YSI PRO20 - Page 4

IOP 011C.3
Effective Date: 1/09/2017
Page 4 of 6
3. Accessing highlighted options; use the ENTER
◄--- key.
4. Calibration key; Cal, used for calibrating the meter.
5. The menu key, used for accessing the system setup functions.
III. Calibration
A. Ensure that the following is completed before calibrating; the barometer is reading
accurately and the sponge is wet in the probe calibration/sleeve. If the auto shutoff is
already set for 20 minutes or more this section can be skipped.
1. Power the meter on and wait 10 to 15 minutes.
2. The auto shut off timer should be disabled or set to at least 20 minutes.
3. Press Menu on the keypad.
4. Scroll down to Auto Shutoff.
5. Press ENTER
◄--, Time in Minutes will appear.
6. Press ENTER
◄--, This will allow the meter to select the amount of minutes
before meter will shut off.
7. Select the desired amount of minutes by scrolling ▲ up or ▼ down to increase
the minutes or decrease the number of minutes.
8. Press ENTER
◄--, to exit Time in Minutes. The ESC (exit) box will be
highlighted.
9. Press ENTER
◄--, ENTER ◄--, to return to the running screen.
B. One Touch Calibration Method (for % DO). Calibrate the meter in % dissolved oxygen
to insure accuracy in the following steps of section B and C. This method does not let
you see the calibration value to record it.
1. Power the meter on and wait for 10 to 15 minutes, if meter is not already turned
on.
2. Adjust the auto shut off to at least 20 minutes if not already done. See section
3. Calibration can be done by selecting Menu on the key pad.
4. Scroll down, select the One Touch Calibration method.
5. Then scroll down and select ESC box at the bottom of the display by pressing
the Enter
◄--. Skip steps 2, 3, and 4 after configuring the meter for future One
Touch Calibrations.
6. Press and hold the Cal key for three seconds. The words Calibrating % DO will
be displayed.
7. When the calibration is completed, the phrase Calibration Successful will appear
in a highlighted box on the display for a few seconds. Then the instrument will
return to the run screen.