YSI 556 MPS - Manual (Page 49)

Calibrate Section 6
YSI Incorporated YSI 556 MPS Page 43
9. Observe the reading under DO %. When the reading 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. See Figure
6.6 Calibrated.
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.
DO Calibration in mg/L
DO calibration in mg/L is carried out in a water sample which has a known
concentration of dissolved oxygen (usually determined by a Winkler
titration).
1. Go to the DO calibrate screen as described in Section 6.2.3
Dissolved Oxygen Calibration, steps 1 through 3.
2. Use the arrow keys to highlight the DO mg/L selection.
3. Press Enter. The DO mg/L Entry Screen is displayed.