Pyxis SP-350 - High Color and Turbidity Warning; Calibration; PTSA Calibration (Two-Point with Zero)

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NOTE
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The me required to reach a stable reading may be slightly longer if the water
sample temperature is signicantly dierent than the environmental temperature at which
the SP-350 had been equilibrated (stored).
6.2 High Color and Turbidity Warning
The SP-350 has extra channels to measure sample turbidity and color to automacally compensate sam-
ple color and turbidity interference. If sample turbidity and color values determined are too high, a PTSA
measurement warning will be displayed. In such a case, the user should lter the sample for PTSA mea-
surement.
7 Calibraon
7.1 PTSA Calibraon (Two-Point with Zero)
1. Rinse the sample cell three mes with DI water. Fill the sample cell with DI water.
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NOTE
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In emergency, “non-PTSA” water, such as city water, may be used, but re-
calibrate using DI water for the zero step as soon as it is available.
2. Power on the SP-350 by pressing . Allow 5–10 seconds for the SP-350 to stabilize.
3. The unit is acvely reading and displaying PTSA. The values will be very low if DI water is used; PTSA
value should be near zero. A low non-zero value (e.g. 0.2 or 0.4, etc.) is not problemac.
4. Press P-Cal ( or ) to launch the PTSA CALIBRATION screen (Figure 3).
5. Press Zero ( ) to start the zero (blank) calibraon.
6. If the calibraon succeeds, a checkmark ( ) and instrucons for the slope calibraon will appear
(Figure 4).
7. Rinse the sample cell three mes with the desired PTSA standard. Fill the sample cell with the desired
PTSA standard.
8. Press Cycle ( ) to cycle between the PTSA standards 100, 200, and 300 ppb (it repeats). Ensure
the value selected matches the desired PTSA standard in the sample cell.
9. Press Slope ( ) to start the slope calibraon.
10. If the calibraon succeeds, a checkmark ( ), a ”Calibraon Success” message will appear (Figure
5). Otherwise, a warning message is displayed.
11. Calibraon is now complete. Press Exit ( ) to return to measurement mode.
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NOTE
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If Exit is pressed before the second checkmark appears, the calibraon will
not be completed and must be re-done.
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