Amprobe THWD-10 User manual

Users Manual
• Mode d’emploi
• Bedienungshandbuch
• Manual d’Uso
• Manual de uso
THWD-10 / THWD-10W
RH Meter
RH Meter with Wireless

THWD-10
THWD-10W
RH Meter
RH Meter with Wireless
Users Manual
June 2010, Rev.1
©2010 Amprobe Test Tools.
All rights reserved. Printed in Taiwan
English

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 address below).

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.
In USA In Canada
Amprobe Test Tools Amprobe Test Tools
Everett, WA 98203 Mississauga, ON L4Z 1X9
Tel: 877-AMPROBE (267-7623) Tel: [phone]
Non-Warranty Repairs and Replacement – Europe
European non-warranty units can be replaced by your Amprobe®
Test Tools distributor for a nominalv charge. Please check the
“Where to Buy” section on www.amprobe.com for a list of
distributors near you.
European Correspondence Address*
Amprobe® Test Tools Europe
In den Engematten 14
79286 Glottertal, Germany
Tel.: [phone] - 0
*(Correspondence only – no repair or replacement available from
this address. European customers please contact your distributor.)

THWD-10/THWD-10W RH Meter
THWD-10
RH Meter
13
12
11
10
4
1
6
3
2
5
7
8
9
THWD-10W
1) “ ” Power
2) °C /°F
3) “ ” backlight
4) “REL” Relative
5) “MAX/MIN” Record
6) “HOLD” Data Hold
7) “WB/DP” WB/DP/Ambient
temperature
8) “K/NTC/K-DP”
9) “SAVE” data save
10) “READ” data recall
11) Wireless(THWD-10W)
12) Display
13) Input

1) Humidity display
2) Temperature display
3) K type temperature
measurement mode
4) NTC temperature
measurement mode
5) K type temperature
minutes Dew point
temperature mode
6) Automatic power off
enabled
Screen Display
7) Low battery
8) Relative enabled
9) HOLD enabled
10) Maximum,Minimum,
Maximum-Minimum,
or average reading
displayed
11) Wet bulb or dew point
temperature displayed
12) Wireless function
enabled (THWD-10W)
2
7
8
9
6 1
4 53
12
10
11

1
CONTENTS
SYMBOLS............................................................................ 2
UNPACKING AND INSPECTION .......................................... 4
INTRODUCTION .................................................................. 4
Features .......................................................................... 4
OPERATION INSTRUCTIONS............................................... 5
““ Power Switch.......................................................... 5
“°C/°F” Selecting the Temperature Scale ..................... 5
“” Button.................................................................... 5
“REL” Button.................................................................. 5
“MAX/MIN” Button ....................................................... 5
“HOLD” Button .............................................................. 6
“WB/DP” Button ............................................................ 6
“K/NTC/K-DP” Button.................................................... 6
“SAVE” Button ............................................................... 7
“READ”, “ ”, “ ” Button........................................... 7
Wireless Mode................................................................ 7
SPECIFICATION.................................................................... 8
MAINTENANCE................................................................... 11

2
SYMBOLS
Caution! Refer to the explanation in this Manual
Complies with European Directives
Tested Comply With FCC Standards
Do not dispose of this clamp meter as unsorted
municipal waste.

WARNING and PRECAUTIONS
• To avoid electrical shock, do not use this instrument
when working voltages at the measurement surface
over 24V AC or DC.
• To avoid damage or burns, do not make
temperature measurement in microwave ovens.
• Repeated sharp exing can break the thermocouple
leads. To prolong lead life, avoid sharp bends in the
leads, especially near the connector.
• Do not immerse the hygrometer sensor head into
liquids since this causes permanent damage to the
sensor.
Federal Communications Commission
This device THWD-10W complies with Part 15 of the
FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any
interference received, including interference that may
cause undesired operation.

3
Note
This equipment THWD-10W has been tested and found
to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection. This
equipment generates, uses and can radiated radio
frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful
interference to radio communications. However, there
is no guarantee that interference will not occur in a
particular installation if this equipment does cause
harmful interference to radio or television reception,
which can be determined by turning the equipment
off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and
receiver.
• Connect the equipment into an outlet on a
circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV
technician for help.
Shielded interface cables must be used in order to comply
with emission limits.
Changes or modifications not expressly approved by the
party responsible for compliance could void the user’s
authority to operate the equipment.
Wireless Note
Wireless receiver must keep a distance at least 40cm from
the meter and meter to meter distance must be at least
30cm.

4
UNPACKING AND INSPECTION
Your shipping carton should include:
1 Meter
4 AAA batteries
1 Software CD ROM (THWD-10W)
1 USB Wireless Antenna (THWD-10W)
1 K type thermocouple
1 Manual
1 Plain white box
If any of the items are damaged or missing, return
the complete package to the place of purchase for an
exchange.
INTRODUCTION
The instrument hereafter referred to as “the Meter” is a
battery powered meter that measures relative humidity
and temperature. Through a few easy to use controls, the
Meter displays three different temperature points of the
air surrounding the meter’s sensor: ambient, wet bulb,
and dew point.
Features
• Wireless two ways transmission. (THWD-10W only)
• Highly stable humidity measurement ±2.5%.
• Processing %RH and temperature simultaneously.
• Two in one wide range thermometer and humidity
function.
• Wet/Dry bulb, dew point and %RH.
• Easy switching between K/NTC/K-DP.
• Max/Min/AVG/REL/HOLD function.
• APO function.

5
OPERATING INSTRUCTIONS
“ ” Power Switch
The “ ” key turns the thermometer on or off. In the SET
mode cannot be powered off. Exit SET mode to power
off.
APO function mode
Press “ ” power key for more than 4 seconds to disable
the auto-power function.
The display will show “APO OFF”.
“°C/°F” Selecting the Temperature Scale
Readings are displayed in either degrees Celsius(°C) or
degrees Fahrenheit(°F). When the thermometer is turned
on, it is set to the temperature scale that was in use
when the thermometer was last turned off. To change
the temperature scale, press the “°C/°F” key.
“ ” Button
Press the “ ” key to trigger on the backlight function,
press the ” ” key again to cancel the backlight
function. The backlight will switch-off automatically
after 30 seconds.
“REL” Button
Press the “REL” key to enter Relative mode, zero the
display, and store the displayed Reading as a reference
value and annunciator REL is displayed. Press “REL”
key again to exit the relative mode. In this mode, press
“HOLD” key to stop reading, all values are frozen, press
“HOLD” key again to restart reading.
“MAX/MIN” Button
Press “MIN/MAX” key to enter the MIN/MAX recording
mode and REC shows on the display. The beeper emits a
tone when a new minimum or maximum measurement is
recorded. Press “MIN/MAX” key again to cycle through

6
the current readings:
MAX: The highest measurement recorded.
MIN: The lowest measurement recorded.
MAX-MIN: The difference of the highest and the
lowest measurement.
AVG: The average values of the measurements.
Press “MIN/MAX” key over two seconds to exit the
function. In this mode, press “HOLD” key to stop
recording, all values are frozen, press “HOLD” key again
to restart recording. In this mode, the APO function and
other keys are disabled, excluding “HOLD” and Back-
light keys. Press and hold down the “MAX/MIN” key for
more than 2 seconds to exit the MAX/MIN function.
“HOLD” Button
Press the “HOLD” key to enter the data hold mode, the
“HOLD” annunciator is displayed at the center-left of
display. When data hold mode is selected, the meter held
the present readings and stops all further measurements.
Press the “HOLD” key again to cancel data hold mode,
causing meter to resume taking measurements.
“WB/DP” Button
In the NTC data Mode, the Meter displays ambient
temperature when first turned on. To display wet
bulb(WB) temperature, press “WB/DP” key once.
Press the “WB/DP” again to switch to dew point(DP)
temperature. Press “WB/DP” a third time returns the
Meter to ambient temperature.
“K/NTC/K-DP” Button
Press the “K/NTC/K-DP” key, the meter can cycle through
“K-TYPE”, “NTC”, “KDP”.
*K-DP = K-TYPE temperature minutes Dew point
temperature.

7
“SAVE” Button
The save function stores the %RH, K-TYPE, NTC, Wet
bulb, Dew point data in a nonvolatile memory. Press the
“SAVE” key to save the current data, the word SAVE is
displayed to indicate the data are saved. The build in
memory can store up to 256 data.
“READ”, “p”, “q” Button
To recall the readings from memory, press “READ” key.
To check the memorized data just to press “p” or “q”
until the desired memorized data is displayed. To return
the meter to normal operation, press “READ” key again.
* CLR SAVE DATA:
Pressing the “p” key for more than 5 seconds to clears
all the saved data in memory. And lower display show
“Clr” about 2 second.
Wireless Mode: (THWD-10W)
Press the “ ” key for more than two seconds to start
wireless function. Press the “ ” key again for another
two seconds to stop wireless function. The wireless mode
will shut down if there is no wireless signal for two
minutes.
To SET CH/ID to 00,00, press the “q” key and “ ”
power key for more than 6 seconds with the meter
powered down. The meter will set channel and ID to
00,00 status. The second display will show 00, which
means that the channel and ID has been set to 00.
To check the channel and ID of the meter
When the meter is off, press “°C/°F” key and “ ” for 5
seconds, LCD’s main display will show channel number,
the second display will show ID number.

8
SPECIFICATION
Electrical
Temperature
Scale
Celsius or Fahrenheit user-selectable
Measurement
Range
K-Type -50°C to 1000°C, (-50°F to
1832°F)
Resolution 0.1°C or 0.2°F
Accuracy Accuracy is specified for operating
temperatures over the range of 18°C
to 28°C (64°F to 82°F), for 1 year, not
including thermocouple error.
±(0.1% rdg + 1°C) on -50°C to 1000°C
±(0.1% rdg + 2°F) on -50°F to 1832°F
±(0.05% rdg + 1.4°F) -58°F to -328°F
Sensor Thermistor temperature sensor
Range 0°C to 60°C, (32°F to 140°F)
Resolution 0.1°C/°F
Accuracy ±2°C on 0°C to 10°C
±0.5°C on 10°C to 45°C
±2°C on 45°C to 60°C
±4°F on 32°F to 50°F
±1°F on 50°F to 113°F
±4°F on 113°F to 140°F
Relative Humidity
Sensor Capacitive Humidity Sensor
Range 0% to 100% RH
Accuracy ±2.5% at 25°C (77°F), 10% to 90% RH
±5% at 25°C (77°F), 0% to 10% RH,
90% to 100% RH

9
Sensor
Response Time
for 90% of Total
Range
60sec typical.
Sensor
Hysteresis
(excursion of
10% to 90% to
10% RH)
±1%RH typical
Temperature
Coefcient
0.1 times the applicable accuracy
specification per °C from 0°C to 18°C
and 28°C to 50°C
(32°F to 64°F and 82°F to 122°F).
Input Protection 24V dc or 24V ac rms maximum input
Voltage on any combination of input
pins.
Input Connector Accepts standard miniature
thermocouple connectors (flat blades
spaced 7.9mm, center to center).
Environmental
Ambient
Operating
Ranges
0°C to 50°C (32°F to 122°F) <80% R.H.
Storage
Temperature
-20°C to 60°C (-4°F to 140°F) <70% R.H.
General
Display 5 digit liquid crystal display (LCD).
Overload “----.-” or “OL” is display..
Reading Rate 1 time per second.

10
Auto power off 15 minutes, press power key to
resume operation.
Battery 4 X 1.5V AAA
Battery Life 200 hours typical with carbon zinc
battery.
Dimensions 160mm(H) x 83mm(W) x 38mm(D);
6.3 in (H) x 3.3 in (W) x 1.5 in (D).
Weight Approx. 230g (0.5lb) including
batteries.
Supplied Probe 4 feet type “K” thermocouple
bead wire (Teflon tape insulated).
Maximum insulation temperature
260°C (500°F).
Wire accuracy ±2.2°C or ±0.75% of
reading (whichever is greater) from
0°C to 800°C (32°F to 1472°F).
Wireless Features
Frequency range 910~920MHz (THWD-10W)
Low current consumption less than 1mA.
The transmitting distance can reach 25M without
magnetic interference.
- EMC: Conforms to EN61326-1.
This product complies with requirements of the
following European Community Directives: 89/ 336/
EEC (Electromagnetic Compatibility) and 73/ 23/ EEC
(Low Voltage) as amended by 93/ 68/ EEC (CE Marking).
However, electrical noise or intense electromagnetic
fields in the vicinity of the equipment may disturb the
measurement circuit. Measuring instruments will also
respond to unwanted signals that may be present within
the measurement circuit. Users should exercise care and
take appropriate precautions to avoid misleading results
when making measurements in the presence of electronic
interference.

11
MAINTENANCE AND REPAIR
WARNING
To avoid possible electrical shock, disconnect the
thermocouple connectors from the thermometer
before removing the cover.
Installing and Replacing Battery
A. Screw
B. Battery Cover
C. Battery
1. Power is supplied by 4pcs 1.5V (SIZE AAA) UM-4
R03.
2. The “ ” appears on the LCD display when
replacement is needed. To replace battery remove
screw from back of meter and lift off the battery
cover.
3. Remove the batteries from the battery
compartment and replace them with new ones.
4. When not use for long time, remove the battery.
5. Do not store the unit in place with temperature
and humidity beyond the recommended storage
temperature.
Cleaning
Periodically wipe the case with a damp cloth and
detergent, do not use abrasives or solvents.