YSI ProDSS Meter Calibration and Maintenance
K:\Streamkeepers\Monitoring\Eqpt & supplies\Calibration-Maintenance\SOPs\YSI ProDSS maint-
cal SOP's
12
calibration and you will have to start over again with the pH calibration.
Setting the upper point (pH buffer 10)
1.
Rinse sensors once with distilled water, once with old buffer solution, and twice with new
solution. To rinse, fill cup ~2”, attach cup to unit and lightly shake the unit while tilting it
back and forth. Shake and tilt the unit until all sensors and guard have been rinsed.
2.
Fill the calibration cup with buffer 10 solution to the
first
fill line (170 mL)
3.
Carefully immerse the unit into the calibration cup, allow at least one minute for temperature
stabilization.
4.
Check for any air bubbles on the sensor tip, if any are present, tap the side of the unit until
the bubbles are removed.
5.
Observe the mV and wait for stabilization (doesn’t vary by more than 0.01 for 2 min.), record
value on data sheet.
6.
Enter the pH calibration value that corresponds to the buffer temperature reading (value may
be located on pH buffer bottle)
7.
Confirm stabilization by watching the
actual readings
on the screen, if pH remains within ±
0.01 for 2 minutes, the sensor is stable.
8.
After observing stabilization, press Accept Calibration. Select Finish Calibration and
proceed to the next calibration parameter.
9.
Rinse the sensors and calibration cup with clean water and proceed to turbidity calibration.
The date and time of calibration will be stored in the GLP file. For sensor storage, refer to the
Short Term Storage
or
Long Term Storage
sections below.
Calibration troubleshooting:
To be continued
☺
Always check amounts and dates for all pH buffer solutions to ensure there is
enough for the next calibration check. If not, notify staff.
Once you have finished calibrating the equipment, YOU are responsible for
entering the new data into the database. Once the data has been entered, the
database will automatically tell you if the instruments have passed their
quality control criteria. Print this report and staple it to the front of the data
sheet, 3-hole punch these pages and place them in the back of the calibration
notebook behind the data sheet tab. Put the most recent data sheet on top.
