Hach-Lange STABLCAL - Manual (Page 10)

10
STABLCAL Stabilized Formazin Turbidity Standards
GB
For Infrequently Used StablCal Standards
Bulk solution (bottles) or sealed sample cell (vials) standards
These instructions apply to standards that have been sitting undisturbed for more
than one week or to new standards received from the manufacturer.
Note: These instructions apply to all StablCal Standards except the < 0.1 NTU
StablCal Solution (Cat. No. 26597). If you are using the < 0.1 NTU StablCal
Solution, follow the instructions on page 11.
For bulk solution standards:
1. Before breaking the seal on the bottle, invert the standard repeatedly for
2 – 3 minutes. This breaks up the condensed suspension into the original
particle size.
2. Let the standard sit undisturbed for 5 minutes.
3. Invert two or three times before pouring the standard into a clean sample cell.
Rinse the sample cell at least once with the bulk standard.
4. Eliminate any optical variances on the sample cell by using traditional preparation
techniques (oiling and indexing the sample cell).
5. Fill the sample cell with the standard; cap the sample cell and the bulk solution.
For bulk solution and sealed sample cell standards:
6. Slowly invert the sample cell 2 – 3 times; let the sample sit undisturbed for
2 – 3 minutes.
7. The sample cell containing the standard is now ready for measurement.
For Frequently Used StablCal Standards
Bulk solution (bottles) or sealed sample cell (vials) standards
These instructions apply to frequently used standards (daily or weekly usage).
Note: These instructions apply to all StablCal Standards except the < 0.1 NTU
StablCal Solution (Cat. No. 26597). If you are using the < 0.1 NTU StablCal
Solution, follow the instructions on page 11.
For bulk solution standards:
1. Invert the standard 10 times to mix.
2. Eliminate any optical variances on the sample cell by using traditional preparation
techniques (oiling and indexing the sample cell).
3. Invert two or three times before pouring the standard into the sample cell. Rinse
the sample cell at least once with the bulk standard solution.
4. Fill and cap the sample cell.
For bulk solution and sample cell standards:
5. Let the sample cell sit undisturbed for 2 – 3 minutes.
6. The sample cell containing the standard is now ready for measurement.