Amprobe THWD-10 Operating Manual

THWD-10 / THWD-10W

RH Meter
RH Meter with Wireless

Users Manual

• Mode d’emploi

• Bedienungshandbuch

• Manual d’Uso

• Manual de uso

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

THWD-10W

1

4

7

10

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

12

11

2
3
5
6
8
9

8) “K/NTC/K-DP”

9) “SAVE” data save

10) “READ” data recall

11) Wireless(THWD-10W)

12) Display

13) Input

Screen Display

6 1

7
8

9

10

11

12

2

4 53

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

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)

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”, “

Wireless Mode ................................................................ 7

SPECIFICATION .................................................................... 8

MAINTENANCE ................................................................... 11

”, “ ” Button ........................................... 7

1

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.

2

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.

3

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.

4

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 ”

function. The backlight will switch-off automatically
after 30 seconds.

” key again to cancel the backlight

“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

5

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 Back­light 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.

6

“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.

7

”

SPECIFICATION

Electrical

Temperature
Scale

Measurement
Range

Resolution 0.1°C or 0.2°F

Accuracy Accuracy is specified for operating

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

Celsius or Fahrenheit user-selectable

K-Type -50°C to 1000°C, (-50°F to
1832°F)

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

±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

8

Sensor
Response Time
for 90% of Total
Range

Sensor
Hysteresis
(excursion of
10% to 90% to
10% RH)

Temperature
Coefcient

Input Protection 24V dc or 24V ac rms maximum input

Input Connector Accepts standard miniature

60sec typical.

±1%RH typical

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).

Voltage on any combination of input

pins.

thermocouple connectors (flat blades
spaced 7.9mm, center to center).

Environmental

Ambient
Operating
Ranges

Storage
Temperature

0°C to 50°C (32°F to 122°F) <80% R.H.

-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.

9

Auto power off 15 minutes, press power key to

Battery 4 X 1.5V AAA

Battery Life 200 hours typical with carbon zinc

Dimensions 160mm(H) x 83mm(W) x 38mm(D);

Weight Approx. 230g (0.5lb) including

Supplied Probe 4 feet type “K” thermocouple

Wireless Features

Frequency range 910~920MHz (THWD-10W)
Low current consumption less than 1mA.
The transmitting distance can reach 25M without
magnetic interference.

resume operation.

battery.

6.3 in (H) x 3.3 in (W) x 1.5 in (D).

batteries.

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).

 - 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.

10

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 “
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.

” appears on the LCD display when

Cleaning

Periodically wipe the case with a damp cloth and
detergent, do not use abrasives or solvents.

11