Amprobe WT-20 User manual

Users Manual
• Mode d’emploi
• Bedienungshandbuch
• Manual d’Uso
• Manual de uso
WT-20
Conductivity TDS Meter

WT-20
Conductivity TDS Meter
Users Manual
July 2009, Rev.1
©2009 Amprobe Test Tools.
All rights reserved. Printed in China
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.)

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1) Battery Cover
2) Lcd Display
3) Power / Set Key
4) Hld / Cal / Down Key
5) Mode / Up Key
6) Electrode Cover
7) Conductivity Reading
(unit: uS or mS ) or TDS
Reading (unit: ppt or
ppm)
8) Display temperature in
either degree Celsius or
degree Fahrenheit
9) Calibration Mode
Indicator
10) Freeze Display
11) Low Battery Indicator
POWER / SET - Power on/off, Enter setting mode
(push 2 sec), Enter while in setting mode.
MODE / q Key - Conductivity/TDS mode switch,
Roll up while in setting mode
HLD / CAL /p Key - Freeze display, Calibration
function, Roll down while in setting mode
WT-20 Conductivity TDS Meter

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CONTENTS
SYMBOLS.......................................................................... 2
UNPACKING AND INSPECTION ....................................... 2
INTRODUCTION ................................................................ 3
Features ........................................................................ 3
OPERATION....................................................................... 3
Auto Power Off ........................................................... 4
Setup ............................................................................ 5
Calibration Mode ........................................................ 7
Conductivity Calibration ............................................. 7
TDS Calibration ........................................................... 9
SPECIFICATION ................................................................. 10
MAINTENANCE AND REPAIR ........................................... 11
Battery Replacement .................................................. 12
TROUBLE SHOOTING ....................................................... 13
Appendix A .................................................................. 15
Appendix B .................................................................. 15
Appendix C .................................................................. 16

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SYMBOLS
Caution! Refer to the explanation in this Manual
Conforms to relevant Australian standards
Complies with European Directives
Do not dispose of this clamp meter as unsorted
municipal waste. Contact a qualified recycler for
disposal.

WARNING and PRECAUTIONS
• Do not make the air bubble adhere on the
electrode. That may cause inaccurate reading.
• Do not operate the meter in ammable liquid.
UNPACKING AND INSPECTION
Your shipping carton should include:
1 WT-20 meter
4 LR44 battery
1 Manual
If any of the items are damaged or missing, return
the complete package to the place of purchase for an
exchange.

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INTRODUCTION
Congratulations on your purchase of WT-20 Conductivity
TDS meter. A convenient instrument to measure water
conductivity, TDS and temperature.
Features
• IP65 Waterproof housing.
• Dual display with ATC (°C / °F switchable)
• Data hold to freeze display.
• Low battery indicator.
• Auto power off.
• One touch only for calibration.
OPERATION
1. Remove the electrode cover to expose the
electrode out.
2. Press “POWER” to power on. LCD will display
parameters (ex: tnr, tCo, tds, rAn) in turns and
then enter normal display.
3. The meter is default in auto-ranging status. Press
“MODE“ key more than 2 seconds can manually
select the range when the meter is in normal
measurement mode.
4. Set the temperature coefficient to the right value.
WT-20 is factory set to 2.1% per °C. if needed, see
P1.3 to set the temperature coefficient.
5. Select the normalization temperature. WT-20 is
factory set to 25 °C. See P1.2 to change it to 20 °C.
6. Rinse the probe with deionized or distilled water
before use to remove any impurities adhering
to the electrode. Soak the probe more than 30
minutes to clear up the lazy effect of probe if the
meter is stored for a long time.

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7. Dip the probe into the sample container. Make
sure no air bubbles trapped in the slot of the
probe. To remove air bubbles, give the probe
a gentle stir. Making sure the electrode tip is
submerged when you stir it.
8. Stir the probe gently in the sample to create a
homogenous sample. Allow a few seconds to reach
temp. equilibrium. Wait about 15 minutes can get
a stable reading.
9. The unit of conductivity will flash on the LCD to
indicate the meter is in measurement mode. When
the reading is stable, the unit will stop flashing.
(Fig1)
10. Press “HLD” to freeze display. “Hold” will appear
on the LCD. (Fig.2) Press “HLD” again to release.
11. TDS Measurement:
In measurement mode, press ”MODE“ to switch
to DS mode. The unit of conductivity are uS or mS.
The unit of TDS are ppm or ppt.
Set the TDS conversion factor to right value. The
factory default is 0.50 To change the TDS factors,
refer Appendix A.
12. Turn off the meter by pressing “POWER“ key.
Auto Power Off
This meter will shut off automatically 20 minutes of
inactivity. To disable the auto power off, pressing “SET“
+ “HLD” keys simultaneously while turning on the meter
until a “n” appeared on the screen and then release keys
to return to normal mode.(Fig.3)

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Setup
The advanced setup mode lets you customize your meter.
4 types parameter are available.
P1.0: temperature parameter setting (t)
P1.1: Change temperature unit (tUt)
P1.2: Normalization temp.(tnr)
P1.3: Temp. Coefficient (tCo)
P2.0: TDS factor setting
P2.1: Setting TDS factor (tds)
P3.0: Reset meter (rSt)
P3.1: Reset
P4.0: Review Calibration Info. (CAL)
P4.1: Review range 1 calibration information
P4.2: Review range 2 calibration information
P1.1: Change temperature unit (tUt):
1. When in measurement mode, press “SET“ more
than 2 sec to enter setup mode. Press “q“or “p“
to select P1.0, press “SET“ to enter or press “SET“
for more than 2 seconds to quit.
2. Press “p“ to select C or F.
3. Press “SET“ to confirm or press “SET“ more than 2
sec to return to P1.0 without saving.
P1.2: Normalization temp.(tnr):
After saving temp. unit, the meter will automatically
enter normalization temp. adjustment. Press “p“ to
change the temperature to 20°C or 25°C. Press “SET“
to confirm and or press “SET“ more than 2 sec to
return to P1.0 without saving.