Oyster-10, V1.9 11/09
7
Maintenance and Troubleshooting
Electrode Cleaning
The type of electrode coating that occurs over time will determine the cleaning method.
Soft coatings can be removed by vigorous stirring or by using a squirt bottle. Organic
chemical coating (hard coatings) should be chemically removed. Only in extreme cases
should the bulb be cleaned mechanically.
Battery Replacement
Install a new battery when the low battery indicator appears on the LCD. Remove the
battery cover, install a new 9V battery, and replace the battery cover.
Troubleshooting the Meter
Meters are the least likely cause of pH measurement problems. To rule out the meter
check the following:
1. Check the 9V battery and replace it if necessary.
2. When using the AC adaptor for power, check that the line cord is firmly connected to
the meter.
3. Replace the existing electrode connector with optional BNC shorting plug (shorts the
ground ring to the center pin of the meter’s BNC jack) and check the following:
a) Set the measurement mode to pH. The LCD reading should be stable.
b) Adjust the calibration control for an LCD reading of 7.00.
c) Change to the mV measurement mode. The LCD should read 0 mV.
d) Note that an out of range reading is indicated by dashes ( -------).
