With meter
powered off, press
HOLD/ENT and
ON/OFF at the
same time. First
release ON/OFF
button, then
HOLD/ENT button.
After buffer
selection, whole
LCD segment
lights up and
goes back to
measurement
mode.
Figure 1: Buffer Selection Sequence
Figure 5: User Reset Sequence
With meter
powered off, press
CAL and ON/OFF at
the same time. First
release ON/OFF
button, then
CAL button.
After reset, whole
LCD segment lits
up and goes back to
measurement mode.
Before You Begin
Your instrument has been factory calibrated and usually works well out of
the box. However, after extended periods of non-use, it’s best to soak the
sensor in electrode storage solution, pH buffer for 10 minutes or so. A brief
rinse with deionized (DI) water is OK, but avoid soaking or storing in deionized
water as this will shorten the pH electrode life. Prior to taking measurements,
periodic calibration with certified standards is recommended for best accuracy.
pH Buffer Set Selection
pHTestr features USA (pH 4.01, pH 7.00 and pH 10.01) or NIST (pH 4.01,
pH 6.86, and pH 9.18) standards. Select either one to suit your requirements.
1. While pressing the HOLD/ENT button, switch on the unit by pressing the
ON/OFF button.
2. Release the HOLD/ENT button. The display will flash either USA or NIST.
3. Press CAL button to toggle between the two buffer set standards.
4. Press the HOLD/ENT button to confirm the selection of the buffer set.
pH Calibration
Calibration should be done regularly, preferably once a week. You can calibrate
up to three points using either the USA or the NIST buffer set standards.
1. Press ON/OFF button to switch unit on.
2. Dip electrode about 2 to 3 cm into the pH standard buffer solution.
3. Press the CAL button to enter calibration mode. The ‘CAL’ indicator will be
shown. The upper display will show the measured reading based on the last
calibration while the lower display will indicate the pH standard buffer solution.
Note: To abort calibration, press the CAL button.
4. Allow about 2 minutes for the reading to stabilize before pressing the
HOLD/ENT button to confirm the first calibration point. The upper display
will be calibrated to the pH standard buffer solution and the lower display
will then search for the next pH standard buffer solution.
5. Repeat with other buffers if necessary. Rinse electrode before dipping into
next buffer.
Note: The calibration mode allows you to perform up to three calibration points
before returning to the measurement mode automatically. However, if you opted
to have only one or two calibration points, simply skip the remaining calibration
points by exiting to the measurement mode by pressing the CAL button.
Operating Instructions
pHTestr
®
30 Pocket Tester
Large Screen
Waterproof pH/Temperature Tester
Double-Junction Sensor
To do a 1 point calibration
only, press CAL button at this
point to exit to the measurement
mode. Otherwise, proceed to
second buffer for a second
buffer for a second point
calibration.
To do a 2 point calibration only, press
CAL button at this point to exit to the
measurement mode. Otherwise,
proceed to third buffer for a third
buffer for a third point calibration.
After the third point calibration, the meter will
automatically return to the measurement mode.
At any point, an error message ‘Er. 1’ will be
displayed momentarily if the confirmed pH value
is not within the pH calibration window.
Figure 2: Example of pH Calibration Sequence
pH Measurement
1
. Press the ON/OFF button to switch the unit on.
2. Dip the electrode about 2 to 3 cm into the test solution. Stir and let the
reading stabilize. For semi-solid samples using pHSpear, rotation is ideal
for sample contact.
CAUTION: Testing dry samples is not accurate and can lead to sensor damage
or breakage. Soils must be wet and free of particulates that may scratch the
glass sensor. Excessive force into dry samples can cause glass breakage.
3. Note the pH value or press HOLD/ENT button to freeze the reading. To
release the reading, press HOLD/ENT again.
4. Press ON/OFF to turn off unit. If you do not press a button for 8.5 minutes,
the unit will automatically shut off to conserve batteries.
Figure 4: Example of HOLD Function
HOLD Function
This feature lets you freeze the display for a delayed observation.
1. Press HOLD/ENT button to freeze the measurement. A ‘HOLD’ indicator will
be displayed and the measurement will be frozen.
2. Press HOLD/ENT again to release the measurement. The ‘HOLD’ indicator
will not be displayed anymore indicating the held measurement is released.
ATC - Automatic Temperature Compensation
Through its built-in temperature sensor, the measurement error due to the
changes in electrode sensitivity due to changes in temperature is compensated
to give the actual pH reading of the sample measured.
Note: To exit this program without confirming the calibration, press the
CAL button before the automatic confirmation takes place.
• Aquaculture
• Aquariums
• Boilers
• Car washes
• Ecology studies
Applications
• Food sectors
• Hydroponices
• Labs
• Pools
• Sanitation plants
• Spas
• Steam generators
• Water & wastewater
treatment
•
Water quality testing
• More!
User Reset
You can reset the pH calibration to the factory default by using the user reset
function. Buffer set selection and temperature user calibration are not affected
by the user reset function.
1. Switch off the unit.
2. While pressing the CAL button, press and release the ON/OFF button to
enter the ‘User Reset’ selection menu. The screen will display ‘rSt’ on the
bottom display with a flashing ‘nO’ selection.
3. Use the CAL button to toggle between ‘nO’ and ‘YES’ selection.
• nO deactivates reset selection
• YES activates the reset selection
4. Press the HOLD/ENT button to confirm the selection made.
5. If you have selected ‘YES’, the unit will show ‘CO’ momentarily and proceed
to the measurement mode with the calibration reset back to factory default
value.
6. If ‘nO’ is selected, the unit will proceed to the measurement mode without
any calibration reset performed.
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