Technical data

32
2.2. Autosampler, FRL 724
7-, 8- or 14-channel Autosampler with in-
tegrated valves
The 7-channel FRL 724 – with one solenoid
3-way-valve per channel and x/y-driven sam-
pling arm – was designed for silent operation
and maximum corrosion resistance in combina-
tion with either the peristaltic- or piston pump
for “stirrer type” dissolution testers as well as in
combination with an USP 4 Offline system.
To archive silent operation as well as corrosion
resistance, the unit is mainly made from corro-
sion free materials such as alloy and plastics
and features a gentle and precise spindle drive.
The integrated 3-way solenoid valves, in com-
bination with a “stirrer-type” dissolution system
allow accurate dosing (± 0.5 ml) when using
peristaltic- or piston pump. The medium is
pumped in a close loop from the vessel back to
the vessel until the tubing is completely filled
and only then the valve switched to collect the
sample into glass tubes or HPLC vials.
In combination with an USP 4 “Flow-Through-
Cell” Offline System the 3-way-valves operate
as a “splitter” to collect an average of the flow-
through. The spindle drive, especially with USP
4 systems, is a big advantage since the arm of
the Autosampler can be precisely moved from
row to row without returning to the zero-position
in between.
The alloy rack-holder is made to carry various
racks (glass tubes of 10 ml and 25 ml capacity
as well as HPLC vials of 1.5 ml and 4.0 ml
maximum volume) to store max. 25 sampling
intervals of 8 vessels or 12 sampling intervals of
14 test stations (FRL 724-2 version to operate
with DT 1420). For temperature sensitive sam-
ples a cooled rack for HPLC vials is available.
HPLC membrane piercing is realised by using a
2
nd
spindle drive of the y-axis of the sampling
arm. The high-torque gear allows piercing of
either split- or even none-split septum.
The medium replacement (if equipped) is per-
formed by a 2-part container of which the re-
placement media section is constantly refilled
by two 1-channel peristaltic pumps from an
external heated or unheated flask. This feature
permits a) nearly unlimited amount of replace-
ment media and b) sucking from a heated con-
tainer not to lower the media temperature inside
the test station by cold replacement media.
15-207-2000
 Additional price 8-channel version, FRL 824
15-208-2000
 Additional price 14-channel version,
FRL 724-2 15-214-2000
 Additional price media replacement (incl. two
1-channel peristaltic pumps, 2-part acrylic
glass container and replacement routine)
15-208-x1xx
 Additional price for Titanium filling tubes
(instead 316 stainless steel); for FRL 724
15-207-xx1x
 Additional price for Titanium filling tubes
(instead 316 stainless steel); for FRL 824
15-208-xx1x
 Additional price for Titanium filling tubes
(instead 316 stainless steel); for FRL 724-2
15-214-xx1x