3. Press the[DOCALI soft-key to enter the manual DO calibration menu. 4. Make sure that the display readings are stable, then use the[UPI, UDOWN] and[DIGIT] soft to enter the calibration value of 0.0% (or 0.00 mg/L)
NOTE: The instrument will not except any value other than zero for the first point ofa two-point calibration.
5. Press[ENTER] to confirm your calibration. The screen will momentarily display"Do CALIBRATION SAVED The Model 5000/5100 is calibrated at two points: the calibration value you select, and its default.
NOTE: When you change the zero calibration point, you offset the other value, so that after zeroing the probe for zero oxygen, you must recalibrate in an oxygen enviromment.
6. You must now recalibrate in en pvvoen environmant(see 1 Dissolved pen Cali