39
SECTION 3, continued
5. Rinse the sample cell at least one time with the standard and discard
the rinse.
6. Immediately fill the sample cell with the standard. Cap the sample
cell and let it stand for one minute. The standard is now ready for
use in the calibration procedure, Section 3.6.3.
3.6.1.3 Preparing StablCal Stabilized Standards in Sealed Vials
Sealed vials that have been sitting undisturbed for longer than a month
must be shaken to break the condensed suspension into its original
particle size. Start at step 1 for these standards. If the standards are used
on at least a weekly interval, start at step 3
Important Note: These instructions do not apply to <0.1-NTU* StablCal
Standards; <0.1NTU StablCal Standards should not be shaken or inverted.
1. Shake the standard vigorously for 2-3 minutes to resuspend
any particles.
2. Allow the standard to stand undisturbed for 5 minutes.
3. Gently invert the vial of StablCal 5 to 7 times.
4. Prepare the vial for measurement using traditional preparation
techniques. This usually consists of oiling the vial (see
Section 2.3.2 on page 23) and marking the vial to maintain the same
orientation in the sample cell compartment (see Section 2.3.3 on
page 24). This step will eliminate any optical variations in the
sample vial.
5. Let the vial stand for one minute. The standard is now ready for use
in the calibration procedure, Section 3.6.3.
To Next Page
Loading...
Need help?
General
