Oakton 35632-Series Operating Instructions Manual

Oakton 35632-Series Operating Instructions Manual Manual pdf 8 page image

Dissolved Oxygen calibration in percent saturationYou can calibrate this meter quickly and easily in air. The exact calibration valuedepends on barometric pressure. The meter is set to a factory default of 760 mm Hg,which results in a calibration value of 100% saturation in air.NOTE: If the barometric pressure setting has been changed from 760 mm Hg, thecalibration value in air will automatically adjust to a value other than 100%.The adjusted value will be correct for the new barometric pressure setting.• See page 39 to change the pressure setting.• See Appendix 2 on page 67 for a chart of adjusted % saturation values.1514To calibrate 100 % saturation:1. Rinse the probe well with deionizedrinse water or rinse solution. For bestaccuracy, wrap the end of the probein a damp cloth. Do not touch themembrane.2. Press the MODE key to select the% saturation mode.See figure3. Press the CAL key. The CAL indicatorwill appear above the primary display.The primary display shows the currentvalue of the measurement and thesecondary display will show 100.0(see NOTE above).See figure4. Hold the probe in the air (or in dampcloth). Wait for the reading to stabilize.If the Ready indicator feature is enabled,it will appear when the reading is stable(see page 43 for Ready indicator setup).5. Press the ENTER key. The meter auto-matically calibrates to 100.0% air satura-tion and returns to Measurement mode.See figureATCREADYMEAS %CREADYCAL %ATCREADYMEAS %C4.5AABCBCNotesThe reading in the primary display in step 3 must read at 50% or above for thecalibration to work correctly. Whenever an error occurs during calibration, theERR indicator appears in the lower left hand corner of the display.You can offset your % DO calibration: see page 40 for directions.Preparing the meter for DO calibrationBefore calibrating your meter, make sure to rinsethe DO probe well with de-ionized water or rinsesolution.NOTE: Do not let membrane surface of the DOprobe touch any other surface. The DOprobe guard (the piece with holes fittedover the end of the probe) protects themembrane; make sure this is alwaysattached to the probe while it is in use.You can calibrate for dissolved oxygen in either% saturation or mg/l (ppm). All new DOcalibrations automatically override existingDO calibration data.Before Dissolved Oxygen calibrationBefore starting DO calibration, make sure you are inthe correct measurement mode. When you switchon the meter, the meter starts up in the units lastused (either pH, mg/l, ppm, % saturation). Forexample, if you shut the meter off in “mg/l” units,the meter will read “mg/l” units when you switchthe meter on.NOTE: Most users will calibrate to 100% saturationeven when working in mg/l. When calibrat-ing the meter in mg/l mode, you can makefine adjustments, typically to a midrangevalue between 10 and 100%. If you arecalibrating to a midrange value, you needto set the 100% saturation value first.4.4DO Probe guard