PlasmaQuant PQ 9000 (Elite)
Maintenance and care
59
3.
Unscrew the clamping ring from the torch holder and remove
the retaining ring, 2 O-rings and the spacer ring for the gas
line.
4.
Check the sealing rings (O-rings) and renew any worn rings.
5.
Re-install the sealing rings and spacer ring into the lower
opening of the torch holder, observing the following se-
quence:
green O-ring – spacer ring – green O-ring – flat retaining ring
– clamp screw
The spacer ring must be turned so that one of the two bore
holes in the ring is aligned with the small gas inlet opening
(see arrow) in the torch holder.
6.
Push the torch into the holder as far as it will go. At the same
time, turn it so that the gas inlet openings of the torch are
centered in the openings for the gas connection of the holder
(arrows).
7.
Insert the small O-ring into the gas connection.
8.
Screw in the stopper into the gas connection (1).
Caution!
The upper edge of the stopper must be flush with
the upper edge of the holder. Do not screw in any further un-
der any circumstances.
9.
Firmly screw the clamp screw (2) into the holder. To ensure
gas tightness in the lower part of the torch, the gap between
the clamp screw and the holder must not exceed 0.5 mm in
width.
6.2.4
Cleaning the nebulizer
The nebulizer must be cleaned if particles or high concentrations of salt in the samples
have clogged it up. An indicator that the nebulizer has clogged up is increased carrier
gas pressure:
1.
Use
to open the P
LASMA
/
C
ONTROL
window.
2.
Compare the current percentage (pressure) of the C
ARRIER GAS
parameter with the
value achieved after installation of the new or cleaned nebulizer.
3.
Clean the nebulizer as described below if the percentage has increased significantly
(by more than half the original value), at the latest however if 75% is reached.
Wash the nebulizer using the nebulizer cleaning tool. This tool can be ordered from An-
alytik Jena AG.