Air Velocity
Display.
• Push “ HHOLD” key to freeze or unfreeze the display readings. In
HOLD mode, the “ H” symbol is displayed and push “VEL %RH” key to
circulate the display of the other reading.
Air Flow Measurement
AIR FLOW = (AIR VELOCITY) x (AREA)
• Push key to turn on the meter.
• The display will show the air velocity reading directly on the air velocity
display.
• The ow type setting is displayed on the ow set up display.
• Push “FLOW” key to select the desired 2/3V MAX mode, AVG mode or
current mode.
If 2/3V MAX mode is chosen, the “2/3V MAX” symbol will displayed. The
meter will use the maximum air velocity value obtained to determine the
2/3V MAX Air Flow.
If average mode is chosen, the “AVG” symbol will displayed. The meter
use air velocity average value (the last 30 samples) obtained to determine
the Average Air Flow.
If current mode is chosen, no symbol will displayed. The meter will use
the current air velocity value obtained to determine the Current Air Flow.
• The display will show the air ow reading directly on the Air Flow Display.
Humidity and Temperature Measurement
• Push key to turn on the meter.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]

9
• The display will show the air velocity reading on the air velocity display.
• Push “VEL %RH” key to circulate the display of the following reading :
Relative Humidity measurement value (%RH),
Temperature measurement value (°C, °F),
Wet bulb temperature calculated value (WET),
Dew point temperature calculated value (DEW),
Wind chill temperature calculated value (WCT),
Heat index temperature calculated value (HI),
Humidex temperature calculated value (HD).
MAX/MIN/AVG Recording Measurement
• Push “MX/MN” key to enter the recording mode, the “ REC ” symbol is
displayed and the auto power off function will be auto cancelled.
• Push “MX/MN” key to circulated the display of the maximum ( REC MAX
), minimum ( REC MIN), average ( REC AVG ) and current ( REC ) air
velocity and humidity reading via push “VEL %RH” key.
• Push “ HHOLD” key to paused recording, the “ H” symbol is displayed,
push “ HHOLD” key again will resume recording.
• Push “MX/MN” key for 2 seconds to exit this mode.
Manual Data Memory and Read Mode
TEST ID 0 Memory Mode :
• Push “Test ID” key to select the “TEST ID 0” memory.
• Push “AUTO MEM” key each time, one set of reading to will be stored
to the memory. At this moment, display will show the “ M” symbol one
time and the memory address number. Total memory size is 99 sets.
• Push “READ” key to enter READ mode, the display will show “ R”
symbol and the memory address number. Push or key to select the
desired memory address number data for display.
• Push “READ” key for 2 seconds to exit this mode.
www.GlobalTestSupply.com
Find Quality Products Online at: [e-mail]