Oakton pHTestr 50 Operating Instructions

Operating Instructions
pHTestr 50 and 50S Pocket Testers
®

Applications

• Aquaculture • Food sectors • Spas
• Aquariums • Studies
• Hydroponics
• Boilers • Labs • Water and wastewater
• Car washes
• Sanitation plants
• Ecology • Steam generators • Water quality testing

Getting Started

The pH tester has been factory calibrated and usually works well out of the
box. However, after extended periods of non-use, it is best to ensure that the
sensor is hydrated. Fill the cap with electrode storage solution or pH buffer
and soak the sensor as needed to get a stable pH reading. A brief rinse with
deionized (DI) water is OK, but avoid soaking or storing in deionized water as
this will shorten pH electrode life. Prior to taking the measurements, periodic
calibration with certified standards is recommended for best accuracy.

Buffer Set Selection

Select either USA (pH 4.01, pH 7.00 and pH 10.01) or NIST (pH 4.01, pH 6.86,
and pH 9.18) to match your calibration standard values.
1. Press ON/OFF ( ) to power on.
v
2. Press MENU/ to enter setup window. Press HOLD/ to select Settings.
The display shows Buffer and Backlight.
3. Press HOLD/ to select Buffer. The display shows USA and NIST.
4. Press HOLD/ to select USA or scroll down by pressing MENU/
between the two buffer standards.
5. The display shows the selected buffer with a
Key Info
menu hold hold
Scroll MENU Settings
Buffer
Temp Set
Accept
HOLD
Backlight
Reset
EXIT CAL

Backlight Settings

v
1. Press MENU/ to enter setup window. Press HOLD/ to select Settings.
The display shows Buffer and Backlight.
v
2. Scroll down by pressing MENU/ to toggle between Buffer and Backlight.
Press HOLD/ to select Backlight. The display shows ON and OFF.
v
3. Scroll down by pressing MENU/ to toggle between ON and OFF.
Backlight ON increases readability in low-light conditions.
4. Press HOLD/ to select the desired backlight option. The display shows
the selected backlight option with a .
Key Info
hold
hold
menu
Settings
Buffer Backlight
Scroll MENU
Temp Set
ON
Accept HOLD Backlight
OFF
Reset
EXIT CAL
1065O100_35634-15,-25.indd 1

Temperature Settings

v
1. Press MENU/ to enter setup window. Scroll down by pressing MENU/
to select Temp Set. Press HOLD/ to select Temp Set. The display shows
Set °C/°F and Temp Cal.
2. Press HOLD/ to select Set °C/°F. Display automatically shows °C and °F.
3. Scroll down by pressing MENU/
4. Press HOLD/ to select the desired temperature unit.
Key Info
menu
Scroll MENU
Accept HOLD
EXIT
CAL

Temperature Calibration

treatment
v
1. Press MENU/ to enter setup window. Scroll down by pressing MENU/
to highlight Temp Set. Press HOLD/ to select Temp Set. The display
in pools and more
shows Set °C/°F and Temp Cal.
2. Scroll down by pressing MENU/
Cal. Press HOLD/ to select Temp Cal.
3. The lower display shows the current measured temperature reading based
on the last set offset and the upper display shows the current measured
temperature reading based on factory default calibration.
4. Dip the tester into a solution of known temperature and allow time for the
temperature sensor to stabilize.
v
5. Press MENU/ to adjust the temperature value, then press HOLD/ to
confirm the new temperature value of the solution.
Note: To exit this program without confirming the calibration, press CAL/ESC.
Key Info
menu
Scroll MENU
Accept HOLD
EXIT CAL

pH Calibration

v Calibration should be done regularly, preferably once a week or more if using
to toggle
the tester daily. You can calibrate up to three points using standards from
either the USA or the NIST buffer groups. For best results, use a
. minimum of two pH buffers such as pH 4 and pH 7.
1. Press ON/OFF ( ) to power the tester on if needed.
hold
USA
USA 2. Dip sensor in about 2 cm to 3 cm into the pH standard buffer solution.
NIST
If using the supplied cap, fill to the "MAX" line. For best results, allow
the reading to stabilize if needed before proceeding.
3. Press the CAL/ESC key to enter calibration mode. The CAL indicator will be
displayed. The upper display will show the unadjusted factory default read-
ing while the lower display will search for the corresponding value from the
selected buffer group.
Note: All testers have dual display during calibration mode. To abort
calibration, press CAL/ESC.
4. The timer icon will blink while the reading stabilizes (allow 1 to 2 minutes).
Once the reading is stabilized, the timer stops blinking. The tester will auto-
matically confirm the calibration value and return to the measurement win-
dow when successful.
5. Rinse electrode and repeat with other buffers if necessary.
hold
OFF
v
v
to toggle between °C and °F.
hold hold hold
Settings
Set °C/°F °C
°C
Temp Set
Temp Cal
°F
Reset
v
v
to toggle between Set °C/°F and Temp
hold hold hold
Settings
Temp Cal
Set °C/°F 23.4°C
23.4 °C
Temp Set
Temp Cal 23.4 °C
Reset
CAL
CAL
cal
esc
Place the tester in pH
the buffer to start or
7.45
press to
cal
7.01
esc
escape.
°
25.0 C

Measurement

1. Press ON/OFF ( ) to power the tester on if needed.
2. Dip the sensor in about 2 cm to 3 cm into the sample. If using the supplied
cap, fill to the "MAX" line. Stir and let the reading stabilize. The timer icon
will blink during this time. Once the reading is stable,
CAUTION: Testing dry samples is not recommended and
can lead to sensor damage. Soils must be wet and free from
particulates that may scratch the glass sensor. Excessive
force into dry samples can cause glass breakage.
3. Note the pH value or press HOLD/ to freeze the reading.
To release the reading, press HOLD/ again.
4. Press ON/OFF ( ) for 3 seconds to turn off tester. If you do not press a button
for 8.5 minutes, the tester will automatically shut off to conserve batteries.

User Reset

Reset to the user's default settings by using the User Reset function. Buffer
selection and temperature user calibration are not affected by the User Reset
function.
v
1. Press MENU/ to enter setup window. Scroll down by pressing MENU/
select Reset. Press HOLD/ to select Reset. The display shows User Reset
and Factory Reset.
2. Press HOLD/ to select User Reset. The display automatically shows
No and Yes.
v
3. Scroll down by pressing MENU/ to toggle between No and Yes.
4. Press HOLD/ to confirm either No or Yes. The display shows the
User Reset option with a .
Key Info
hold
menu hold
Settings
Scroll MENU User Reset
No
Temp Set
Accept HOLD

Factory Reset

Yes
Reset
EXIT CAL
Factory Reset
Reset the pH calibration to the factory reset default by using the Factory Reset
function.
v
1. Press MENU/ to enter setup window. Scroll down by pressing the
v
MENU/ to select Reset. Press HOLD/ to select Reset. The display shows
User Reset and Factory Reset.
v
2. Scroll down by pressing the MENU/ to toggle between the resets. Press
HOLD/ to select Factory Reset. The display automatically shows No and Yes.
v
3. Scroll down by pressing MENU/ to toggle between No and Yes.
4. Press HOLD/ to confirm either No or Yes. The display shows the Factory
Reset option with a .
Key Info
hold
menu hold
Settings
User Reset
Scroll MENU
Temp Set
Accept HOLD Factory Reset
Reset
EXIT CAL
pH
pH
7.01
25.5°C
will appear.
pH
pH
4.01
25.5°C
v
to
hold
hold
No
Yes
9/5/2017 3:01:06 PM