YSI ProDSS Meter Calibration and Maintenance
K:\Streamkeepers\Monitoring\Eqpt & supplies\Calibration-Maintenance\SOPs\YSI ProDSS maint-
cal SOP's
21
Conductivity Sensor
NOTE: Be careful when handling this sensor, the tip has a temperature
sensor that is fragile.
1.
Dip the cleaning brush from the maintenance kit in distilled or clean
tap water, insert the brush at the top of the channels and sweep the
brush back and forth 15-20 times.
2.
If heavy build up has occurred on the electrodes, use a mild solution
of dish soap and clean water. If build up is still present, soak the
sensor in white vinegar and then clean with the brush and a mild
soap and water solution.
3.
Rinse the sensor after cleaning.
4.
Gently pat dry with Kimwipes and proceed to the
Storage
section
below.
pH Sensor
NOTE: pH and pH/ORP sensors require periodic maintenance to clear contamination from the
sensing elements. These contaminants can slow sensor response time. Clean the sensors when
deposits, bio-fouling or other contamination appears on the glass or when the sensor response
time is noticeably slow. Try to avoid using deionized water when cleaning or storing (short
term) the pH sensor, clean tap water will suffice.
DO NOT physically scrub or swab the glass bulb, the bulbs are fragile and can break with a
small amount of force.
1.
Remove the sensor from the bulkhead and soak the end of the sensor in a mild solution of
clean tap water and dish soap in a glass beaker. Soak for ~10 to 15 minutes.
2.
After soaking, rinse with clean tap water and inspect the glass probe, if the probe is visibly
clean then proceed to storage.
3.
If the glass bulb appears to still be dirty, soak the sensor in 1 molar HCl for 30 to 60 minutes,
if HCl is not available, use white vinegar. After soaking in HCl rinse with clean tap water,
then soak the sensor in clean tap water for 60 minutes, stir occasionally.
4.
If dirt or bio-fouling is still present, soak the sensor in a 1:1 dilution of clean tap water and
chlorine bleach for 60 minutes. Rinse the sensor with clean tap water; soak the sensor in
clean tap water for 60 minutes.
5.
Gently pat dry with Kimwipes and proceed to the
Storage
section below.
Turbidity
1.
Clean the sensing window with a non-abrasive, lint-free cloth. Clean the window carefully to
avoid scratches. If necessary, use a mild solution of dish soap and water. Gently pat dry
with Kimwipes and proceed to the
Storage
section below.
Dissolved Oxygen Sensor
ODO sensor caps are
warranted for 1 year
but have a typical working life of 18 to 24 months.
As the ODO sensor caps ages, large scratches in the paint/dye layer and changes in the dye layer
can reduce measurement stability and response time. Periodically inspect the sensor cap for
damage and large scratches in the paint/dye layer. Replace the cap when readings become
