DESIGNED & OPTIMISED EXCLUSIVELY FOR
LOW TEMPERATURE CELL (C1 & C2)
UNPACKING THE CELL
As supplied you will find in the carrying case :-
- One Cryogenic Dewar Vessel either Model C1 or C2. Note that the shape of these cells
varies depending on the instrument in which they are to be used. Further, the mount
supplied is normally useable in ONE instrument only.
- One Solid sample probe plus heated or unheated probes as ordered, plus tools, spare
tubes etc as appropriate.
C1 Cold Cell
C2 Cold Cell
Unheated - Solids
ALL WORK WITH THIS TYPE OF CELL
MUST BE REGARDED AS POTENTIALLY HAZARDOUS. ALWAYS WEAR SAFTEY GLASSES.
- Carefully fill the cell with liquid Nitrogen
(Temp range 150 to -75șC)
Solid CO2 & Acetone or Methanol (Temp range 75
to -20șC) or
Ice/Salt (Temp range 20 to 0șC).
Fill to within about 15mm from the top of the cell.
- Carefully fit the cell into your Spectrometer
The method varies depending on the instrument you are using (See
general instructions). Select the probe you wish to use.
- Solid Probes
Gently press solid into the 3mm cavity in the probe with a spatula.
- Liquid Probes fill a 5mm NMR tube (supplied) with liquid to a
depth of about 15mm. We do not recommend sealing the tubes. However,
if this is planned make absolutely sure that no gas will be evolved
and/or your liquid will not boil during or after the experiment.
NMR tubes are not intended to withstand pressure. The tubes will
drop down into the liquid probe. If the tube will not fit easily,
clean the bore and try again never force the NMR tube into
The liquid probes used with the C-2 cell [C22 & C24] hold 4mm
diameter tubes. These can be a very precise fit into the probe and
a steel pushing rod is supplied to assist you. The tubes MUST not
be forced into the probe because removal can then be very difficult.
If you wish to control the temperature of your sample, you must
use a heated probe. Once loaded, the heated probe should be carefully
fitted into the dewar and then connected to a Ventacon Universal
Power Supply. For operation see instructions for power supplies.
REMOVAL OF LIQUID TUBES
The C-1 probes have a bore that will accept the sample tube easily IF they are CLEAN.
To remove the sample tube turn the probe upside down and shake to encourage the
tube to fall out.
The C-2 probes accommodate the 4mm diameter tubes very neatly. The tube MUST be free to
slide into the probe without force. To remove insert the steel pushing rod until it
touches the tube. Pull it smartly out of the probe and the sample tube, driven by the
atmosphere will follow it.
OPERATION OF LIQUID
C1 & C2 CELLS WITH HEATED PROBES
These probes, once loaded into your cell in the spectrometer must be plugged into
the COLD socket of Ventacon's DI or DII Universal Power Supply. If
fitted, plug the T/C plug into the T Type T/C socket.
Set up the CAL controller for rtd input if no T/C is fitted and for
tCt if the T Type thermocouple if fitted.
Carry out a TUNE routine using low energy.
In some rare cases, special settings are required. You will be told of these when your
system is supplied.
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