40
Conductivity Sensor Maintenance
The openings that allow sample access to the conductivity electrodes should be cleaned regularly. The small cleaning brush
included in the Maintenance Kit is ideal for this purpose. Dip the brush in clean water and insert it into each hole 10 to 12 times.
In the event that deposits have formed on the electrodes, it may be necessary to use a mild detergent (laboratory grade soap or
bathroom foaming tile cleaner) with the brush. Rinse thoroughly with clean water, then check the response and accuracy of the
conductivity cell with a calibration standard.
Temperature Sensor Maintenance
You must keep the temperature portion of the sensor free of buildup. Other than that, the sensor requires no maintenance. The
conductivity cleaning brush can be used to scrub the temperature sensor if needed. Alternatively, you can use a toothbrush to clean
the sensor.
pH, ORP, and pH/ORP Sensor Maintenance
Chemical cleaning is required whenever deposits or contaminants appear on the glass and/or platinum surfaces or when the
sensor’s response slows. Removing the sensor from the cable may make cleaning easier.
To chemically clean the sensor:
1.
Soak the sensor for 10-15 minutes in clean water containing a few drops of commercial dishwashing liquid.
2.
Rinse the sensor in clean water.
If good pH and/or ORP response is still not restored, perform the follwing additional procedurer:
1.
Soak the sensor for 30-60 minutes in one molar (1 M) hydrochloric acid (HCl). This reagent can be purchased from most lab
supply distributors. Be sure to follow the safety instructions included with the acid.
2.
Rinse the sensor in clean water.
If this procedure is unsuccessful, as indicated by improper electrode performance, contact YSI Technical Support or
the Authorized dealer where you purchased the instrument.
Typical working life for pH and ORP sensors is approximately 12-24 months depending on usage, storage, and
maintenance. Proper storage and maintenance generally extends the sensor’s working life.
CAUTION:
It is not recommended to perform any mechanical cleaning (e.g. scrubbing), as this can permanently
damage the glass bulb.
A
