YSI 556 MPS - Manual (Page 51)

Calibrate Section 6
YSI Incorporated YSI 556 MPS Page 45
7. Stir the water with a stir bar, or by rapidly moving the probe
module, to provide fresh sample to the DO sensor.
8. Allow at least one minute for temperature equilibration before
proceeding. The current values of all enabled sensors will
appear on the screen and will change with time as they
stabilize.
9. Observe the DO mg/L reading, when the reading is stable
(shows no significant change for approximately 30 seconds),
press Enter. The screen will indicate that the calibration has
been accepted and prompt you to press Enter again to
Continue.
10. Press Enter. This returns you to the DO calibration screen.
See Figure 6.7 DO Calibration Screen.
11. Press Escape to return to the calibrate menu. See Figure 6.2
Calibrate Screen.
12. Rinse the probe module and sensors in tap or purified water
and dry.
6.2.4 pH Calibration
1. Go to the calibrate screen as described in Section 6.2.1
Accessing the Calibrate Screen.
2. Use the arrow keys to highlight the pH selection. See Figure
6.2 Calibrate Screen.
3. Press Enter. The pH calibration screen is displayed.