User manual HANNA INSTRUMENTS HI 4010

[. . . ] E= Ea + 2. 3 RT/nF log A ion E= observed potential Ea= Reference and fixed internal voltages R= gas constant (8. 314 J/K Mol) n= Charge on ion (1-) A ion=ion activity in sample T= absolute temperature in K F= Faraday constant (9. 648 x 104 C/equivalent) 3 IV. Design elements of the HI 4010 and HI 4110 electrodes Cap HI 4010 Sensor Handle Sensing Crystal Upper Cap Upper Threads O-Ring Spring FLUORIDE Fill Hole O-Ring and Plug Outer Sleeve Ceramic Junction on Inner Stem Liquid junction Sensing Crystal 4 required: V. Equipment required · Hanna HI 5315 double junction reference electrode with HI 7075 fill solution for measurements with HI 4010. · Hanna HI 4222 pH/ISE/mV meter or other suitable ion or pH/mV meter. [. . . ] Due to shipping or storage the internal solution inside the electrode may have developed an air pocket near the membrane. Gently shaking the sensor down (like the old style mercury thermometer) will place the internal solution next to the membrane. Note: when the sensor is inverted an air pocket will be seen which is normal. Prepare HI 5315 reference electrode by filling outer electrolyte reservoir with HI 7075. Place sensor and reference electrodes into electrode holder and connect cable connectors to meter. Unwrap plastic film seal found over ceramic junction on inner stem and discard. Open the glass vial that contains the fluoride module (HI 4110-51) and remove from container. Ensure the o-ring is installed on module before screwing into inner stem. Due to shipping or storage the internal solution inside the module may have developed an air pocket near the membrane. Gently shaking the sensor down (like the old style mercury thermometer) will place the internal solution next to the membrane. Note: When inverted, an air pocket will be visible inside the sensor which is normal. Rinse inner stem with deionized water making certain to wet the o-ring found on the inner stem. 8 Deionized Water Remove Parafilm Install sensing module 6. Reassemble electrode by gently pushing the inner assembly into the outer body, sliding spring down cable, and screwing cap into place. Using the dropper pipette provided, add a few drops of HI 7075 fill solution to the electrode, wetting the oring and rinsing out the fill solution chamber. 9 9. Holding the body of the electrode gently press upper cap with your thumb. Release cap and verify electrode returns to its original position (you may need to gently assist for this to occur). 10. Tighten the electrode cap onto the body and fill electrode body until fill solution volume is just below fill hole. Position electrode in a Hanna HI 76404 electrode holder (or equivalent) and connect plug to meter. · · · · · · Quick Check of Electrode Slope Connect sensors to pH/mV/ISE meter. Record the mV when reading has 10 HI 4110 DE FLUORI TION NA COMBI · stabilized. Corrective action · Verify protective cap has been removed (HI 4010). · Verify plastic film has been removed from inner stem (HI 4110 or HI 5315 electrode). [. . . ] Storage and Care of the HI 4010 and HI 4110 sensors The HI 4010 sensor can be stored in standards near measured values for short periods of time and should be stored dry with the protective cap on when not in use for long periods of time. The model HI 4110 combination electrode can be left in standards that were used for calibration for short time periods. If the electrode will be used frequently and needs to be ready for use, take measures to prevent evaporation of fill solution. Top off fill solution, and replace o-ring and plug on fill hole opening. [. . . ]