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Sensors, Calibration, and Maintenance
Conductivity Calibration
Select the appropriate calibration standard for the conductivity of the sampling
environment. Standards at least 1 mS/cm (1000 s/cm) are recommended for the
greatest stability. For fresh water applications, calibrate to 1,000. For saltwater
applications, calibrate to 50,000 S.'
1.
Make sure the conductivity sensor is clean prior to calibration. If necessary,
clean the conductivity cell with the supplied soft brush.
2.
Place the correct amount of conductivity standard into a clean and dry or
pre-rinsed calibration cup.
3.
Carefully immerse the sensor into the solution. Make sure the solution is
above the vent holes on the side of the conductivity sensor.
4.
Gently rotate and/or move the sensor up and down to remove any
bubbles from the conductivity cell. Allow at least 40 seconds for
temperature equilibration before proceeding.
5.
Cal
key, select Conductivity, then select Specific Conductance.
Push the
6.
Select Calibration value then enter the calibration value of the standard
used. Note the measurement units the instrument is reporting and
calibrating and be sure to enter in the correct calibration value for the
units being used. For example, 10,000 S = 10 mS. Make sure that the
units are correct and match the units displayed on the handheld.
7.
Observe the actual measurement readings for stability (white line on
graph shows no significant change for 40 seconds), then select Accept
Calibration. "Calibration successful!" will be displayed in the message
area.
8.
Rinse the sensor in clean water then dry.
NOTE:
If the data is not stabilized after 40 seconds, gently rotate the
sensor or remove/reinstall the calibration cup to make sure that no
air bubbles are in the conductivity cell.
If you get calibration error messages, check for proper sensor
immersion, verify the calibration solutions is fresh, the correct
value has been entered into the handheld, and/or try cleaning the
sensor.
Conductivity Sensor Maintenance
The conductivity channels should be cleaned after each use. Dip the sensor's
cleaning brush (included with the maintenance kit) in clean water, insert the brush
at the top of the channels, and sweep the channels 15 to 20 times.
If deposits have formed on the electrodes, use a mild solution of dish soap and
water to brush the channels. For heavy deposits, soak the sensor in white vinegar,
then scrub with the cleaning brush. Rinse the channels with clean water following
the sweepings or soak.
The ProDSS sensor can be stored wet or dry. For long-term storage, YSI
recommends storing the sensor dry.
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