Operating Instructions
pHTestr® 30 Pocket Tester
Large Screen
Waterproof pH/Temperature Tester
Double-Junction Sensor
Applications
• Aquaculture |
• Food sectors |
• Spas |
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• Aquariums |
• Hydroponices |
• Steam generators |
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• Boilers |
• Labs |
• Water & wastewater |
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• Car washes |
• Pools |
treatment |
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• Water quality testing |
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• Ecology studies |
• Sanitation plants |
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• More! |
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.
With meter |
After buffer |
powered off, press |
selection, whole |
HOLD/ENT and |
LCD segment |
ON/OFF at the |
lights up and |
same time. First |
goes back to |
release ON/OFF |
measurement |
button, then |
mode. |
HOLD/ENT button. |
Figure 1: Buffer Selection Sequence |
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.
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.
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.
Figure 4: Example of HOLD Function
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.
With meter |
After reset, whole |
powered off, press |
LCD segment lits |
CAL and ON/OFF at |
up and goes back to |
the same time. First |
measurement mode. |
release ON/OFF |
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button, then |
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CAL button. |
Figure 5: User Reset Sequence |
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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.
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8/25/2017 7:15:07 AM |
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