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2009 Nalco Company
5-20
Technical Help
(630) 305-CHEM
3D TRASAR
5500 - Installation & Operation Manual
22. (For one-drum program) My "-a reading" is higher than my "-i reading". Is this
correct? (con’t)
To determine the root cause, perform the following S0940 Check - it verifies fluorometer operation
and helps determine if recalibration is required:
S0940 Diagnostic Data Check (for one-drum and two-drum programs)
:
Steps to run an S0940 calibration check:
1. Turn off Fluorometer inlet shutoff valve and rotate 3-way Fluorometer discharge valve to
sample position.
2. Slowly flush the flow cell with 180 ml of blank solution (DI water.)
Note
: To avoid creating bubbles which affect the accuracy of fluorescence readings,
SLOWLY
draw blank solution into the syringe and
SLOWLY
inject blank solution into the
flow cell.
3. Using a clean syringe, slowly inject the flow cell with 180 ml of calibration solution (P/N 460-
S0940.75) and allow it to remain in the flow cell by leaving the syringe attached.
Note
: To avoid creating bubbles which affect the accuracy of fluorescence readings,
SLOWLY
draw S0940 standard into the syringe and
SLOWLY
inject S0940 standard into the
cell.
4. Go to the controller keypad and select
INFORMATION
,
Diagnostic Data
,
Fluorometer
Data
.
5. Record the values displayed for Prod1, Prod2, Rz, Rs, and Bkgd.
•
Prod 1 should equal PFtra - (PFtra * %TRA bkgd)
•
If 'on-line' tag correction is being used
Prod 2 should equal Pftag
-Where PFtra is the TRASAR product factor, PFtag is the Polymer product factor and
%TRA bkgd is the background TRASAR correction %.
• If 'on-line' tag correction is not being used
Prod2 should equal PFtag - (PFtag * %TAG bkgd),
-Where %TAG bkgd is the background TAG correction %.
• Rz should equal 20
• Rs should equal 40
• Bkgd should equal PFtag
6. If recorded values are close to the results obtained above, the Fluorometer is working
correctly and the calibration is good. Otherwise - recalibrate.
7. Use only DI water for calibration. Do not use make-up or other water source for calibration,
as this will result in an erroneous calibration curve.
If Calibration check is okay, check if the entered background fluorescence is correct. Collect/send
water samples for background analyses if necessary.