Hanna Instruments HI8417 Instruction Manual

Contents

Hanna Instruments HI8417 Instruction Manual Manual pdf 18 page image

18IMPORTANTThe instrument's pH range should be re-calibrated:• When the meter is new.• Whenever the pH electrode is replaced.• At least once a month.• After use in aggressive chemicals.• After cleaning procedure and changing the reference electrolyte.• For greatest accuracy.INITIAL PREPARATIONPour small quantities (up to 4cm / 1½" level)of pH 7.01 (HI7007 or HI8007) and pH4.01(HI7004 or HI8004) or pH 10.01 (HI7010or HI8010) solution into clean beakers. Ifpossible use plastic beakers to minimize anyEMC interferences.If you are measuring in the acid range use pH4.01 as second bufferor pH 10.01 if you are measuring in the alkaline range.Note: with HI8417 HI7006/HI8006 (pH 6.86) and HI7009/HI8009(pH 9.18) can be used in place of HI7007/HI8007 (pH 7.01)and HI7010/HI8010 (pH 10.01) respectively.For accurate calibration, use two bea-kers for each buffer solution; the firstfor rinsing the electrode, the secondfor calibration. In this way, contami-nation of the buffer is minimized.Note: the electrode should be submerged approxi-mately 4 cm (1½") into the solution. If thetemperature probe is used, it should be posi-tioned as close to the pH electrode as possible.PH CALIBRATION FOR HI8417HI8417 provides 6 pre-programmed calibration buffers: three NBSbuffers (d1, d2, d3 i.e. pH 6.86, 4.01, 9.18 respectively) and threetechnical buffers (t1, t2, t3 i.e. pH 7.01, 4.01, 10.01 respectively).When the ATC probe is not used, make sure the temperature is setmanually to reflect the temperature of the solution (see page 23).HI 7007RINSEHI 7007CALIBRATION4 cm(1½")PH CALIBRATIONHI 7004 HI 7007HI 7004