Oakton pH 5/6 Instruction Manual

Also see for ION 6: Operating instructions

Oakton pH 5/6 Instruction Manual Manual pdf 9 page image

Instruction Manual pH 5/6 & Ion 673. CALIBRATION3.1 pH CalibrationThe meter is capable of calibrating up to 3 points using USA or NIST (nSt) pH bufferstandards or 2 points with Low Ionic (Pb) pH buffer standard. All new calibration valueswill automatically override existing data.USA pH 4.01, 7.00 and 10.01NIST pH 4.01, 6.86 and 9.18Pb pH 4.10 and 6.97It is recommended that you perform at least 2-point calibration at room temperature (25oC) using standard buffers, starting with first buffer at pH 7.00 (USA), pH 6.86 (NIST) orpH 6.97 (Pb) followed by other buffer values.For a 1-point calibration, calibration should be performed with a pH buffer value closestto the expected sample value being measured. Otherwise calibrating at pH 7.00, pH6.86 or pH 6.97 is advisable.The meter has automatic buffer recognition that identifies the correct pH buffer valuesduring calibration. If non-standard pH buffers other than the above standards are used,or the electrode has worn out, the LCD will flash “Er1”. Press the CAL key to abortcalibration and resume measurement. In general all pH buffer values have the windowof up to +/- 1 pH tolerance during calibration.Ensure that you use new pH buffer solutions or sachets during calibration. Do not reusebuffer solutions as it may be contaminated and affect the calibration and accuracy ofmeasurements. Always store buffer solutions in a dry, cool environment if possible.Before use, remove the plastic protective cap of pH electrode and condition the glassbulb by soaking it in tap water for 1-2 hours. This hydrates the glass bulb if electrode istoo dry or has not been used for a long period of time. Always rinse the probes with tapwater or rinse solution before and after each calibration/sample measurement to avoidcross-contamination. For details refer to section 5 on Electrode care and maintenance.