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4909 CPVC Conductivity Cell Insertion/Removal Assembly Operations Manual
12 4909 CPVC Conductivity Cell Insertion/Removal Assembly– Operations Manual 7/99
Allow at least 1/2 inch clearance beyond the end of the cell and 1/8 to 3/16 inch radius clearance
surrounding the cell to permit circulation of the solution.
Avoid locations where excessive temperature changes may occur.
Allow clearance behind the support grip to permit removal of the cell per dimensions in Fig. 3-1 or 3-2.
Locate the insertion/removal assembly on the pressure side of pumps; not the vacuum side.
Avoid locations where the operator must take an awkward position to perform the cell insertion or removal
operation.
The 4909 Insertion/Removal Assembly is designed to support only its own weight. Do not install in
locations where it would be used as a foot rest or where it would be used as a hand grip. Do not hang or
support any other piping or objects from the assembly.
The removal device should not be mounted onto pipelines or vessels displaying excessive vibration unless a
support is provided on the 6” long valve nipple.
3.3 Prepare Assembly
If X7 or 20 are selected in Table IV of the Model Selection Guide, then the 4908 Conductivity Cell (Fig. 1-
4) must be joined with the support tube of the 31074357 Removal Device as discussed in Section 1.3.
Refer to Fig. 1-5.
Initial Prep
1. Loosen compression handle by turning it counterclockwise until it is free from housing.
2. Withdraw the support tube, bushing, washer and handle assembly keeping the bushing and washer in
place on the support tube. When greater insertion depth of the conductivity cell into the process
solution is desired, p/n 074344 Support Tube will give an additional 6 inches immersion beyond the
standard depth. See Figs. 3-1 and 3-2. If 074344 Support Tube is to be used, it must be secured to the
support grip.
3. Slide the bushing and washer off of the standard support tube.
4. Turn the compression handle counterclockwise to remove it from the support grip.
5. Using a strap wrench, loosen and remove the standard support tube.
6. Install 074344 Support Tube by wrapping one end with Teflon tape overlapping by 50% on each wrap.
Wrap the tape in a clockwise direction as viewed from the threaded end of the support tube.
7. Thread this end into the support grip by hand and tighten an additional two turns by using a strap
wrench. Do not use stillson or chain type wrenches as they may damage or score the support tube and
prevent a good seal with the bushing.
8. Replace the compression handle, washer and bushing removed earlier. Note the proper orientation of
the bushing with the tapered surface facing away from the compression handle.
Mounting into the Process
The valve nipples and housing can now be mounted into the process pipeline or tank wall.
1. Remove the protective cap and apply Teflon tape to mounting nipple. Wrap the tape on the threads in a
clockwise direction as viewed from the threaded end. Overlap the tape by 50% on each wrap. Cover
the threaded area twice in this manner.
2. Install the mounting nipple and valve assembly hand tight.