YSI ADV6600 - Manual (Page 62)

Section 4. Calibration and Diagnostics
ADV6600
Y S I
Environmental
Page 52
mg/L Calibration in a Known Solution:
1. Determine a known DO concentration of a water sample by performing a Winkler Titration.
2. Place the correct amount of the known sample into the calibration cup with the assembly in the
upright position. Allow at least 1 minute for temperature equilibration before proceeding.
3. Select Dissolved Oxy.
4. Select 2-DO mg/L.
5. The screen will prompt you to enter the value of the known sample.
6. Press Enter, and the calibration will automatically occur after a preset warm-up period of 60
seconds, followed by a message indicating that the DO calibration is complete.
7. Press Enter again to return to the Calibrate menu.
4-6.4. Dissolved Oxygen for Spot Sampling Studies
NOTE CAREFULLY: Before beginning the calibration of dissolved oxygen for spot sampling
studies, first assure that the Sample Interval and the Averaging Interval are set to the same value
(usually 1 minute) in the Quick Setup box of ADVantage6000 and that the Autosleep RS232
selection in the Advanced|Setup menu associated with the Water Quality firmware is INACTIVE.
To calibrate the dissolved oxygen sensor for spot sampling studies, follow the exact procedures
outlined above in Section 4-5.3 for % Saturation and mg/L modes. However, with Autosleep
RS232 deactivated as directed above, the calibration will NOT occur automatically as outlined
above for monitoring studies. Instead, the user should observe the DO readings in real time when
they show no change for approximately 30 seconds, press Enter to confirm the calibration manually
as is done for all other sensors.
4-6.5. pH
NOTE: When calibrating pH, remove ISE modules (ammonium, nitrate, and chloride) from
the sonde bulkhead. After pH calibration is complete, replace the ISE sensors and proceed
with their calibration. Exposure to the high ionic content of pH buffers can cause a
temporary, but significant, perturbation of these ISE probes.
When selecting to calibrate pH, you will be given the choice of a 1-point, 2-point, or 3-point
calibration.