Instruction Manual PD 3004.4 Dissolved Oxygen CalibrationBefore calibrating your meter, make sure to rinse the probe well with de-ionised water or rinsesolution.NOTEDo not let membrane surface of the probe touch anyother surface. The probe guard (the piece with holesfitted over the end of the probe) protects the membrane;make sure this is always attached to the probe while itis in use. See Figure 9.You can calibrate for dissolved oxygen in either %saturation or mg/L (ppm). All new calibrationsautomatically override existing DO calibration data.Figure 9: DO Probe guardBefore CalibrationBefore starting calibration, make sure you are in the correct measurement mode. When youswitch on the meter, the meter starts up in the units last used (either pH, mg/L (ppm) or % airsaturation). For example, if you shut off the meter in “mg/L” units, the meter will read “mg/L”units when you switch the meter on.NOTEMost users will calibrate to 100% saturation even when working in mg/L. When calibrating themeter in mg/L mode, you can make fine adjustments, typically to a mid-range value between10 and 100%. If you are calibrating to a mid-range value, you need to set the 100% saturationvalue first.12
