Replace the Injection Loop
- Ensure that no heat is being applied to the analyzer. If necessary, enable manual control and set the target temperature for the heat zones to ambient. Wait for the analyzer to cool.
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Press in on the right side of the retractable handle on the top of the analyzer to protrude the handle. Use the handle to open the hinged top panel. It is not necessary to remove the top panel. Pull down the upper front panel.
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Depending upon the state of the analyzer, the internal components may be hot. Use caution. |
- The Fill/Inject (Loop) valve cover is held in place by two retaining plungers. Remove the valve cover by pulling the plungers outward until the Fill/Inject valve cover is released. Pull the cover up and out.
- Remove the insulation from Fill/Inject valve.
- Unscrew the loop nut and lay it aside. It may be necessary to loosen the screw in the middle of the assembly in order to free the loop nut.
- Remove the enclosure ring.
- Use a 1/4 in. open-end wrench to loosen the nuts on the injection loop.
- Pull up and remove the injection loop and enclosure ring from the mounting plate.
Ensure the body of the loop is positioned in the temperature-controlled enclosure of the loop valve. This orientation keeps the temperature (and volume) of the loop constant. Failure to keep the full loop at a constant temperature may cause variations in the quantity of gas contained in the loop. |
- Install the replacement injection loop by placing the ends of the loop into the sides of the valve and turning the nuts finger-tight.
- Push the replacement loop down to contact the mounting plate and place the loop enclosure ring firmly into place.
- Screw the loop nut down finger-tight. Tighten the screw in middle of the assembly if it was loosened earlier.
- Tighten the loop nuts securely, using a 1/4 in. open-end wrench.
- Check the injection loop for leaks. If a leak is detected, the injection loop is probably not installed properly. Repeat the installation and check for leaks again. See Perform a Leak Test.
- After checking for leaks, move the insulation back into position and reinstall the Fill/Inject valve cover.
- Close the top panel and the lower front panel.
- After installing a new injection loop, the loop must be calibrated. Go to Unit [n] > Unit Configuration to update the loop volume.
The smaller loops connect to the same openings in the valve, but rest in a different position than the larger loop. |
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