Kensington KS-DO-10 User manual

User Manual
KS-DO-10 |Pocket Dissolved Oxygen Tester
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
OVERVIEW
Below are the steps you need to follow to begin using your Kensington KS-DO-10 pocket dissolved oxygen tester. This
manual will cover how insert the batteries, using the function keys, making measurements, and sensor replacement.
PACKAGE CONTENTS
1. Dissolved Oxygen Probe
2. DO Electrolyte solution
3. AAA batteries
4. DO Membrane Cap
INSERTING THE BATTERIES
1. Your Kensington Pocket KS-DO-10 pocket salinity tester uses two AAA batteries.
2. Remove the button cap found on the bottom of the tester as shown in the above image.
3. Place the battery into its designated slot. Take note of the proper position of the battery to ensure the polarities
placed correctly.
4. Replace the battery cap.
KEYPAD INDEX
Key
Function
1. Serves as the power button of the tester
2. Initiates Data Hold. Press once to hold the current reading, press again to resume making
measurements.
3. Exit button during calibration
1. Press once to conduct calibration of the instrument
2. Press and hold to enter setup menu
3. In calibration mode, press to set calibration values.

User Manual
KS-DO-10 |Pocket Dissolved Oxygen Tester
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
4. In setup mode, press to select default option
1. Press to confirm calibration or chosen option
2. Toggles between conductivity, TDS and salinity measurement modes.
DISPLAY
The KS-SAL-20 is built with a clear LCD display that shows the measured value, various mode indicators and units.
Below is a summary to describe the meaning behind each notification on the display.
Indicator
Description
MEAS
Indicates tester is in the measurement mode
CAL
Indicates tester is in calibration mode
SETUP
Indicates tester is in SETUP mode
HOLD
Indicates the HOLD function is active and the current displayed value is on hold.
ATC
Indicates temperature compensation is enabled
REFILLING ELECTROLYTE SOLUTION FOR DO PROBE
1. Remove the packaging of the DO probe. Unscrew its cap from the probe as shown from the image below:
2. Fill the membrane cap halfway with the electrolyte solution
3. Screw back the membrane cap on the probe.
4. Make sure the cathode of the probe makes contact with the membrane cap. Make sure there are no bubbles found
on the electrolyte solution.

User Manual
KS-DO-10 |Pocket Dissolved Oxygen Tester
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
SETUP MENU
The KS-SAL-20 contains integrated setup menu that allows you to customize your tester’s features to fit your
measurement requirements.
Parameter
Description
Options
Description
SALT
Salinity Coefficient
0.0 (Default)
Setting range: 0 to 35 ppt
PRES
Atmospheric Pressure
Coefficient
760 (Default)
Setting range: 450 to 850
mmHg
CAL
Calibration Points
1 (Default)
1 point calibration
2
2 points calibration
UNIT
Measurement Unit
mg/L (Default)
Concentration unit
ppm
Concentration unit
%
% saturation
°C (Default)
Celsius
°F
Fahrenheit
°C
Temperature calibration
CAL
Temperature calibration
mode
HOLD
Auto-Hold
YES
Automatically freezes
stable readings
NO (Default)
Disable
OFF
Auto-off
YES (Default)
Automatically turns off
tester after 8 seconds of
idle
NO
Disable
RST
Reset
YES
Restores factory settings
NO (Default)
Disable
SETTING OF DEFAULT PARAMETERS
1. Press the CAL button to enter setup menu. The first display should be the current salinity coefficient.
2. Press CAL again to set the desired value. Press ENTER to confirm.
3. The tester should then display the atmospheric pressure setting. The display should show ‘760mmHg’.

User Manual
KS-DO-10 |Pocket Dissolved Oxygen Tester
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
4. Press CAL again to set the desired value. Press ENTER to confirm.
5. The tester will then proceed to calibration point setting. The display should display ‘1’ for 1 point calibration.
6. Press the CAL key again to change the default calibration point, selecting 1, 2 or 3 points. Press the ENTER key
to confirm.
3. The tester will now automatically display the measurement unit selection mode. The display should show ‘mg/L’ as
the default unit.
6. Press CAL to the select the chosen measurement unit you need (mg/L, ppm, °C or °F). Press ENTER to confirm.
7. The next display will show the temperature calibration mode. The display should show ‘°C/CAL’.
8. If you do not wish to conduct temperature calibration, press ENTER to proceed with the next option. If temperature
calibration is needed, press CAL key to begin calibration. The display should show the current temperature reading.
8. Press the CAL key to set the desired temperature value. Press ENTER to confirm.

User Manual
KS-DO-10 |Pocket Dissolved Oxygen Tester
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
9. The next setting is for the HOLD function. The display should show YES/HOLD indicating the auto hold function is
enabled.
10. If the automatic hold function is enabled, the tester will automatically freeze the stable measured value. If this
function is disabled, the user will have to press the HOLD key to enable the function when needed.
11. Press CAL key to enable or disable the HOLD function and press ENTER to confirm.
12. The next display should show ‘YES/OFF’ to show that auto off function is enabled.
13. Press the CAL key to disable this feature and press ENTER to confirm.
14. The final setting is for the Reset function. The display should show NO/RST
15. Press the CAL key to enable or disable the function and press ENTER to confirm. Remember that enabling this
functions will restore the tester to factory default setting and erase all selected parameters.
16. The tester will automatically go to measurement mode.
DO CALIBRATION IN % SATURATION MODE
The KS-DO-10 pocket dissolved oxygen tester can be calibrated quickly in air. In the percentage saturation mode, the
tester is able to perform either 1 or 2 points calibration. For 1 point calibration, it is recommended to perform 100%
saturation calibration without the use of a calibration solution. For 2 points calibration, a zero oxygen solution is
required.
100% SATURATION CALIBRATION
1.1 Make sure the calibration setting is at 1 point calibration.
1.2 Make sure the dissolved oxygen probe is connected to the tester properly. Turn on the meter for 10 to 15 minutes
to polarize the sensor.

User Manual
KS-DO-10 |Pocket Dissolved Oxygen Tester
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
1.3 Press the CAL key. The display should show ‘CAL1/100%’
1.4 Hole the DO probe in the air or submerge the probe into air-saturated water for 3 to 5 minutes. Press ENTER to
confirm. Wait for the value to stabilize and the display should show ‘END’. Single point calibration is completed.
TWO POINTS CALIBRATION
2.1 Make sure to select 2 points calibration in the settings. You will need a zero oxygen solution for this task.
2.2 Repeat steps 1.2 to 1.4. When the first point of calibration is done, the display should show ‘CAL2/0%’ and the
tester will automatically proceed with the second calibration point.
2.3 Submerge the probe in the zero oxygen solution, stir the sensor greatly.
2.4 Press ENTER to confirm. Wait for the reading to stabilize (this can take up to 10 minutes). The display should then
show ‘END’ and the tester returns to measurement mode automatically to end the calibration process.
TEMPERATURE CALIBRATION
The temperature is displayed together with the measurement for oxygen saturation. Temperature calibration is needed
to ensure that displayed temperature is accurate.
1. To begin, press the CAL key to enter setup menu.
2. Press ENTER until the display shows ‘°C/CAL’
3. Press the CAL key to enter the temperature calibration mode.
4. Use the CAL key to set the temperature value

User Manual
KS-DO-10 |Pocket Dissolved Oxygen Tester
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
5. Press the ENTER key to confirm and Press MEAS to exit calibration mode.
MAKING DISSOLVE OXYGEN MEASUREMENTS
The KS-DO-10 is suitable for measuring the water, waste water, brine and other liquids. If the tester will be used to
measure liquids with high salinity such as sea water, remember to set the salinity coefficient setting before use.
Do note that the presence of certain gasses in the tested liquid such as chloride ammonium and carbon dioxide can
affect your DO measurement.
Samples that contains solvent, grease sulphide and others may damage or obstruct the membrane.
1. Press the MEAS/HOLD button to turn on the meter. Set the required unit, atmospheric pressure and salinity
coefficient in setup mode.
2. Remove the protective cap of the DO sensor
3. Submerge the probe up to its temperature sensor into the tested solution.
4. Wait for the measurement to stabilize and record the measurement.
HOLD FUNCTION
1. Pressing the HOLD key while in measurement mode will activate the hold function. The HOLD indicator will appear
on the display and further measurement readings will not be possible.
2. Press the HOLD key again to disable the hold function.
ELECTRODE SENSOR MAINTENANCE
1. It is recommended to keep the sensitive membrane of the sensor wet.
2. If the instrument will be kept in storage for a long time, rinse the probe’s cathode, anode and the membrane in
distilled water.
3. Use filter paper to strain the washed solution and replace the probe onto the tester.

User Manual
KS-DO-10 |Pocket Dissolved Oxygen Tester
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
SPECIFICATIONS
Dissolved Oxygen
Range
0.0~20.0mg/L (or ppm)
Accuracy
± 0.5mg/L
Resolution
0.1mg/L
% Saturation of
Oxygen
Range
0.0~200.0%
Accuracy
± 10% F.S
Resolution
0.1%
Others
Temperature compensation
0~60°C, 32~140°F
Barometric Pressure
correction
60.0~112.5kPa, 450~850mmHg
Salinity correction
0~35g/L
Reset function
Yes
Data hold
Manual or automatic
Power off
Manual or automatic
Power Requirements
2× 1.5V "AAA" Batteries
Dimensions
185(L)× 40(Dia.)mm