Sensor PartsFigure 12-2:
3. Hold the sensor over a container with the cathode pointing down.
4.
Remove the fill plug.
5. Allow the electrolyte solution to drain out.
6. Remove the old pipe tape from the plug.
7. Wrap the plug with two turns of pipe tape and set aside..
8. Prepare a new membrane.
a. Hold the membrane assembly with the cup formed by the membrane and
membrane holder pointing up.
b. Fill the cup with electrolyte solution.
c. Set it aside.
9. Hold the sensor at about a 45° angle with the cathode end pointing up.
10. Add electrolyte solution (PN 9210438) through the fill hole until the liquid
overflows.
11. Tap the sensor near the threads to release trapped air bubbles.
12. Add more electrolyte solution if necessary.
13. Place the fill plug in the electrolyte port and begin screwing it in.
14. After several threads have engaged, rotate the sensor so that the cathode is
pointing up and continue tightening the fill plug.
Do not overtighten.
15. Place a new O-ring in the groove around the cathode post.
16. Cover the holes at the base of the cathode stem with several drops of electrolyte
solution.
17. Insert a small blunt probe, like a toothpick with the end cut off, through the pressure
equalizing port.
See Figure 12-2.
Maintenance
56 Rosemount TCL