Thermo Scientific HESI-II Probe, Руководство пользователя

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4
Maintenance
Replacing the Needle Insert
20 HESI-II Probe User Guide Thermo Scientific
Replacing the Needle Insert
If the metal needle is plugged, you can replace the needle insert. The following procedure
describes how to replace the needle insert.
The needle insert is assembled at the factory and consists of an adjustable union, a needle
guide fitting, a ferrule, an O-ring, an ESI needle, and a metal needle (see
Figure 18 ). The
ferrule is swaged onto the ESI needle. Factory adjusted, the metal needle protrudes 0.5 mm
from the end of the ESI needle (see
Figure 19 ).
Figure 18. Exploded view of the needle insert
Figure 19. Metal needle insert assembly with an enlarged view of the stainless steel needle tip
IMPORTANT
Because the protrusion of the metal needle from the ESI needle is
factory-adjusted, do not disassemble the needle insert.
Needle guide fitting
and ferrule
Metal needle
ESI needle
Adjustable
union
0.5 mm
ESI needle
Metal
needle