pH Sensor
Contents
1. 5 Click Set Sensor Factory Defaults Calibrating the pH Sensor Using a LabQuest or LabQuest 2 1 Connect the pH Sensor to your LabQuest The pH reading will be displayed 2 Choose Calibrate P CHI pH from the Sensors menu and tap Calibrate Now 3 Remove the storage bottle from the pH Sensor rinse the tip of the sensor with distilled water and place the sensor in the first buffer solution so the tip is immersed 4 Enter the pH ofthe buffer solution as the known value for Reading 1 When the voltage reading stabilizes tap Keep 5 Rinse the pH sensor with distilled water and place it in the second buffer solution 6 In the Reading 2 field enter the pH of the second buffer solution When the voltage reading stabilizes tap Keep 7 Optional Ifyou wish to store the calibration on the sensor itself tap the Storage tab at the top of the screen If you wish to use the calibration only for the current experiment skip to Step 9 8 On the Storage page tap Save Calibration to Sensor A message will appear Saving this calibration to the sensor will result in it being the new Custom Calibration 1 Tap OK to proceed 9 Tap OK to compete the calibration process After you store a calibration to the pH Sensor this new calibration will be used automatically regardless ofthe interface to which the pH Sensor is connected You can set the pH sensor back to its factory calibration by following these steps 1 Choose2. epoxy body ABASI Response time 90 of final reading in 1 second in a buffer Temperature range 5 to 80 C readings not compensated Range phoi Resolution 13 bit Sensor DAQ 0 0025 pH units bt LabPro LabQuest LabQuest2 0 005 pH units TINspire Lab Cradle LabQuest Mini Go Link SBI ULLI 10 bit CBL 2 0 02 pH units Isopotential pH pH 7 point at which temperature has no effect Stored calibration values slope 3838 intercept 13 720 PH Sensor Accessories tem Order Code Electrode Storage Solution S00 ml PH SS Bufer Tablets PHB Storage Solution Bottles pkg of5 BTL 6 Warranty Vemier warrants this product to be free from defects in materials and workmanship for a period of five years from the date of shipment to the customer This warranty does not cover damage to the product caused by abuse or improper use Additionally the warranty does not cover accidental breakage of the glass bulb of the pH Sensor Measure Analyze Learn Vernier Software amp Technology 19079 S w Makan Way Beaverton OR 97005 2886 at Free 888 837 8437 803 277 209 FAK 503 277 2440 intogverrier com www vernier com Tium Pre Lamus tats ami Venia aM Venier a Li Vener a at inoran
3. Calibrate P CHI pH from the Sensors menu 2 Tap the Storage tab 3 Tap Restore Sensor Factory Defaults pH Buffer Solutions In order to calibrate a pH Sensor or to confirm that a saved pH calibration is accurate you should have a supply of pH buffer solutions that cover the range of pH values you will be measuring We recommend buffer solutions of pH 4 7 and 10 Vernier sells a pH buffer kit order code PHB The kit contains 4 tablets each of buffer pH 4 7 and 10 and a small bonle of buffer preservative Each tablet is added to 100 mL of distilled water to prepare respective pH buffer solutions Flinn Scientific www flinnsci com Tel 800 452 1261 sells a wide variety of buffer tablets and prepared buffer solutions You can prepare your own buffer solutions using the following recipes Tan On TN paS pH400 hydrogen phthalate To Bad 882 mL e01 MNGOH TmT es potassium dihydrogen phosphate AGE 2A mL of 0 1 M NSO fo T000 TAL oO M saa PH 10 00 bicarvonste Maintenance and Storage Short term storage up to 24 hours Place the electrode in pH 4 or pH 7 butler solution Long term storage more than 24 hours Store the electrode in a pH 4 buffer KCI storage solution in the storage bottle The pH Electrode is shipped in this solution Verner sells 500 ml bottles of pH Storage Solution order code PH SS or you can prepare additional storage solution by adding 10 g of solid potassium chlor
4. and the following data collection software Logger Pro 3 This computer program is used with LabQuest 2 LabQuest LabQuest Mini LabPro or Go Link Logger Lite This computer rogram is used with LabQuest 2 LabQuest LabQuest Mini LabPro or Go Link LabQuest App This program is used when LabQucst 2 or LabQuest is used asa standalone device DataQuest Software for TI Nspire This calculator application forthe TENspire can be used with the EasyLink or TI Nspire Lab Cradle EasyData App This calculator application for the TS Plus and TI 84 Plus can be used with CBL 2 LabPro and Vernier EasyLink We recommend version 2 0 or newer which can be downloaded from the Vernier web site wyrw vernier com easy easydata html and then transferred to the calculator See the Vernier web site wv vemir comicalesoftwarelindex html for more information on the App and Program Transfer Guidebook DataMate program Use DataMate with LahPro or CBL 2 and TI 73 TL83 TI 84 TLN6 11 89 and Voyage 200 calculators See the LabPro and CBL 2 Guidebooks for instructions on transferring DataMate to the calculator LabVIEW National Instruments LabVIEW software is a graphical programming language sold by National Instruments It is used with Sensor DAQ and can be used with a number of other Vernier interfaces See www vemnier com labview for more information Tiis sensor is equipped wih cireuliry that supports auloD When us
5. de the cap onto the electrode body and then screw the cap onto the storage bottle so the tip of the electrode is immersed in the storage solution When the probe is not being stored in the storage bottle it can be stored for short periods of time up 19 24 hours in pH 4 or pH 7 buffer solution should never be stored in distilled water It is a good idea to prepare a quantity of PH 4 buffer KCI storage solution sce the section on Maintenance and Storage and use it to replace lost solution Calibration For many experiments calibrating the pH Sensor is not required We store a calibration equation on each pH sensor before shipping it which is used as a default by our software For the most accurate measurements with this sensor we recommend calibration It is a simple process that takes only a few minutes Calibrating the pH Sensor Using Logger Pro 3 Before starting the calibration obtain two buffer solutions and some distilled water sing pH 4 and pH 7 buffer solutions work well but any two buffers will be 1 Connect the pH Sensor to your computer with a Vernier computer interface LabPro Go Link LabQuest Mini LabQuest or LabQuest 2 2 Choose Calibrate CHI pH from the Experiment menu and then click Calibrate Now 3 Remove the storage bottle from the pH Sensor rinse the tip of the sensor with distilled water and place the sensor in the first buffer solution so the tip is immersed 4 Near the middle righ
6. ed wilh LabQuest 2 LabQuest LabQuest Mini LabPro Go Link Sensor DAQ TI Nspire Lab Cradle EasyLink or CBL 2 the data collection software identifies the Sensor and uses pre defined parameters to configure an experiment appropriate 1o the recognized sensor How the pH Sensor Works The pH amplifier inside the handle is a circuit which allows the standard combination pH electrode to be monitored by a lab interface The cable from the pH amplifier ends in a BTA plug The pH Sensor will produce a voltage of approximately 1 75 volts in a pt 7 buffer The voltage will increase by about 0 25 volts for every pH number decrease The voltage will decrease by about 0 25 vots pH number as the pH increases The Vernier gel filed pH Sensor is designed to make measurements in the pH range of Oto 14 The gel filled reference half cells sealed it cannot be refilled Preparing for Use To prepare the electrode to make pH measurements follow this procedure Remove the storage bottle from the electrode by first unscrewing the lid and then removing the bottle and lid Thoroughly rinse the lower section of the probe Especially around the bulb shaped tip using distilled or deionized water Connect the pH Sensor to your lab interface and run data collection software Note Do not completely submerge the sensor The handle is not waterproof When you are finished making measurements rinse the electrode with distilled water Sli
7. ide KCI to 100 mL of pH 4 buffer solution Flinn Scientific 800 452 1261 sells a Buffer Solution Preservative order code B0175 that can be added to this storage solution By storing the electrode in this solution the reference portion ofthe electrode is kept moist Keeping the reference junction moist contributes to electrode longevity and retains electrode response time when the unit is placed back into service Ifthe electrode is inadvertently stored dry immerse the unit in pH 4 buffer KC storage solution for a minimum of eight hours prior to service When testing a pH Sensor it is best to measure a buffer solution because it is easier to determine if the sensor is reading correctly Do not test your sensor by measuring distilled water Distilled water can have a pH reading in the range of 5 5 7 0 due to varying amounts of dissolved carbon dioxide Furthermore due to a lack of ions the DH values reported with the sensor in distilled water will be erratic If your pH Sensor is reading differently from the pH ofa buffer solution eg reads 6 7 in a buffer 7 you may simply need to calibrate the sensor 1f your readings are off by several pH values the pH readings do not change when moved from one buffer solution to another different buffer the sensor was stored dry or the sensor s response seems slow the problem may be more serious A method called shocking can be used to revive pH electrodes To shock your pH Sensor perform
8. pH Sensor Order Code PH BTA Our pH Sensor can be used for any lab or demonstration that can be done with a traditional pH meter including acid base titrations monitoring pH in an aquarium and investigating the water quality of streams and lakes Inventory of Items Included with the pH Sensor pH Sensor Electrode Storage bottle containing pH 4 KC solution NOTE Vernier products are designed for educational use Our products are not designed nor recommended for any industrial medical or commercial process such as life support patient diagnosis control of a manufacturing process or industrial testing of any kind Collecting Data with the pH Sensor This sensar can be used with the following interfaces to collect data Vernier LabQuest 2 or original LabQuest as a standalone device or with a computer Vernier LabQuest Mini with a computer Vemier LabPro with a computer or TI graphing calculator Vernier Go Link Vernier EasyLink Vernier SensorDAQ cat TLNspire Lab Cradle Tere is he general procedure to follow when using he pH Sensor 1 Connect the pH Sensor to the interface 2 Start the dats colleetion software 3 The software will identify the pH Sensor and load a default data collection setup You are now ready to collect data Important Do not fully submerge the sensor The handle is not waterproof Data Collection Software This sensor can be used with an interface
9. t of the calibration dialog box you will se the potential ouput of the pH sensor in volts Type the pH of the buffer solution in which the sensor rests in the edit box When the displayed voltage reading stabilizes click Keep 5 Rinse the pH sensor with distilled water and place it in the second buffer solution The potential voltage will change Type the pH of the second buffer solution in the second edit box When the displayed voltage reading stabilizes click Keep 6 Optional If you wish to store the calibration on the sensor itself click the Calibration Storage tab If you wish to use the calibration only for the curent experiment skip to Step 10 Ic Set Sensor Calibration Make sure the Default Page corresponds to your new calibration Click Set 8 Click Done You will be prompted by the message Warning You are about t change information in your sensor Configuration data stored on the sensor will be lost Pressing Write will apply your changes to the sensor Click Write 9 Click Done to complete the calibration process You have now stored the calibration on the sensor itself This new calibration will be used from now on until you replace it by conducting another calibration or by reverting to the factory calibration You can set the pH sensor back to its factory calibration by following these steps 1 Select Calibrate gt CHI pH from the Experiment mens 2 Click the Calibration Storage tab
10. the following 1 Soak the pH Electrode for 4 8 hours in an HCI solution of 0 1 M 0 5 M 2 Rinse off the electrode and soak the tip in pH 7 buffer for 30 60 minutes 5 Rinse the electrode and test it with buffer solutions of known pH Occasionally mold will grow in the pH 4 bufferstorage solution Mold will not harm the electrode and can easily be removed using a mild detergent solution Mold growth in the storage solution can be inhibited by adding a buffer preservative The pl sensor is designed to be used in aqueous solutions The polycarbonate body ofthe sensor can be damaged by many organie solvents In addition do not use the Sensor in solutions containing perchlorates silver tons sulfide ions biological Sample with high concentrations of proteins or Tris buffered solutions Do not use the sensor with hydrofluoric acid or in acid or base solutions with a concenaion seater than 1 0 molar Vemier offers a Tei Compatible Flat pH Sensor whieh features a double junction electrode so tcan be used with proteins sulfides and Tris buffers Order code FPH BTA The electrode may be used to measure the pH of sodium hydroxide solutions with a concentration near 1 0 molar but should not be left in this concentration of sodium hydroxide for periods longer than 5 minutes Using or storing the electrode at very high temperatures gt 80 C or very low temperatures near 0 C can damage it beyond repair Type Sealed gel filled
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