Hach Orbisphere 410 Basic User Manual

Also see for ORBISPHERE 410: Basic user manual Quick operator's guide User manual User manual Basic user manual

O2 sensor calibrationThe O2 sensor needs to be calibrated after each sensor service. Wait at least 30 minutes aftermounting a new membrane before re-calibrating. The sensor is in contact with either:• Air at atmospheric pressure (In Air)• O2 at known concentration (Direct value). The gas can be dissolved or not.In air calibrationThis calibration procedure places the O2 sensor in water-saturated air, to provide a known oxygenreference against which to calibrate.Dry the sensor thoroughly, before placing the sensor storage cap under tap water. Shake off anyexcess water, but leave a few drops inside the cap. Verify that the screw-on protection cap is in placeon the sensor head. If you use a Dacron mesh inside the protection cap, make sure it is dry beforeattempting to calibrate. Then, loosely place the storage cap back on the sensor, holding it in placewith a few turns of its collar.Set the calibration parameters accordingly and press calibrate.Direct calibrationThis procedure calibrates the oxygen sensor against a liquid sample containing a known level ofdissolved O2 flowing through the sample line.The instrument displays the sensitivity of the sensor as a percentage of the sensitivity determinedwhen calibration was last performed.Set the calibration parameters accordingly and press calibrate.O3 sensor calibrationThe sensor is either in contact with:• Air at atmospheric pressure (In Air)• O3 at known concentration (Direct Value). The gas can be dissolved or not.The procedure is the same as for the O2 sensor. In the case of the "In air" calibration, the sensormeasures O2 during calibration. The O3 coefficient is deduced taking into account how the sensorbehaves in O2. As a different voltage is used at the anode to measure O2 and O3, the O3measurement takes a long time to stabilize. To facilitate the follow up after an "O3 in air" calibration,negative values can be displayed.TC sensor calibrationCalibration of the measured gas1. Before initiating a calibration process, the calibration parameters must be set by pressing on theModify button. The last calibration parameters are memorized, so this step can be ignored if thecorrect parameters are already set. Similarly, if only the calibration value has changed, then thiscan be updated directly instead of pressing the Modify button.Option DescriptionGas Phase Select liquid or gas (direct calibration only)Gas unit type Partial, fraction or dissolved (dissolved is for calibration in a liquid only)Gas unit The list of available units depends on unit type selected above.Liquid Select as appropriate.Value Enter the gas concentration according to the value in the calibration media.English 21