Technical data

51
“POWER-14” Kit
The dosing-by-valves “POWER-14” Kit repre-
sents 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 14 stainless steel (316) sam-
ple withdraw tubes
2.) 2x 7-channel, valve-free piston pump with
Teflon/Ceramic pump-heads
3.) FRL 724-2 14-channel “silent” Autosampler
with 14x 3-way-valves and x/y driven arm
in “corrosion reduced design” for collection
of up to 12 sampling intervals into 10 ml
glass tubes, sealed 1.2/4.0 ml HPLC vials
or 8 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 DT 1420i series to control the
complete Offline System, incl. alpha-
numeric keypad, graphic LC display and
product memory
Not included: DT 1420 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while the sample is withdrawn – not to change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 Autosam-
pler back to the vessel, until all air inside the
tubing system is removed.
Then 3-way solenoid valves inside the arm of
the FRL 724-2 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.
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-14” Offline Kit, 14-channel
16-158-0000
(storage/doses into tubes & HPLC vials, media replacement, HPLC vial membrane
piercing, filtration from 0.22 µm)