YSI ProDSS Meter Calibration and Maintenance
K:\Streamkeepers\Monitoring\Eqpt & supplies\Calibration-Maintenance\SOPs\YSI ProDSS maint-
cal SOP's
14
to the first fill line (170 mL).
11.
Select Calibration Value and enter
124 FNU
12.
Confirm stabilization by watching the
actual readings
on the screen, if there has been little
change to the actual readings in ~40 seconds, the sensor is stable.
13.
After observing stabilization, press Accept Calibration. “Ready for cal point 3” will be
displayed in the message area, select Finish Calibration.
14.
Rinse the sensors and calibration cup with distilled or clean tap water and proceed to
dissolved oxygen calibration
POST-SEASON CALIBRATION CHECK AND QUALITY CONTROL:
At the end of each monitoring season, re-check the integrity of the meter by testing with the YSI
turbidity standard. It must meet the control limits in Streamkeepers’ Quality Assurance Project
Plan: the readings on the meter need to be within ± 0.5 or 5% of the value of the fresh primary
standard. If the meter performs outside the limits, all data from the previous monitoring season
that falls within that range must be flagged an “estimate” (“Q” in Streamkeepers’ flagging
system, and “J” or one of its variants in the WA Dept. of Ecology’s flagging system). And if the
meter does not perform to ± 1.0 or 10% of the standard value, all data from the previous
monitoring season that falls within that range must be flagged as “rejected” (“U” in
Streamkeepers’ flagging system, and “REJ” in the WA Dept. of Ecology’s flagging system).
TURBIDIMETER CALIBRATION PROTOCOL & DATA SHEETS NOTEBOOK:
Record all calibration, quality-control, and maintenance activity in the Turbidimeter Calibration
Protocol & Data Sheets notebook.
You are responsible for entering all maintenance and calibration data into the database.
Dissolved Oxygen Calibration
DO calibration is done in the lab just prior to, and, at the end of each sampling event. The
ProDSS’s ODO sensor measures dissolved oxygen % saturation and dissolved oxygen in mg/L.
DO calibration is dependent on the barometer, confirm that the barometer is reading “true”
atmospheric pressure, and not corrected pressure. The following must be done before and after
each month long sampling session:
Pre Monitoring Session:
•
Confirm DO sensor is clean
•
DO zero-point calibration
•
DO calibration
•
DO calibration check (Winkler side-by-side)
Post Monitoring Session:
•
DO drift check (Winkler side-by-side)
