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Maintenance
6.2.1 Replacing the Standard Cell Solution and Salt Bridge
If calibration cannot be attained, rejuvenate the sensor by replacing its standard cell
solution and salt bridge as shown in Figure 22. If calibration is still not possible, refer to
Section 7 on page 37.
1. To remove the salt bridge, hold the sensor upright (electrode at top), and use pliers or
a similar tool to turn it counterclockwise. Take care not to damage the protruding
process electrode. Properly discard the old salt bridge.
2. Replace the standard cell solution in the sensor reservoir.
a. Pour out the aged solution, and thoroughly flush the reservoir with standard cell
solution.
b. Fill the reservoir to the bottom of the salt bridge mating threads with fresh
standard cell solution (Cat. No. 25M1A1025-115).
3. Carefully thread the new salt bridge clockwise until it is finger-tight and the bottom
surface of the salt bridge is in full contact with the top surface of the sensor body.
Tighten the salt bridge another ½ turn with the wrench or tool.
Figure 22 Replacing Standard Cell Solution and Salt Bridge
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