YSI ProDSS Meter Calibration and Maintenance
K:\Streamkeepers\Monitoring\Eqpt & supplies\Calibration-Maintenance\SOPs\YSI ProDSS maint-
cal SOP's
8
CHECKING PRIOR CALIBRATION STABILITY:
1.
Record the date, your initials, season, and conductivity standard strength on the conductivity
calibration data sheet.
2.
Thoroughly rinse the calibration cup with a small amount of conductivity standard solution
and then discard.
3.
Fill the pre-rinsed calibration cup with the conductivity solution to the second fill line (225
mL)
4.
Carefully immerse the sensors (with sensor guard on) into the cup, make sure the solution is
above the vent holes on the side of the conductivity sensor. To remove bubbles, gently rotate
the sensors, or move the sensors up and down. Allow at least one minute for temperature
equilibration.
5.
On the Run Screen check and record the pre-calibration conductivity reading with the probe
in the conductivity solution (make sure it’s in µS/cm, if not see Check
Sensor Readings
above for correction). Record this value in the Pre SP.C column on the data sheet.
6.
Now you will clean the conductivity cells prior to calibration.
Cleaning Procedures
•
Dip the probe into a beaker of mild solution of dish soap and clean tap water. Let it sit for
about 30 seconds.
•
Use the cleaning brush from the maintenance kit to scrub the inside of the chamber; insert in
holes and scrub back and forth about 20-30 times. Rinse the probe in clean tap water
thoroughly.
CALIBRATING SPECIFIC CONDUCTANCE:
1.
Thoroughly rinse the calibration cup with a small amount of conductivity standard solution
and then discard. If any water was used to clean the sensors before calibration, pour
calibration solution over the sensors using solution from the calibration cup rinse
2.
Fill the pre-rinsed calibration cup with the conductivity solution to the second fill line (225
mL)
3.
Carefully immerse the sensors (with sensor guard on) into the cup, make sure the solution is
above the vent holes on the side of the conductivity sensor. To remove bubbles, gently rotate
the sensors, or move the sensors up and down. Allow at least one minute for temperature
equilibration.
4.
Select the
calibration button
, select Conductivity, then select Specific Conductance
5.
Select Calibration Value; enter the calibration value of the calibration solution.
Calibration value should be displayed on the solution bottle, it should read:
“1,000 umhos @25°C”
Note:
umhos = µS/cm
6.
Confirm stabilization by watching the
actual readings
on the screen, if µS/Cm has not
significantly changed in 40 seconds, the sensor is stable.
7.
After observing stabilization, press Accept Calibration. A message will appear: “Calibration
Successful”.
