Pyxis SP-380, User Manual

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7 Calibration
7.1 PTSA Calibration (Two-Point with Zero)
1. Rinse the sample cell three times with DI water. Fill the sample cell with DI water.
*
NOTE
*
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-380 by pressing . Allow 5–10 seconds for the SP-380 to stabilize.
3. The unit is actively reading and displaying PTSA. The values will be very low if DI water is used; con-
ductivity value is not critical but PTSA value should be near zero. A low non-zero value (e.g. 0.2 or
0.4, etc.) is not problematic.
4. Press Calib ( ) to launch the PTSA CALIBRATION screen (Figure 4).
5. Press Zero ( ) to start the zero (blank) calibration.
6. If the calibration succeeds, a checkmark ( ) and instructions for the slope calibration will appear
(Figure 5).
7. Rinse the sample cell three times 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 calibration.
10. If the calibration succeeds, a checkmark ( ), a ” Calibration Success ” message will appear (Figure
6). Otherwise, a warning message is displayed.
11. Calibration is now complete. Press Exit ( ) to return to measurement mode.
*
NOTE
*
If Exit is pressed before the second checkmark appears, the calibration will
not be completed and must be re-done.
Figure 4. Figure 5. Figure 6.
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