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4909 CPVC Conductivity Cell Insertion/Removal Assembly Operations Manual
14 4909 CPVC Conductivity Cell Insertion/Removal Assembly– Operations Manual 7/99
3.5 Removal
1. REDUCE PROCESS PRESSURE TO 50 PSIG OR LESS. Shut off purge line, if used. Disconnect
wiring connections if X1 is selected for Table IV in the MSG.
2. DO NOT STAND BEHIND THE TUBE WHEN PERFORMING THIS STEP. While holding the
compression handle from turning, turn the support grip two turns counterclockwise. Loosen the
compression handle until the process pressure pushes the cell and support tube assembly out to its
internal stop. If necessary, pull out by hand until stop is reached.
3. Close the ball valve. If the valve does not close easily, make sure the support tube is pulled all the way
back.
4. Completely loosen the compression handle to withdraw the cell.
3.6 Electrical Connections
The terminal board connections for recorder or analyzer are given in the appropriate directions furnished
with the measuring instrument.
When the cell assembly includes a built-in temperature compensator, all leads are used. The cell is
connected between black and white and the compensator is between red and white, except when MSG Table
III=333. In this case, the built-in temperature compensator is between red and green. See Figs. 5-1 and 5-2
when wiring cells with MSG option=333.
To avoid the possibility of ac pick-up in the cell leads, separate them from all AC line voltage wiring or run
them in a separate grounded conduit.
Cells are available with leadwire up to 20 feet as specified in the MSG assembly. For distances greater than
20 feet, use the required length of cable and a junction box, both listed in Section 4.3. For assemblies
supplied with a Universal Head, Fig. 3-2, a junction box is not required.