Hach-Lange 2100P - Portable Turbidimeter Instrument - Manual (Page 20)

Page 20
Calibration
4650098 operation.fm
Section 2, continued
• Store away from direct sunlight. Store vials in their respective kit or shipping box
with the cover in place.
2.3.1.2 Preparing Bulk StablCal Stabilized Standards
Bulk standards that have been sitting undisturbed for longer than a month must be
shaken to break the condensed suspension. Start at step 1 for these standards. If the
standards are used on at least a weekly interval, start at step 3.
Note: When using <0.1-NTU StablCal Standards, do not shake or invert.
1. Shake the standard vigorously for 2–3 minutes to suspend particles.
2. Allow the standard to stand undisturbed for 5 minutes.
3. Gently invert the bottle of StablCal 5 to 7 times.
4. Rinse the sample cell at least once with the standard and discard the rinse.
5. 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 2.3.3 on page 22.
2.3.1.3 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.
Note: When using <0.1-NTU* StablCal Standards do not shake or invert.
1. Shake the standard vigorously for 2–3 minutes to suspend particles.
2. Allow the standard to stand undisturbed for 5 minutes.
3. Gently invert the vial of StablCal 5 to 7 times.
4. Let the vial stand for one minute. The standard is now ready for use in the
calibration procedure, see Calibrating the Turbidimeter on page 21.