OPERATOR AND UNIT MAINTENANCE MANUAL
(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)
FOR WATER QUALITY ANALYSIS SET: PURIFICATION (WQAS-P)
DESCRIPTION AND USE OF CONTROLS AND INDICATORS FOR TURBIDITY METER
HOW TO ENSURE ACCURATE CALIBRATION
The instructions listed below should be carefully followed during testing and during calibration:
All glassware that comes into contact with standards should be maintained clean. Wash with cleaning solution and
rinse with turbidity standard, 0 FTU or turbidity-free water.
Rinse the vial twice with 5 ml of the liquid to be tested. This removes the effect of any previous liquid and any dust or
foreign matter that may be present inside. Gently pour the liquid down the side of the vial to reduce air bubbles (no
mixing is required when turbidity standard, 0 FTU and turbidity standard 10 FTU AMCO-AEPA-1 standards are used).
Before inserting the vial into the instrument, wipe it with soft, lint-free tissue. Handle vials so that no fingerprints can
get on the areas where light passes (approximately 2 cm/1 inch from the bottom of the vial).
Presently, there are only two recognized primary standards: AMCO-AEPA-1 and formazine.
The Turbidity Meter is supplied with the AMCO-AEPA-1 which has a much longer shelf life at all
concentrations (approximately six months, if free from contamination). In addition, no special
handling or disposal is required and a much higher stability of suspended particles has been
On the other hand, formazine is a very toxic substance, generated by a known carcinogen, its
stability is poor (particles flocculate and settle quickly). Lower concentrations change value within
a few days or hours after dilution from stock solutions.
The consistency of the Turbidity Meter readings by using both standards has been separately
established by Advanced Polymer Systems and Hanna Instruments.
VIEWING THE CALIBRATION DATE
Turn the meter on and wait for the display to show "----".
Press and hold the DATE/⇒ key and a "MM.DD" message appears while the key is held.
Note: The displayed
date is the date that
by the user at the beginning
of the last calibration.
All components have been selected to minimize current drain without compromising functionality.
In order to minimize the battery consumption, the meter is equipped with an auto-shut off function which
switches the meter off after 4 minutes of non-use.
The power source is 4 x 1.5V batteries with an expected life of 60 hours, or over 900 measurements.
To always grant accurate measurements, the batteries are monitored to ensure that readings are not taken
when there is insufficient power.