palintest Macro 900 Operation Manual

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palintest Macro 900 Operation Manual Manual pdf 55 page image

Macro 900 Operation Manual V3© 2013 Palintest Ltd. www.palintest.com Page 55 of 147The lens system in the Turbidity Electrodes is designed to focus correctly inwater. When the Probe is not submerged, the system will be out of focus andrandom readings will occur. This is normal.15.1.3. Calibrating the Turbidity ElectrodesThe Probe Sleeve, Sleeve End Cap and End Cap Plug form an integral,working part of the Probe’s turbidity measurement system, and MUSTbe fitted during calibration and measurement for correct operation.Calibration of the Turbidity electrode Zero NTU point is normally carried outduring MacroCal (see MacroCal Calibration Method).The Turbidity electrode should be calibrated at the Zero NTU point before eachday’s use, and at least once a month at 1000 NTU to ensure optimum accuracy.To avoid air bubbles in the calibration solutions, never shake the bottles.15.1.4. Turbidity Zero Point CalibrationTo calibrate the Turbidity zero point, follow these steps:1. Fill a calibration bottle with de-ionised water or fresh MacroCal solution,remove the storage cap from the pH electrode if fitted, wash the Probe indistilled water, then drop the MAP in all the way. The Sleeve End Capand Plug must be fitted. Bang the MAP against the bottom of the bottleseveral times in order to remove any air bubbles that may be clinging tothe Turbidity probe.2. Switch the Macro 900 Meter on and wait until the temperature andturbidity readings are stable. If the turbidity reading is very high, thereare probably air bubbles adhering to the lenses. Bang the MAP againstthe bottom of the bottle to remove.3. Ensure the temperature of the solution is between 5ºC and 40ºC (41ºF -104ºF).4. Press the MENU key then select Calibration. The following screen will bedisplayed.CalibrationÆMacroCalDO 100%Full Cal5. Select Full Cal. The screen will change to:CalibrationÆpH/ORPDO/ECAux Electrodes