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Macro 900 Operation Manual
The lens system in the Turbidity Electrodes is designed to focus correctly in
water. When the Probe is not submerged, the system will be out of focus and
random readings will occur. This is normal.
15.1.3.
Calibrating the Turbidity Electrodes
The Probe Sleeve, Sleeve End Cap and End Cap Plug form an integral,
working part of the Probe's turbidity measurement system, and MUST
be fitted during calibration and measurement for correct operation.
Calibration of the Turbidity electrode Zero NTU point is normally carried out
during MacroCal (see
The Turbidity electrode should be calibrated at the Zero NTU point before each
day'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 Calibration
To 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 in
distilled water, then drop the MAP in all the way. The Sleeve End Cap
and Plug must be fitted. Bang the MAP against the bottom of the bottle
several times in order to remove any air bubbles that may be clinging to
the Turbidity probe.
2. Switch the Macro 900 Meter on and wait until the temperature and
turbidity readings are stable. If the turbidity reading is very high, there
are probably air bubbles adhering to the lenses. Bang the MAP against
the 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 be
displayed.
5.
Select Full Cal. The screen will change to:
© 2013 Palintest Ltd.
MacroCal Calibration
Calibration
MacroCal
DO 100%
Full Cal
Calibration
pH/ORP
DO/EC
Aux Electrodes
www.palintest.com
Method).
V3
Page 55 of 147
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