Thermo Scientific Orion AQUAfast AQ3010 Turbidity Meter User Guide
The four bottles of calibration standards supplied with your meter are
more stable than Formazin, do not need to be shaken and have a shelf life
of 12 months . If you use the supplied calibration standards to calibrate
the instrument, review the expiration date (indicated on the bottle label)
to ensure that the standards have not expired .
Note:
It is important that the calibration standards are not violently
shaken or agitated because air entrapment in the fluid introduces an error
factor during calibration which subsequently will lead to an inaccurate
measurement . Also, do not store in freezing temperatures which
causes irreversible shrinkage of the standards’ particles thus resulting to
inaccurate calibration and measurement .
Before using the meter for the first time, rinse the inside of the vial with a
small amount of the same NTU standard that will be used to fill that vial .
1 . Gently pour about 5 mL of the standard into the vial .
2 . Cap and swirl the vial so the inside of the vial is fully rinsed with
the standard .
3 . Pour the standard out of the vial .
4 . Repeat steps 1 through 3 .
5 . Gently pour the standard into the vial up to the mark on the vial and
cap the vial .
6 . Repeat this rinse and filling procedure for the other three vials .
Note:
The vial rinsing is most critical for precision with the lower
NTU standards .
It is recommended to use the prepared calibration standard vials daily as
check standards prior to the measurement of samples .
Preparing and
Filling the
Calibration
Standard
Vials
