GE MOA 280i, Руководство по эксплуатации и обслуживанию

Страница: 138 / 211

GE Analytical Instruments ©2006
12-14
DLM 14291 Rev. A
Septum Replacement
After 50-100 injections, the septum on the purge vessel will need to be replaced.
The best procedure is to replace the septum on a regular basis after a fixed
number of injections. The number of injections will depend on the gauge of the
needle used, and whether the needle is bent or distorted. Large gauge needles or
needles with bent tips will core the septum and require more frequent
replacement than small gauge needles with sharp tips. To some extent the ease of
insertion can be used to tell when it is time to replace the septum. With a new
septum, some force is required to insert the needle, but after many punctures, the
septum loses its integrity and the needle can be inserted without force. To replace
the septum, follow the procedures to open the purge vessel, then remove the old
septum from the screw cap and discard. Install the new septum with the Teflon
side facing the reducing agent. The lifetime of the septum can be extended by
varying the location on the septum when injecting.
Cleaning the Purge Vessel
After running samples, follow the procedure below to clean the purge vessel. By
following this procedure each time the purge vessel is used, clogging of the glass
frit in the purge vessel will be prevented. To clean the purge vessel:
•
Follow the procedures above to drain the reducing agent from the purge vessel.
•
Remove the screw cap on the purge vessel.
•
Use a squeeze bottle filled with deionized water to rinse the purge vessel
several times with water.
•
To clean the condenser, loosen the 1/4" stainless steel nut on the IFD filter line
on the outlet of the purge vessel, and remove the union from the glass. Do not
completely remove the nut from the union, simply loosen the nut and remove
the nut, ferrules and union as a unit.
•
Open the outlet stopcock and use a squeeze bottle to rinse the sides of the
condenser with water.