Technical data

45
“POWER” Kit
The dosing-by-valves “POWER” Kit represents
the high-end ERWEKA Offline Kit which offers
features such as membrane filtration from as
low as 0.22 µm, precision dosing (better ± 0.5
ml without regular pump-channel calibra-
tion/adjustment) and extremely short sampling
intervals (from 2 minutes).
The system collects into glass tubes (10 ml/25
ml) or sealed/unsealed HPLC vials (1.5 ml/4.0
ml) and offers accurate media replacement as
well as HPLC membrane piercing. The system
comprises of:
1.) Fully USP/EP compliant sampling station
with automatic sample withdraw height ad-
justment and 7 stainless steel (316) sam-
ple withdraw tubes
2.) 7-channel, valve-free piston pump with
Teflon/Ceramic pump-heads
3.) FRL 724 7-channel “silent” Autosampler
with 7x 3-way-valves and x/y driven arm in
“corrosion reduced design” for collection of
up to 25 sampling intervals into 10 ml glass
tubes, sealed 1.2/4.0 ml HPLC vials or 17
sampling intervals into 25 ml glass tubes
as well as support arm to hold a rack.
4.) Tubing/Connector Kit, Teflon
5.) System pre-configuration
6.) Upgraded micro-controller for DT 820 se-
ries to control the complete Offline
Not included: DT 820 dissolution tester and
collection rack
Operation principle:
The stainless steel (optional Titanium) sample
withdraw tubes are driven into the media (ex-
actly midway between the top of the media and
the top of the rotating Basket or Paddle) only
while the sample is withdrawn – not to change
the hydrodynamic inside the vessel – as de-
scribed in the USP and EP.
Optional the sample withdraw system can be
equipped with electronic temperature sensors
for each vessel to archive media temperature
documentation for each test-station.
During the sample withdraw tubes are inside
the media the piston pump pumps the media in
a cycle from the vessel through the membrane
filter (optional) through the Autosampler back to
the vessel, until all air inside the tubing system
is removed and the filters are saturated.
Then the 3-way solenoid valves inside the arm
of the FRL 724 Autosampler switch and the
required amount of media is collected in either
glass tubes (10/25 ml) or sealed/unsealed
HPLC vials (1.5/4.0 ml) with an accuracy of
better ± 0.5 ml.
The FRL 724 Autosampler allows storage of up
to 25 (glass tubes of 10 ml-, HPLC vials of 1.5
or 4.0 ml capacity) or 17 (glass tubes of 25 ml
capacity) sampling intervals.
Optionally cooled racks for HPLC vials are
available.
After sample collection the 316 stainless steel
tubes (optionally Titanium) of the Autosampler
drive to and into the replacement media inside
the acrylic glass reservoir which refills after
each media replacement interval automatically
by two integrated 1-channel peristaltic pumps.
The piston pump will transfer the desired vol-
ume to the test-stations to keep the media vol-
ume within the USP/EP specified ± 1% limits.
“POWER” Offline Kit, 7-channel
15-167-0000
(storage/doses into tubes & HPLC vials, media replacement, HPLC vial membrane
piercing, filtration from 0.22 µm)