YSI 5200 - Manual (Page 66)

YSI Incorporated 64 5200 Recirculating System Monitor
S a l i n i t y
3 0 p p t
NOTE: The instrument must be on for at least 20 minutes to polarize the DO sensor before
calibrating.
% S A T
E n t e r t o S e l e c t
3. Select % Saturation.
4. Place approximately 3 mm (1/8 inch) of water in the bottom of the calibration/storage cup.
5. Place the probe module into the calibration/storage cup.
NOTE: Make sure that the DO and temperature sensors are not immersed in the water.
6. Engage only 1 or 2 threads of the calibration/storage cup to ensure the DO sensor is vented to the
atmosphere.
7. Enter the current altitude in feet (rounded to the nearest 100 feet).
A l t ( X 1 0 0 f e e t )
0 0 8
The current DO reading and calibration setting are displayed, along with a message on the bottom
line of the screen.
D O 8 7 . 2 % C a l = 9 7 . 4
W a i t t i l S t a b l e
8. Allow approximately ten minutes for the air in the calibration/storage cup to become water
saturated and for the temperature to equilibrate before proceeding.
9. Observe the DO reading. When the reading shows no significant change for approximately 30
seconds, press the Enter [  ] key. After a short pause, the display will return to the DO System
menu.
NOTE: You may enter one of the other DO System menus (Set Point, Control, Alarm or Setup
menu), but your calibration changes are not saved until you exit the DO System menu as
described below.
10. Press the [ ESC ] key to exit the DO System menu. You will be prompted to save your changes.
C a l i b r a t i o n
S a v e ? Y e s
11. Press the Enter [  ] key to save the new calibration value, or press the [e] or [f] key to select
No, then press the Enter [  ] key to exit without saving any changes.
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 reading from a recently calibrated handheld DO probe in the immediate
vicinity of the 5200 probe module or from a Winkler titration).
1. Go to the DO calibrate screen as described in Section 6.2.1 Accessing the Calibrate Screen.