User manual HANNA INSTRUMENTS HI 4113

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[. . . ] HI 4113 NITRATE COMBINATION HI 4000-50 SENSOR HANDLE Instruction Manual HI 4013 HI 4113 Nitrate Ion Selective Electrode Half-cell Combination 1 HI 4013 Nitrate Half-cell HI 4113 Nitrate Combination Electrode I. Introduction: The Hanna HI 4013 and HI 4113 are ion selective electrodes designed for the measurement of nitrate ions in aqueous solutions. They utilize a replaceable sensing module that contains an organic polymer membrane that is sensitive to nitrate ions. The HI 4013 is a half-cell electrode that requires a separate reference. [. . . ] Do not overtighten. 7 HI 4000-50 SENSOR HANDLE 3. Holding the assembled electrode at the cable end, shake the sensor to ensure internal fill solution that may have separated during shipping is in contact with inner membrane surface. Prepare HI 5315 reference electrode by filling electrolyte reservoir with HI 7078 fill solution. Place sensor and reference electrodes into electrode holder and connect cable connectors to meter. Soak the Nitrate electrodes membrane in a Nitrate containing standard (0. 001M) without ISA before calibration. HI 4113 The Hanna HI 4113 is shipped disassembled. The sensor is shipped with two HI 4113-51 modules. Unwrap Parafilm® seal found over ceramic junction on inner stem and discard. This is only used for shipping or long term storage. Do not touch the sensing membrane with the "H" hole pattern on it. Screw the cone into the inner stem finger tight. Do not over tighten. 8 Deionized Water Remove Parafilm Install sensing module 4. Rinse inner stem with deionized water making certain to wet o-ring found on the inner stem. Reassemble electrode by gently pushing the inner assembly into the outer body, sliding spring down cable, and screwing cap into place. Remove fill hole cover and o-ring on fill hole spout. Using the dropper pipette provided, add a few drops HI 7078 fill solution to the electrode. Invert the electrode to wet the o-ring and rinse the fill solution chamber. 9 7. Holding the body of the electrode gently press upper cap with your thumb. This permits the fill solution to drain out of the body. Release cap and verify electrode returns to its original position. (You may need to gently assist for this to occur). 8. Tighten the electrode cap onto the body and fill electrode body until fill solution volume is just below fill hole. [. . . ] A pH/ mV meter in mV mode and semi log graph paper may also be used. Two or more freshly prepared standards that are in the measurement range of the unknowns are measured in mV mode on the meter. These values are plotted on the semi-log paper and the points are connected to form a straight-line curve. When samples are measured, their mV values are converted to concentration by following the mV to the concentration axis on the semi-log plot. [. . . ]

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