Macro 900 Operation Manual V3© 2013 Palintest Ltd. www.palintest.com Page 62 of 14715.2.6. Zero Point CalibrationTo calibrate the zero point, follow these steps:1. Fill a calibration bottle with distilled water, remove the storage cap fromthe pH probe if fitted, wash the Probe in distilled water, then drop theProbe in all the way. The Sleeve End Cap and Plug must be fitted.Bang the Probe against the bottom of the bottle several times in order toremove any air bubbles that may be clinging to the probe.2. Switch the Macro 900 Meter on and wait until the temperature and BGA-PC readings are stable. If the BGA-PC reading is very high, there areprobably air bubbles adhering to the lenses. Bang the Probe against thebottom 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 Probes6. Select Aux Probes. The screen will change to:SELECT PROBEÆ1:BGA-PC l 4:N/A2:EMPTY l 5:N/A3:N/A l 6:N/AThe BGA-PC probe should have been assigned to AUX socket 1when it was fitted. Press the OK or right arrow key to select BGA-PC. The screen will change to:CALIBRATE BGA-PCÆ Pt-1? [01/Jan/12]Pt-2? [01/Jan/12]
