Emerson Rosemount MCL-220 Reference Manual page 65

Reference Manual
00809-0100-3414
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. Wrap the plug with several turns of pipe tape and set aside.
7. Prepare a new membrane.
8. Hold the sensor at about a 45° angle with the cathode end pointing up.
9. Add electrolyte solution through the fill hole until the liquid overflows.
10. Tap the sensor near the threads to release trapped air bubbles.
11. Add more electrolyte solution if necessary.
12. Place the fill plug in the electrolyte port and begin screwing it in.
13. After several threads have engaged, rotate the sensor so that the cathode is
14. Place a new O-ring in the groove around the cathode post.
15. Cover the cathode with electrolyte solution; then place the membrane assembly
Rosemount MCL
Figure 8-1: Monochloramine Sensor Parts
A. Membrane retainer
B. Membrane assembly
C. O-ring
D. Cathode
E. Electrolyte fill plug (wrap with pipe tape)
F. Pressure equalizing port
G. Information label
a) Hold the membrane assembly with the cup formed by the membrane and
membrane holder pointing up.
b) Fill the cup with electrolyte solution.
pointing up and continue tightening the fill plug.
Do not overtighten.
over the cathode.
Maintenance
May 2019
65