Waters Advanced Purification Glass Columns - Manual (Page 6)

[ Care and Use ManUal ]
Waters Advanced Purification Columns 6
III. Care and maIntenanCe
a. Troubleshooting
Table 2: Troubleshooting the AP Column
b. Replacing Ferrules
Each of the four tubing connections on the AP column uses a gripper
ring between two washers (to keep the Tefzel tubing from sliding
when the column is under pressure) and a ferrule. This section
explains how to set the gripper ring and replace a ferrule on the AP
column.
Installing the Ferrule, gripper ring, and washer assembly
To install a new ferrule, gripper ring, and washer (Figure 5):
1. Slide a washer over the end of the tubing.
2. Place a gripper ring in the depression on the gripper ring tool.
3. Insert the end of the tubing into the gripper ring tool as far as it will go
(see Figure 5). This seats the gripper ring at the proper distance from
the end.
4. Withdraw the tubing from the gripper ring tool and slide another washer
over the end of the tubing.
5. Slide the ferrule over the end of the tubing, flared end first.
Use l/I6-inch o.d., 0.009-inch i.d. Tefzel tubing for all connections.
Figure 5: Using the Gripper Ring Tool
c. Disassembling and Reassembling the Inlet Connector
To replace the ferrule at the connection between the inlet connector
and the column, you must first disassemble the inlet connector
assembly.
Disassembling the inlet connector
To disassemble the inlet connector assembly:
1. Deactivate the O-ring by turning the seal adjustment knob.
2. Move the slide to the coarse adjustment position and unscrew the
plunger.
3. Use a screwdriver to remove the O-ring located under the cover.
4. Unscrew the seal adjustment knob, exposing the set screw that holds
the core in the proper orientation. Use the Allen wrench from the Spare
Parts Kit to remove the set screw.
5. Push the core out of the plunger and unscrew the inlet connector tip.
6. Pull out the tubing. Use a single-edge razor to cut the tubing above
the washers. To replace the ferrule, follow the procedure in “Replacing
Ferrules”.
Reassembling the inlet connector
To reassemble the inlet connector:
1. Insert the end of the tubing and the ferrule into the inlet connector tip.
Then slide the core over the tubing and screw it to the tip. Hand-tighten
the fitting.
2. Slide the plunger over the core and replace the set screw. The plunger
core has three slots and the plastic plunger has two threaded holes.
There is only one perfect match. Position the hex of the inlet con-
nector tip to align onwe of the slots with one of the threaded holes.
If there is no perfect match, tighten the inlet connector tip a little more.
Symptom Possible Cause Corrective Action
Poor resolution Sample overload Reduce sample amount.
Flow rate too high Reduce flow rate.
Packed bed void Adjust inlet connector to
eliminate void.
High
backpressure Plugged filter Replace the filter (see “Replacing
Filters and O-rings”).
Leakage into
plastic shield
or out of inlet
connector Foreign matter on
sealing surfaces Clean surfaces and re-tighten.
O-ring seal is not
activated Turn seal adjustment nut counter-
clockwise to active O-ring.
Damaged O-rings Replace O-rings (see “Replacing
Filters and O-rings”).
Gripper ring Gripper ring tool
Washer
Ferrule Washer