palintest Macro 900 Operation Manual

Contents

palintest Macro 900 Operation Manual Manual pdf 39 page image

Macro 900 Operation Manual V3© 2013 Palintest Ltd. www.palintest.com Page 39 of 147record book for the Probe. When the offset voltage details have been noteddown, press OK then ESC repeatedly to return to normal reading mode.Remove the Probe from the calibration bottle, rinse thoroughly in de-ionisedwater, shake off any excess and dry the outer sleeve with a soft cloth.13.5.2. Calibrating the Second PointThe pH electrode can now be calibrated at either pH 4.01 or pH 10.00. If youintend to calibrate at both pH 4.01 and pH 10.00, both points must becalibrated in the same session, i.e. without turning the power off.If the power is removed after calibrating just one additional point (pH 4.00 forexample), the probe will automatically calculate and save a calibration value forthe uncalibrated third point in order to maintain the electrode's linearity.To calibrate the second point, fill a calibration bottle with fresh pH 4.01 or pH10.00 solution and drop the Probe in all the way. Follow the procedure detailedabove, but at step 6, select either pH4.01 or pH10.0, dependent upon thesolution you are using. Wait while the Meter stabilises and calibrates. When the‘Calibrating 100%’ screen is displayed, the calibration report will display theslope for the pH electrode in millivolts (mV) per pH unit. If this slope goesbelow 45mV/pH at 25°C, the pH electrode should be serviced. Press OK thenpress the ESC key repeatedly to get back to the main display.Remove the Probe from the calibration bottle, rinse thoroughly in fresh water,shake off any excess and dry the outer sleeve with a soft cloth.13.5.3. Calibrating the Third PointWithout switching the Macro 900 Meter off or disconnecting the Probe, fill acalibration bottle with fresh pH 4.01 or pH 10.00 solution and drop the Probe inall the way. Follow the procedure detailed above, but at step 6, select eitherpH4.01 or pH10.0 dependent upon the solution you are using. Wait while theMeter stabilises and calibrates. When the ‘Calibrating 100%’ screen isdisplayed, the calibration report will display the slope for the pH electrode inmillivolts (mV) per pH unit. If this slope goes below 45mV/pH at 25°C, the pHelectrode should be serviced. Press OK then press the ESC key repeatedly toget back to the main display.Remove the Probe from the calibration bottle, rinse thoroughly in fresh water,shake off any excess and dry the outer sleeve with a soft cloth. Dampen thesponge in the storage cap with storage solution and fit it to the pH/ORPelectrode. pH calibration is now complete.13.6. Errors During CalibrationIf a problem occurs during calibration, an error message will be displayed.Refer to Error! Reference source not found. in section 10 for error messagehandling.13.7. pH Electrode EfficiencyIf the pH electrode becomes worn or clogged, its efficiency and response time