Replacing Lsiv Seals - Emerson Rosemount Analytical 700XA Manual De Referencia

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Figura 4-13:
700XA después de la extracción de la LSIV (A)

Replacing LSIV seals

Due to the possible damage caused by the presence of solids in the sample stream,
combined with the regular, repeated motion of the injection valve stem, LSIV seals may
require annual replacement.
Nota
Specific application conditions should dictate the frequency of the seals replacement and you should
monitor analytical performance to determine appropriate replacement intervals.
Nota
ID numbers listed in parenthesis refer to "LSIV - Exploded View" in
1.
Halt sample flow and allow time for the LSIV to cool.
2.
Remove the actuation portion (ID No. 26) of the valve by unscrewing the union
coupling (ID No. 19) from the heater section (ID No. 11), which should remain
attached to the GC. A union coupling wrench has been provided for this purpose.
This will expose the sample flow chamber and the old seals that ride the metering
rod (ID No. 25), which should be treated with great care to prevent bending or
scratching.
3.
Pull the sample flow chamber assembly (ID No. 13) off the metering rod. Remove
the two seals (ID No. 14). This may requiring pushing from the opposite side using a
rod smaller than 1/8-inch diameter.
Funcionamiento y mantenimiento
Figura
4-14.
97

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