YSI ProDSS Meter Calibration and Maintenance
K:\Streamkeepers\Monitoring\Eqpt & supplies\Calibration-Maintenance\SOPs\YSI ProDSS maint-
cal SOP's
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CALIBRATION
These procedures are to be performed by Streamkeepers staff or trained volunteers. Calibrate all
parameters before every quarterly monitoring season. If the instrument is used between seasonal
sampling months, additional checking is recommended. Be sure the primary reference standards
used in the office for calibration are within their expiration dates (last day of listed month), The
YSI ProDSS will automatically store calibration information into a GLP file (good lab practices).
This includes what was calibrated, who calibrated it, and when it was calibrated.
To prevent contamination, always calibrate the sensors in the following order:
Barometer (if necessary), conductivity, pH, turbidity, dissolved oxygen
Pre-sensor calibration:
•
Make sure all sensors, sensor guard, and calibration cup are clean. For proper cleaning
procedures, see the
Maintenance
section below. Make sure the sensor guard is in place
before installing the calibration cup.
•
Fill the calibration cup with a moderate amount of water and rinse the sensor guard and
sensors by gently shaking the sealed cup.
•
Discharge the water and repeat if necessary
•
Below is a schematic of the calibration cup (note the different fill lines), and a picture of the
sensor tips. You may need to reference this image during calibration.
Temperature sensor
