Operating Instructions UVD 170S/340S
21
6.3.2 Flow Cell Removal
•
If the
UVD 170S/340S
is still connected to the data system, first terminate communication
using the Disconnect command in CHROMELEON
TM
(
→
CHROMELEON
TM
manual).
•
Switch off the detector. Disconnect the power cord.
•
Open and remove the side panel. Do not bend the Teflon capillary.
•
Undo the 4 retaining screws and remove the flow cell cover.
•
Undo the knurled flow cell retaining screw and carefully draw out the flow cell assembly.
Warning:
During operation, the lamp becomes extremely hot and remains so for
some time after the unit is switched off. Therefore, to avoid possible
injury, always allow sufficient time for lamp cooling before attempting
any maintenance.
6.3.3 Flow Cell Replacement
Important:
The flow cells of the detectors
UVD 170S/340S
and
UVD 160S/320S
are
not
interchangeable.
•
Insert the new/cleaned flow cell, aligning the notch with the alignment pin of the mounting.
No
further alignment is necessary.
•
Replace the flow cell cover.
•
Replace the side panel.
•
The detector may now be switched on and communication with CHROMELEON
TM
restored using the Connect command.
6.3.4 Flow Cell Cleaning
Important:
In contrast to the other flow cell versions,
it is
not possible
to
disassemble the micro flow cell for cleaning. Clean the micro flow cell
by flushing with 0.2M nitric acid, followed by water and methanol.
To clean the flow cell (except the micro flow cell), proceed as described below. The numbers
in parentheses refer to the corresponding parts as illustrated in fig. 7:
•
Undo and remove screws (1) and remove the heat exchanger (2).
•
Undo and remove screws (5) and carefully remove the lens-retaining plates (6 and 9) and
lenses (7).
•
To avoid scratching the lenses, these should be placed on a clean, lint-free cloth or tissue.
•
Clean the lenses using a soft, lint-free cloth or tissue and an optical cleaning solution.
•
Scratched or damaged lenses must be replaced.
Important:
Do not
attempt to remove the flow cell body (8) from its housing (10)!
•
Cleaning of the flow cell body together with its housing may be carried out by rinsing with
water, iso-propanol or methanol or by placing the entire assembly into an ultrasonic bath.
