Amprobe WT-50 User Manual

WT-50

Dissolved Oxygen
Water Quality Meter

Users Manual

• Mode d’emploi

• Bedienungshandbuch

• Manual d’Uso

• Manual de uso

WT-50

Dissolved Oxygen
Water Quality Meter

Users Manual

September 2009, Rev.1
©2009 Amprobe Test Tools.
All rights reserved. Printed in China

English

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 In­Warranty repair and replacement units can also be sent to a Amprobe® Test Tools Service Center
(see below 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.

In USA In Canada
Amprobe Test Tools Amprobe Test Tools
Everett, WA 98203 Mississauga, ON L4Z 1X9
Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]

Non-Warranty Repairs and Replacement – Europe

European non-warranty units can be replaced by your Amprobe® Test Tools
distributor for a nominal charge. Please check the “Where to Buy” section on
www.amprobe.com for a list of distributors near you.

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.)

WT-50 Dissolved Oxygen Water Quality Meter

Probe connection & IrDA ports

1

LCD display

2

DC adaptor port

3

USB port

4

Operation keys

5

Battery cover (rear side)

6

Tripod mount hole (rear side)

7

DO probe

8

Primary screen displays

1

DO concentration

Temperature display

2

Date & Time display

3

Memory counter

4

Low battery indicator

5

6

Units of barometric pressure

Unit of salinity value

7

Freeze data

8

Stable readings indicator

9

10

Calibration mode

11

Memory Recall mode

12

Memory max/min./average review

POWR/SET KEY: Press key to turn on and off the meter. When

the meter is off, hold down for few seconds to enter setting mode

CAL/ESC KEY: Press to switch normal and calibration mode. While
in calibration, setting or recall mode, press to return to previous mode.

HOLD/REC KEY: Press key to freeze current reading. Press again
to unlock. Press >1 second to switch normal and recall mode. When
the meter is off, press SET+HOLD simultaneously >1second to disable
auto-sleep mode.

MODE/UP KEY: Press this key to switch % and ppm (or mg/l). In setting
mode, press to increase value.

MEMORY/DOWN KEY: Press to record current reading. In setting
mode, press to decrease the value.

MAX/MIN/AV/ENTER KEY: Press to view the max./ min. and average
of the memory in recall mode. In setting or calibration mode, press
to confirm and enter next step. Press with HOLD/REC key to activate
backlight.

WT-50 Dissolved Oxygen Water Quality Meter

CONTENTS

SYMBOLS ...............................................................................................................2

UNPACKING AND INSPECTION .............................................................................2

INTRODUCTION .....................................................................................................3

Features .............................................................................................................3

OPERATION ...........................................................................................................3

Auto Power Off ................................................................................................4

Set Up ................................................................................................................5

Calibration Mode .............................................................................................7

USB Interface Capabilities ...............................................................................7

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

MAINTENANCE AND REPAIR ................................................................................9

To Replace membrance ....................................................................................9

To Replace electrolyte solution ........................................................................10

TROUBLESHOOTING ..............................................................................................10

APPENDIX ..............................................................................................................11

MSDS of ELECTROLYTE .........................................................................................12

1

SYMBOLS

Caution ! Refer to the explanation in this Manual



Conforms to relevant Australian standards



Complies with European Directives



Do not dispose of this product as unsorted municipal waste.



Warning and precaution

• Always rinse the probe with deionized water or rinse solution for best

accuracy.

• Do not touch the membrance.

UNPACKING AND INSPECTION

Your Shipping carton should include:

1 WT-50 Dissolved Oxygen Meter

1 Dissolved Oxygen probe

4 AAA batteries

10 Teflon on membrane

10 O-rings

2 Electrolyte solution

1 Syringe needle

1 Manual

1 Hard carrying case

If any of the items are damaged or missing, return the complete packag to the
place of purchase for an exchange.

2

INTRODUCTION

Thank you for purchasing WT-50 Dissolved Oxygen meter. The meter measures
DO concentration with temperature compensation, salinity and pressure
correction, which is an accurate instrument for water quality testing. The
handy size and extension probe enables on-site testing and the memory and
PC link function are also ideal for data collection and processing.

Features

• Accurate dissolved oxygen measurement

• Salinity and barometric pressure compensation

• 100% air saturation calibration

• 99 point memory

• Real time clock for data record

• USB interface for data transmission

OPERATION

1. Press “POWER/SET” to turn on and off the meter.

2. Press “MODE” to select DO scale between % and ppm (or mg/l).

3. Perform 100% air saturation calibration before measurement. (See page 7)
If the stable readings (15 minutes after power on) are within 100%+/-0.5%,
then no need to do the calibration.

4. Salinity and barometric pressure have effects on DO accuracy. The meter
default is 760mmHg in pressure and 0.0ppt in salinity. Correct salinity
value of water and barometric pressure in Setup P3.0 if the conditions of
measuring site are different.

5. Immerse the probe head in the liquid and it display DO concentration on the
LCD. Automatic Temperature Compensation takes several minutes to
equalize temperatures of the probe and liquid and get stable readings.

6. Press “HLD/REC” in measuring mode to hold the current readings. HLD icon
will be displayed on LCD. Press the button again to resume measuring.

7. Press “HLD/REC” and “MNX/AV” simultaneously to activate backlight.
It turns off automatically after 10 seconds.

3

8. Switch READY indicator on or off in SETUP P4.0. When ready indicator is
switch on, READY icon is fleshing on the left of screen while measuring and
stops when reading gets stable.

9. Press “MEM” to store the current reading with real time information. The
display will flash several times and the memory counter will increase by one.

(Fig. 1)

10. Recall stored readings by pressing “HLD/REC” for 2 seconds. REC icon
is flashing while reviewing data (Fig. 2). Press “MODE” or “MEM” to
scroll through the memory counter. Or press “MNX/AV” to view Minimum,
Maximum, and Average reading of stored data. Press “HLD/REC” again for
2 seconds to exit data recall mode.

11. Rinse the probe head with normal tap water after each measurement.

Fig. 2Fig. 1

Auto power off

The meter turns off automatically after 40 minutes inactivity to save battery
life. Users can set up desired time intervals (20, 30, 40, 60, 90, 120 minutes)
for the sleep function in SETUP P5.0. To override the auto power off function,
hold down “POWER/SET” and “HLD/REC” simultaneously to turn on the meter.
It shows “nSL” on the screen and then enters measuring mode in non-sleep
status.

4

Setup

The advanced setup mode lets you customize your meter.
9 parameters are available in this model.

P1.0: Clear memory
P2.0: Select Units
P3.0: Coefficient settings
P4.0: Ready indication
P5.0: Auto power off time
P6.0: Real time clock
P7.0: Beta (membrane temperature coefficient)
P8.0: View Calibration data
P9.0: Reset

To enter SETUP mode, hold down “POWER/SET” for some seconds to turn
on the meter. Press “MODE” or “MEM” to select parameters and press
“MNX/AV/ENTER” (indicates “ENTER” in the following instructions) for
parameter settings. To exit any setting, press CAL/Esc.

Note: P0.0 Print function is not available in this model.

P1.0: Clear memory

In P1.0, press “ENTER” go into P1.1. Select "n"-NO or "y"-YES with
“MODE” or “MEM” (Fig. 3), then press “ENTER” to confirm to clear all
memories or not.

P2.0: Select Units

In P2.0, press “ENTER” to go into P2.1. Select temperature unit °F or °C with
“MODE” or “MEM” and then press “ENTER” to P2.2 for selecting DO
unit in mg/l or ppm. Press “ENTER” again to confirm the unit selection and
return to P2.0.

Fig. 3

5

P3.0: Coefcient settings

In P3.0, press “ENTER” to go into P3.1 for changing barometric value in mmHg
(default 760mmHg, see Fig. 4). Press “MODE” to increase and “MEM” to
decrease the value. Press “ENTER” to P3.2 to change barometric value in kPA
(default 101.3kPA) and P3.3 to change salinity value (default 0.0ppt). Press
“ENTER” again to confirm the settings and go back to P3.0. (Check pressure in
different altitude. See appendix)

P4.0: Ready indication

Press “ENTER” to go into P4.1 and press “MODE” or “MEM” to switch
Ready indicator ON or OFF. (Fig. 5)

P5.0: Auto power off time

Press “ENTER” to go into P5.1, and select auto power off time with “MODE”
or “MEM”. The options are 20, 30, 40, 60, 90,120 minutes. Press “ENTER” to
complete the setting.

P6.0: Real time clock

In P6.0, press “ENTER” to go through P6.1 to P6.6 for date and time settings.
Y-M-D and H:M:S will show in turn and corresponding digits will be flashing
for further change. Press “MODE” to increase and “MEM” to decrease the
numbers and press “ENTER” to confirm every setting.

P7.0: Beta (membrane temperature coefcient)

In P7.0, press “ENTER” to go into P7.1 and it displays default Beta temperature
coefficient of the membrane 4.8 on the screen (Fig. 6). If different membrane
is used, change the correct value with “MODE” or “MEM” and press
“ENTER” to confirm the setting.

P8.0: View Calibration data

Press “ENTER” to go into P8.1. The LCD displays the latest calibration data
Slope (sensor sensitivity) and time. Enter P8.2 to view calibration temperature.

P9.0: Reset

Press “ENTER” to go into P9.1. Select "n"-No or "y"-Yes with “MODE” or
“MEM” for data reset to factory default. Press “ENTER” to confirm selection.

Fig. 4

Fig. 5

Fig. 6

6

Calibration Mode

It is required to perform 100% air saturation calibration before every
measurement. Check the stable reading in 15 mins after power on. If it

exceeds 100%+/-0.5% range, please performthe calibration in the followings:

1. Place the probe in the air and turn on the meter.

2. When DO reading is stable, press CAL/Esc to enter calibration mode. CAL
icon will be flashing on the left side of LCD during calibration. (Fig. 7)

3. Wait for about 5 seconds or until the reading is stable, press “ENTER” to
complete the calibration. Or terminate the calibration by pressing “CAL/Esc”.

4. If it is calibrated correctly, the meter will read approximately 100%. If the
calibration is failed, “ERR#” is displayed on the screen. Repeat the calibration.

USB Interface Capabilities

The USB cable and software (optional kit) are required to transfer data to a PC.
Install the USB driver in the software first before connection. And the connecting
protocol is 9600 bps, 8 data bits, no parity.

7

SPECIFICATION

D.O.%
Range 0.0~199.9%
Resolution 0.1%
Accuracy ±1.5% of F.S.

D.O.ppm
Range 0.00~19.99ppm
Resolution 0.01ppm
Accuracy ±1.5% of F.S.

Temperature
Range 0~50 °C / 32~122°F
Resolution 0.1°C
Accuracy ±0.5°C

Salinity
Range 0.0~50.0ppt
Resolution 0.1ppt

Pressure
Range 500~1499mmHg/66.6~199.9kPA
Resolution 1mmHg/0.1kPA
Memory point 99 point
Power supply 4pcs AAA batteries

EMC: Conforms to EN61326-1. This product complies with requirements of the

following EuropeanCommunity Directives: 89/ 336/ EEC (Electromagnetic Compatibility)
and 73/ 23/EEC (Low Voltage) as amended by 93/ 68/ EEC (CE Marking). However,
electricalnoise or intense electromagnetic fields in the vicinity of the equipment
maydisturb the measurement circuit. Measuring instruments will also respond
tounwanted signals that may be present within the measurement circuit. Usersshould
exercise care and take appropriate precautions to avoid misleading results when making
measurements in the presence of electronic interference.

8

MAINTENANCE AND REPAIR

If there appears to be a malfunction during the operation of the meter, the
following steps should be performed in order to isolate the cause of the
problem.

1. Check the battery. Replace the battery immediately when the symbol
“

” appears on the LCD.

2. Review the operating instructions for possible mistakes in operating
procedure.

Except for the replacement of the battery, repair of the meter should be
performed only by a Factory Authorized Service Center or by other qualified
instrument service personnel. The front panel and case can be cleaned with
a mild solution of detergent and water. Apply sparingly with a soft cloth and
allow to dry completely before using. Do not use aromatic hydrocarbons,
Gasoline or chlorinated solvents for cleaning.

To Replace Membrane

Follow the steps below to replace a new membrane when the meter cannot be
calibrated or the membrane is damaged.

1. Prepare a new membrane.

2. Unscrew the probe guard.

3. Remove the membrane from the membrane lock cap.

4. Remove the O-ring and membrane lock ring.

5. Rinse the membrane cap and lock ring in the tap water.

6. Install a new O-ring.

7. Install a new membrane.

8. Cover with the membrane lock ring and lock cap. Reattach the probe guard
and complete membrane replacement.

9

To replace electrolyte solution

Replace the electrolyte solution when bubbles are seen around the sensor
or membrane, meter appears to be less sensitive, or when an error message
indicates that measurements are inaccurate.

1. Remove the screw nut, washer, and o-ring from the filler port with a screw driver.

2. Flush out the current electrolyte solution.

3. Rinse the electrode by injecting distilled or de-ionized water into the filler
port. Gently shake the probe and flush out the water.

4. Use a syringe to refill the probe with electrolyte (KBr) solution from the
sprue on the probe. Refill slowly to ensure no bubble in the probe.

5. Reinstall the o-ring, washer and screw.

TROUBLESHOOTING

Can't power on

• Make sure you have connected the electrode to the meter, and the electrode

polarization time over 10 minutes.

• Check the membrane to see if air is trapped under the membrane.

• Make sure you press power key more than > 0.3 Second.

• Check the battery conditions and replace if necessary.

• Move batteries away for one minute and then re-install.

10

Probe is not reading correctly

• Check the membrane and replace with new membrane if it is clogged by

something.

• Clean the cathode and anode if they are tarnished.

• Check for signicant concentration of H2S , SO2 , H2 , Neon and NO..because

some gases can interfere with DO readings.

Display disappears

Check whether the low battery indicator is displayed on before the display is
disappeared, if yes, replace with new batteries.

Error code
E 1: The probe is disconnected or damaged.
E 2: The value is underflow.
E 3: The value is overflow.
E 4: The original data that is related to this value error.
E17: 100% saturation Calibration error.
E21: The current temperature is out of +/- 10 C of the temperature when doing

100% saturation calibration. Perform 100% calibration again.

E31: A/D error.
E32: IIC memory error.

APPENDIX

Altitude/Pressure chart

Altitude (Meter/Ft.) Pressure (mmHg)
0 (Sea level ) 760

152 / 500 746
305 / 1000 732
457 / 1500 720
610 / 2000 707
762 / 2500
914 / 3000 681
1067 / 3500 668
1219 / 4000 656
1372 / 4500 644
1524 / 5000 632

1676 / 5500 621
1829 / 6000 609

694

11

MATERIAL SAFETY DATA SHEET OF ELECTROLYTE

SECTION I - IDENTITY INFORMATION

INGREDIENT: KBr
Chemical Name: potassium bromide; bromide salt of potassium
CAS No. : 7758-02-3
Manufacturer: Shanghai Guanghua Techonology Ltd.
http://www.e-chem.com.cn
Phone: [phone]
Email:[e-mail]
Date Prepared: 2004-01-01

SECTION II -PHYSICAL/CHEMICAL CHARACTERISTIC

Boiling Point: 1380 degree C / 2516˚F
Melting Point: 730 degree C / 1346˚F
Vapor Pressure: 0.13 kPa@795 degree C / 1463˚F
Water Solubility: Soluble
Appearance /Odor: white granules with a bitter, saline taste, odorless

SECTION III - HEALTH HAZARD DATA

Route Of Entry: Inhalation, Ingestion, and skin absorption

Health Hazards: Inhalation may cause respiratory tract irritation. Irritative

to eyes and skin. Harmful if swallowed. May cause headache, dizziness,
drowsiness, and nausea.

SECTION IV: EMERGENCY & FIRST AID MEASURES

Eyes: Immediately flush eyes with plenty of water for at least 15 minutes,
occasionally lift the upper and lower eyelids. Get medical aid.

Skin: Remove contaminated clothing and shoes. Flush skin with plenty of
water for at least 15 minutes Get medical aid.

Inhalation: Remove from exposure to fresh air immediately. If not breathing,
give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.

Ingestion: If swallowed, Do NOT induce vomiting. Wash out mouth with water
and give plenty of water to drink. Seek immediate medical attention.

Special Fire Fighting Procedures: Wear self-contained breathing apparatus and
protective clothing to prevent contact with skin and clothing.

Unusual Fire & Explosion Hazards: Emits toxic fumes under fire conditions.

12

SECTION V: FIRE FIGHTING MEASURES

Flash Point: Not flammable

Special Fire Fighting Procedures: Wear self-contained breathing apparatus and

protective clothing to prevent contact with skin and clothing.

Unusual Fire & Explosion Hazards: Emits toxic fumes under fire conditions.

SECTION VI - EXPOSURE CONTROLS, PERSONAL PROTECTION

Evacuate area. Wear respirator, protective clothing, chemical safety goggles,
rubber boots and gloves when handling. Sweep up but avoid raising dust.
Collect in a bag and hold for waste disposal. Ventilate the area and wash spill
site after materials pick up is compete.

SECTION VII - HANDLING AND STORAGE

Handling: Wear respirator, protective clothing, chemical safety goggles, rubber
boots and gloves when handling.

Ventilate the operation room. Do not get in eyes, on skin, on clothing. Wash
thoroughly after handling.

Storage: Store in a cool dry place. Away from fire or moisture.

SECTION VIII - REACTIVITY DATA

Stability: Stable

Hazardous Polymerization: Will not occur

Materials To Avoid: Strong oxidizers, acids, and bromine trifluoride

DISCLAIMER

The above information is transferred to this format by Amprobe from the
Material Safety Data Sheet supplied by the manufacturer identified in Section
I. If you have any questions related to the material provided herein, contact
the manufacturer directly at the phone number given in Section I. Amprobe
does not, in any way, represent itself as an expert in the chemical described in
this MSDS and assume in liability for any incomplete or inaccurate information
contained herein.

13