Cleaning a Sensor Port
If you suspect port contamination, you can clean the port on the cable by filling the port with Isopropyl Alcohol for
30 seconds and then dumping it out. Next, allow the port to air dry completely or blow it out with compressed air.
Installing a sensor into a port that is not completely dry is likely to cause erratic and erroneous readings.
If the connector is corroded, contact your local YSI Representative or a YSI Authorized Service Center.
Verifying Sensor Accuracy and Calibration
Sensor accuracy and calibration can be verified by immersing a sensor into calibration solution or YSI
Confidence Solution
®
. Compare the readings on the Pro Plus display to the value of the solution. If the readings
have drifted more than the accuracy specification of the sensor, perform a calibration before taking field
measurements.
YSI Confidence Solution can be used to check the accuracy and calibration of the conductivity, pH and ORP
sensors. However, to maintain the highest accuracy of the instrument, it should not be used to perform a
calibration.
Resetting a Sensor to Factory Default
Occasionally, it may be necessary to reset the instrument to its factory calibration default values. To reset the
calibration values, press the Cal key
, highlight
Restore Default Cal
and press enter. Highlight the parameter
you wish to reset to default and press enter. Next, you will be asked to confirm the operation. Highlight
Yes
and
press enter to confirm.
Professional Plus Calibration Tips
Rev A
December 2010
26
