This Instruction Manual is also available for download on our Web-site: eutechinst.com or 4oakton.com 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. 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. INSTRUCTION MANUAL pHTestr 10, 20, 30, 10BNC, Spear Large Screen Waterproof pH / Temperature Tester Double Junction Note: All testers have dual display during calibration mode Note: To abort calibration, press the `CAL' button. 4. Allow about 2 minutes for the tester 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 be toggling in between readings of the next pH standard buffer solution. 5. Repeat with other buffers if necessary. Rinse electrode in tap water before dipping into next buffer. Figure 4: Example of HOLD Function User Reset Introduction Thank you for selecting our microprocessor waterproof pH tester with USA or NIST buffer set selection. You have one of five models: · pHTestr10 · pHTestr20 · pHTestr30 · pHTestr10BNC · pHSpear This manual provides a step-by-step guide to operate the testers. 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. Before you begin: You can reset the pH calibration to the factory default by using the user reset function. Buffer set selection and temperature user calibration (pHTestr30) are not affected by the user reset function. 1. Switch off the tester. 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 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. Condition your pHTestr 10, 20, 30 electrodes by immersing it in electrode storage solution or 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 tap water via its protective cap. Note: For pHTestr10BNC, please refer to the pH electrode's instruction manual. pH Buffer Set Selection Your tester 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 tester 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 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 lits up and goes back to measureme nt mode. 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 5: User Reset Sequence Figure 2: Example of pH Calibration Sequence Automatic Temperature Compensation (ATC) ATC feature is available only in pHTestr 10, pH Testr 20 and pH Testr 30. Through its inbuilt 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. pH Testr10BNC and pH Spear has no ATC function and therefore the error should be calculated to derive the actual pH reading of the sample. For these testers, the impact on temperature compensation is 0.003 pH /°C / pH away from pH 7. For example, if pHSpear is calibrated at room temperature (25 °C) and is measuring sample around pH 4 at around 5 °C. Temperature difference : 25°C - 5°C = 20 °C pH away from neutral : 7pH - 4pH = 3 pH Total error : 0.003 x 20 x 3 = 0.18 pH This error value of 0.18 pH should be taken into consideration to derive the actual pH reading of the sample. pH Measurement Figure 1: Buffer Selection Sequence 1. Press the ON/OFF button to switch the tester on. 2. Dip the electrode about 2 to 3 cm into the test solution. Stir and let the reading stabilize. For pHSpear, pierce the penetrating tip electrode through your semi solid sample as per the desired depth. Rotate left and right several times and tilt to ensure sample contact. 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 tester. If you do not press a button for 8.5 minutes, the tester will automatically shut off to conserve batteries. Temperature Calibration (Only for pHTestr 30) From the measurement mode, 1. Press the HOLD/ENT button to bring the tester to the `HOLD' mode. 2. Press the CAL button for 3 seconds to switch to the °C or °F mode setting selection screen. Pressing the CAL button continuously for 3 seconds allows you to toggle in between the °C and °F mode setting selection screen. 3. Release the CAL button to confirm your mode selection and the display will go to the temperature calibration mode with the upper display flashing. The upper display shows the current measured temperature reading based on the last set offset and the lower 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 in built temperature sensor to stabilize. 5. Press the HOLD/ENT button to set the upper display to the temperature value of the solution. 6. Once the new temperature setting is reached, the new value is automatically confirmed and returns to the measurement mode if no button is pressed after 5 seconds. Changing Batteries 1. Open battery compartment lid (with attached lanyard loop). 2. Remove old batteries; replace with fresh ones. Note polarity Warranty Self-Diagnostic Messages Low battery indicator 3 Bars indicates Battery is full (100%) 2 Bars indicates 50% of the battery life is left 1 Bar indicates 25% of the battery life is left Blinking battery casing indicates the need to replace batteries with fresh ones as specified by manufacturer Electrode is not in contact with solution or electrode is failing. Replacement sensor is not connected properly to the tester during sensor replacement Measured pH value or temperature value (pHTestr30) exceeds its specified maximum or minimum value Blinking `ATC', `Or' or `Ur' indicates that there is a short or open circuit at the built in temperature sensor Temperature calibration error of attempting to calibrate tester to a value which is out of range or under range pH calibration error of attempting to confirm a calibration value which is not within the specified calibration window The waterproof pHTestr10, pHTestr20, pHTestr30, pHTestr10BNC and pHSpear are warranted to be free from manufacturing defects for 2 years and electrode module for 6 months. If repair, adjustment or replacement is necessary and has not been the result of abuse or misuse within the time period, please return the tester ­ freight prepaid ­ and correction will be made without charge. Out of warranty products will be repaired on a charge basis. Return of Items Authorization must be obtained from your distributor before returning items for any reason. When applying for authorization, please include information regarding the reason the item(s) are to be returned. Note: We reserve the right to make improvements in design, construction and appearance of products without notice. Prices are subject to change without notice. Or / Ur (Still) Accessories Item pHTestr 10,20,30 replacement sensor pHTestr10BNC replacement sensor pHSpear replacement sensor Eutech Instruments Order Code ECPHWPSEN03 ECPHWPSENBNC ECPHWPSEN04 Oakton Instruments Order Code OKPHWPSEN03 OKPHWPSENBNC OKPHWPSEN04 Notes: To exit this program without confirming the calibration, press the CAL button before the automatic confirmation takes place. Continuous pressing of CAL button (about 3 seconds) to toggle between temperature setting of degrees Celsius and Farenheit Over range / Under range signal Error Message ATC / Or / Ur (Blinking) r. E r. 0 r. E r. 1 Specifications Large Screen Testers pH Range Resolution Relative Accuracy Calibration Points Buffer Set Standard Selection Calibration Window (USA Buffer Set Standard) Calibration Window (NIST Buffer Set Standard) Temperature Display Automatic Temperature Compensation (ATC) Temp Resolution No No No Temp Accuracy Temp Calibration Window Auto Off User reset Non Volatile Memory Backup LCD Display Power Requirement Battery life Operating Temperature Tester Dimensions pHTestr10 -1.0 to 15.0 pH 0.1 pH 0.1 pH Up to 3 points USA - 4.0/7.0/10.0 NIST - 4.0/6.9/9.2 +/-1.0 pH (pH 4.0 & pH 10.0), +/-1.5 pH (pH 7.0) +/-1.0 pH (pH 4.0 & pH 9.2), +/-1.2 pH (pH 6.9) No pHTestr20 pHTestr30 0.01 pH 0.01 pH pHTestr 10BNC pHSpear -1.00 to 15.00 pH During calibration, upper display will flash. Press HOLD/ENT to increase offset up to +5 °C (+9 °F) from default value. It will roll over to -5 °C (-9 °F) from default value and start increasing again. When the temperature offset value is reached, the new value is automatically confirmed if no key is pressed for 5 seconds. Release CAL button to start entering the new temperature Electrode Replacement You can replace the electrode module at the fraction of the cost of a new tester. When the tester fails to calibrate or gives fluctuating readings in calibration standards, you need to change the electrode. 1. With dry hands, grip the ribbed tester collar with electrode facing you. Twist the collar counter clockwise (see picture A). Save the ribbed tester collar and O-ring for later use. 2. Pull the old electrode module away from the tester. 3. Align the four tabs on the new module so that they match the four slots on the tester (see picture B). 4. Gently push the module onto the slots to sit it in position. Push the smaller O-ring fully onto the new electrode module. Push the collar over the module and thread it into place by firmly twisting clockwise. Up to 3 points USA - 4.01/7.00/10.01 NIST - 4.01/6.86/9.18 +/-1.00 pH (pH 4.01 & pH 10.01), +/-1.50 pH (pH 7.00) +/-1.00 pH (pH 4.01 & pH 9.18), +/-1.25 pH (pH 6.86) 0-50.0°C or 32.0-122.0°F Yes 0.1 °C / °F 0.5 °C / 0.9 °F +/- (5°C /9 °F) from default value After 8.5 minutes from last key press Yes Yes Dual 4 x 1.5V "A 76" micro Alkaline Batteries More than 500 hrs 0 ­ 50 °C 6.5 "L x 1.5"dia. (165 x 38 mm) No No ( Fix Temp Compensation at 25°C) No No No Figure 6: Temperature Calibration Sequence ( Only for pHTestr 30DJ) Note: It is necessary that you recalibrate your tester prior to measurement after an electrode replacement. Rotate collar away from you Insert Electrode Module Electrode Module Large O-ring Electrode Maintenance 1. Rinse the electrode with tap water or electrode storage solution after each ...