Oakton pH 5 Instruction Manual

Also see for Ion 6+: Instruction manual Instruction manual

Contents

Oakton pH 5 Instruction Manual Manual pdf 10 page image

Instruction Manual pH 5+, pH 6+, Ion 6+-7-3. CALIBRATION3.1 pH CalibrationThe meter is capable of calibrating up to 3 pH values using USA or NIST (nSt) pH bufferstandards or 2 pH values with Low Ionic (Pb) pH buffer standard. All new calibrationvalues will automatically override existing data.USA group 4.01, 7.00, 10.01NIST group 4.01, 6.86, 9.18Pb group 4.10, 6.97For best results perform at least a 2-point calibration at room temperature (25 o C) usingstandard buffers. Begin with pH 7.00 (USA group), pH 6.86 (NIST group) or pH 6.97 (Pbgroup).For a 1-point calibration, calibration should be performed with a pH buffer value closestto the expected sample value being measured.The meter has automatic buffer recognition that identifies the correct pH buffer valuesduring calibration. The meter will accept calibration values that are within +/-1.0 pH unitsof the expected value, otherwise the LCD will flash “Er1” and the value will not beaccepted. Press CAL to abort calibration and resume measurement.Always use new pH buffer solutions for calibration. Do not reuse buffer solutions as itmay be contaminated and affect the calibration and accuracy of measurements.Promptly seal containers and store solutions in a dark, dry, cool environment.Before use, remove the plastic protective cap of pH electrode and condition the glassbulb by soaking it in tap water or pH buffer (preferably pH 4) for 1-2 hours. This hydratesthe glass bulb if the electrode is too dry or has not been used recently. Always rinse theprobes with clean water before and after each calibration/sample measurement to avoidcross-contamination. For details refer to section 5 on Electrode care and maintenance.3.1.1 pH Calibration Procedure1. Pour known pH buffer calibration standard solution into a clean, dry container, e.g.pH 7.00. Turn on meter and select pH mode by pressing MODE key if necessary.2. Dip the pH electrode and temperature probe into the solution. Swirl gently and waitfor reading to stabilise (approx. 30 seconds depending on your electrode condition).