Macro 900 Operation Manual V3© 2013 Palintest Ltd. www.palintest.com Page 95 of 14716.4.2. Three-point CalibrationDuring three-point calibration, the MAP 2000/2100 and Macro 900 Meter mustremain switched on. If the Macro 900 Meter is switched off between points, thecalibration process will be aborted and must be re-started from point 1. Tocalibrate the ISE electrode follow these steps:Point 1.1. Remove the storage cap from the pH electrode, wash the Probe indistilled water, dry the probe thoroughly then drop the Probe in to thewarm 10ppm solution.2. Switch the Macro 900 Meter on and stir the probe until the temperatureand NH4 readings are completely stable. A minimum of five minutes isrecommended.3. Ensure the temperature of the solution is between 20ºC and 40ºC (68ºF -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 Electrodes6. Select Aux Electrodes. The screen will change to:SELECT ELECTRODEÆ1:TURB l 4:N/A2:NH4 l 5:N/A3:N/A l 6:N/AThe Ammonium (NH4) electrode should have been assigned to AUXsocket 2 when it was fitted. Move the pointer down to 2:NH4 thenpress the OK or right arrow key to select.7. The screen will change to:CALIBRATE NH4ÆPt-1? [01/Jan/12]Pt-2? [01/Jan/12]Pt-3? [01/Jan/12]Calibration point 1 (Pt-1) is the warm 10ppm point. Calibration point 2
