Oakton pHTestr 20 Instruction Manual

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INSTRUCTION MANUALpHTestr 10, 20, 30, 10BNC, SpearLarge ScreenWaterproof pH / Temperature TestrDouble JunctionIntroductionThank you for selecting our waterproof pH Testr. This manual serves the following(5) models:• pHTestr 10 (Eutech PHTEST10 / 01X366901 / Oakton 35634-10)• pHTestr 20 (Eutech PHTEST20 / 01X366902 / Oakton 35634-20)• pHTestr 30 (Eutech PHTEST30 / 01X366903 / Oakton 35634-30)• pHTestr 10BNC (Eutech PHTEST10BNC 01X366904 / Oakton 35634-14)• pH Spear (Eutech PPHSPEAR 01X366920 / Oakton 35634-40)This manual provides a step-by-step guide to operate the Testrs.Before you begin:Condition your pHTestr 10, 20, 30 electrodes by immersing it in electrode storage solutionor tap water for at least 30 minutes before use. DO NOT use de-ionized water.Ensure that your pHSpear electrode is always soaked in the electrode storage solution or tapwater via its protective cap.Note: For pHTestr10BNC, please refer to the pH electrode’s instruction manual.pH Buffer Set SelectionYour Testr features USA (pH 4.01, pH 7.00 and pH 10.01) or NIST (pH 4.01, pH 6.86, andpH 9.18) standards. Select either one to suit your requirements.1. While pressing the HOLD/ENT button, switch on the Testr by pressing theON/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.This Instruction Manual is also available for download on our Web-site: eutechinst.com or 4oakton.comFigure 5: User Reset SequenceWith meter poweredoff, press CAL andON/OFF at the sametime. First releaseON/OFF button, thenCAL button.After reset, wholeLCD segment lits upand goes back tomeasurement mode.Figure 4: Example of HOLD Function3. Press the CAL button to enter calibration mode. The ‘CAL’ indicator will beshown. The upper display will show the measured reading based on the lastcalibration while the lower display will indicate the pH standard buffer solution.Note: All Testrs have dual display during calibration modeNote: To abort calibration, press the ‘CAL’ button.4. Allow about 2 minutes for the Testr reading to stabilize before pressingthe HOLD/ENT button to confirm the first calibration point. The upper display willbe calibrated to the pH standard buffer solution and the lower display will thenbe toggling in between readings of the next pH standard buffer solution.5. Repeat with other buffers if necessary. Rinse electrode in tap water beforedipping into next buffer.Note: The calibration mode allows you to perform up to three calibration points before returningto the measurement mode automatically. However, if you opted to have only one or twocalibration points, simply skip the remaining calibration points by exiting to the measurementmode by pressing the CAL button.pH Measurement1. Press the ON/OFF button to switch the Testr on.2. Dip the electrode about 2 to 3 cm into the test solution. Stir and let the readingstabilize. For semi-solid samples using pHSpear, rotation is ideal for sample contact.CAUTION: Testing dry samples is not accurate and can lead to sensor damageor breakage. Soils must be wet and free of par ticulates that may scratch the glasssensor. Excessive force into dry samples can cause glass breakage.3. Note the pH value or press HOLD/ENT button to freeze the reading. To releasethe reading, press HOLD/ENT again.4. Press ON/OFF to turn off Testr. If you do not press a button for 8.5 minutes,the Testr will automatically shut off to conserve batteries.HOLD FunctionThis feature lets you freeze the display for a delayed observation1. Press HOLD/ENT button to freeze the measurement. A ‘HOLD’ indicator will bedisplayed and the measurement will be frozen.2. Press HOLD/ENT again to release the measurement. The ‘HOLD’ indicator willnot be displayed anymore indicating the held measurement is released.With meter poweredoff, pressHOLD/ENTand ON/OFFat the sametime. First releaseON/OFF button, thenHOLD/ENT button.After bufferselection,whole LCDsegment lits upand goes backto measurement mode.Figure 1: Buffer Selection SequenceTo do a 1 point calibrationonly, press CAL button at thispoint to exit to themeasurement mode.Otherwise, proceed to secondbuffer for a second buffer fora second point calibration.To do a 2 point calibration only, pressCAL button at this point to exit to themeasurement mode. Otherwise,proceed to third buffer for a thirdbuffer for a third point calibration.After the third point calibration, the meter willautomatically return to the measurementmode. At any point, an error message ‘Er. 1’will be displayed momentarily if the confirmedpH value is not within the pH calibrationwindow.Figure 2: Example of pH Calibration SequenceATC - Automatic Temperature Compensation(Only for pHTestr 10, pHTestr 20 and pHTestr 30)Through its in-built temperature sensor, the measurement error due to the changes in electrodesensitivity due to changes in temperature is compensated to give the actual pH reading ofthe sample measured.MTC - Manual Temperature Compensation(Only for pHTestr 10BNC, pH Spear)The MTC range is 0 to 50.0 °C (32.0 to122.0 °F). User reset will set temperature to defaultvalue 25°C or 77°F.While in the measurement mode,1. Press the HOLD/ENT button to bring the Testr to the ‘HOLD’ mode.2. Press the CAL button continuously to switch to the °C or °F mode settingselection screen.3. Release the CAL button to confirm your mode selection and the display will go tothe manual temperature calibration mode with the upper display flashing. Theupper display shows the adjustable temperature value and the lower display showsthe last set temperature offset.4. Press the HOLD/ENT button to set the upper display to the temperature value ofyour sample.5. Once the setting is reached, release the HOLD/ENT button. The new value isautomatically confirmed and returns to the measurement mode if no button ispressed after 5 seconds.Notes: To exit this program without confirming the calibration, press the CAL button beforethe automatic confirmation takes place.pH CalibrationCalibration should be done regularly, preferably once a week. You can calibrate up to threepoints 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.User ResetYou can reset the pH calibration to the factory default by using the user reset function. Bufferset selection and temperature user calibration (pHTestr30) are not affected by the userreset function.1. Switch off the Testr.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 witha flashing ‘nO’ selection.3. Use the ‘CAL’ button to toggle between ‘nO’ and ‘YES’ selection.• nO deactivates reset selection• YES activates the reset selection4. 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 themeasurement mode with the calibration reset back to factory default value.6. If ‘nO’ is selected, the unit will proceed to the measurement mode without anycalibration reset performed.Part of Thermo Fisher Scientific

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