USER MANUAL AD11 & AD12 Waterproof pH Testers
Contents
1. in pH 7 01 or pH 6 86 buffer After the first calibration point has been accepted the pH 4 01 USE message appears The message is held for 12 seconds unless a valid buffer is recognized If no valid buffer is recognized then the WRNG message is shown If a valid buffer pH 4 01 10 01 or 9 18 is detected then the meter completes the calibration procedure The LCD shows the accepted value with the OK 2 message and then the meter returns to the normal mode Note When the calibration procedure is completed the CAL tag is turned on To quit calibration amp reset to default values e After entering the calibration mode and before the first point is accepted you can quit the procedure and return to the last calibration data by pressing the ON OFF MODE button The secondary LCD displays ESC for one second and then the meter returns to the normal measuring mode e To reset to the default calibration values press SET HOLD after entering the calibration mode and before the first point is accepted The secondary LCD displays CLR for one second the meter resets to the default calibration and the CAL tag disappears SETUP Setup mode allows the selection of temperature unit and pH buffer set To enter the setup mode press the ON OFF MODE button until CAL on the secondary display is replaced by TEMP and the current temperature unit e g TEMP C Then For C F selection e Use the SET HOLD2. USER MANUAL pre ADI amp AD12 Waterproof pH Testers pH Ca LOLS a AD 12 Ga pH meter ON OFF SET MODE HOLD www adwainstruments com ISTADI2 04 10 Dear Customer Thank you for choosing an Adwa product Please read carefully this manual before starting operations These instruments are in compliance with the EMC Directive 89 336 EEC and Low Voltage Directive 73 23 EEC for electrical equipments For additional technical information please e mail us at sales adwainstruments com INTRODUCTION AD11 and AD12 are waterproof pH and temperature testers The housing has been completely sealed against humidity All pH readings are automatically temperature compensated ATC and temperature values can be displayed in C or F units The meter can be calibrated at one or two points for pH with auto buffer recognition and against five memorized buffer values Measurements are highly accurate with a unique stability indicator right on the LCD The models are also provided with a low battery symbol which warns the user when the batteries need to be replaced The AD11P pH electrode supplied with the meter is interchangeable and can be easily replaced by the user The encapsulated temperature sensor allows fast and accurate temperature measurement and compensation Each meter is supplied complete with e ADII1P pH electrode e 4x 1 5V batteries button type e User
3. button After the temperature unit has been selected press the ON OFF MODE button to enter the buffer set selection mode e Press the ON OFF MODE button again to return to the normal measuring mode To change the calibration buffer set e After setting the temperature unit the meter will show the current buffer set pH 7 01 BUFF for 4 01 7 01 10 01 or pH 6 86 BUFF for NIST 4 01 6 86 9 18 e Change the set with the SET HOLD button then press ON OFF MODE to return to the normal measurement mode ELECTRODE MAINTENANCE When not in use rinse the electrode with water and store it with a few drops of A70300M storage solution in the protective cap NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER e If the electrode has been left dry soak the tip in storage solution for at least one hour to reactivate it e Toprolong the electrode life it is recommended to clean it monthly by immersing the tip in A7061M general cleaning solution for 30 minutes Afterwards rinse it thoroughly with tap water and recalibrate the meter e The electrode can be easily replaced by unscrewing the body as shown below Electrode body BATTERY REPLACEMENT When the batteries become weak the battery symbol on the LCD lights up to indicate a low battery condition Batteries should be replaced soon To change the batteries unscrew and release the electrode body Take out the batt
4. ery compartment and carefully replace all four batteries while paying attention to their polarity Reattach and tighten the electrode body properly to ensure a watertight seal
5. manual FRONT PANEL amp DISPLAY Dual line LCD ON OFF MODE button pH electrode amp temperature sensor Electrode body Battery compartment inside SET HOLD button Clip holder NUNDU PWN zug LAL 0088 yes 1 Stability indicator hourglass symbol 2 Low battery warning indicator 3 Calibration mode calibrated meter indication 4 ATC Automatic Temperature Compensation indicator 5 Secondary LCD level 6 Primary LCD level 7 Measurement unit for primary level TECHNICAL DATA Range 2 0 to 16 0 pH AD11 2 00 to 16 00 pH AD12 5 0 to 60 0 C 23 0 to 140 0 F 0 1 0 01 pH 0 1 C 0 1 F Accuracy 20 C 68 F 0 1 0 01 pH 0 5 C 41 F Resolution pH Calibration Automatic 1 or 2 point with 2 sets of memorized buffers pH 4 01 7 01 10 01 or 4 01 6 86 9 18 pH Electrode AD11P included Temperature Compensation Automatic Battery Type 4x 1 5V button type Battery Life Approx 300 h of use Auto off After 8 minutes of non use Environment 5 to 50 C 23 tol22 F RH 100 Dimensions 175 5 x 39 x 23 mm Weight 100 g ELECTRODES amp SOLUTIONS AD11P Spare pH electrode A70004P pH 4 01 buffer 20 ml 25 pcs A7004M pH 4 01 buffer 230 ml bottle A70007P pH 7 01 buffer 20 ml 25 pcs A7007M pH 7 01 buffer 230 ml bottle A70010P pH 10 01 buffer 20 ml 25 pcs A7010M pH 10 01 buffer 230 ml bottle A7061M Electrode cleaning solution 230
6. ml A70300M Storage solution 230 ml OPERATIONAL GUIDE Turn the meter on e Press and hold the ON OFF MODE button until the LCD lights up All the used segments will be visible for one second or as long as the button is pressed Freeze the display e While in measurement mode press the SET HOLD button The reading will be frozen on the LCD Press any button to return to normal mode Turn the meter off e While in measurement mode press the ON OFF MODE button OFF will appear on the secondary display Release the button Note If measurements are taken in different samples successively rinse the probe thoroughly to eliminate cross contamination After cleaning rinse the probe with some of the sample to be measured pH MEASUREMENT amp CALIBRATION Taking Measurement e Submerge the electrode in the solution to be tested while stirring it gently e Measurements should be taken when the stability indicator hourglass disappears e The pH value automatically compensated for temperature is shown on the primary LCD level while the secondary one shows the sample temperature Note Before taking any pH measurement make sure the meter has been calibrated CAL tag is displayed pH Calibration For better accuracy frequent calibration of the instrument is recommended In addition the instrument must be recalibrated whenever a The pH electrode is replaced b After testing aggressive chemicals c Where high accuracy i
7. s required d At least once a month Calibration Procedure e From normal measuring mode press and hold the ON OFF MODE button until OFF on the secondary LCD is replaced by CAL e Release the button The LCD enters the calibration mode displaying pH 7 01 USE or pH 6 86 USE if the NIST buffer set was selected e The meter automatically recognizes buffers if a valid buffer is detected then its value is shown on the primary display and REC appears on the secondary LCD level If no valid buffer is detected the meter keeps the USE indication active for 12 seconds followed by WRNG indicating the buffer being measured is not a valid calibration value Single Point Calibration e For a single point calibration with buffers pH 4 01 9 18 or 10 01 the meter automatically accepts the calibration when the reading is stable The accepted buffer is displayed together with the message OK 1 for one second then the meter automatically returns to the normal measuring mode e Ifa single point calibration with buffer pH 7 01 or pH 6 86 is desired then after the calibration point has been accepted press the ON OFF MODE button to return to normal mode The meter shows 7 01 or 6 86 and OK 1 for one second then it automatically returns to the normal mode Note For better accuracy it is recommended to perform a 2 point calibration Two Point Calibration e Fora two point calibration place the electrode
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