DESIGNED & OPTIMISED EXCLUSIVELY FOR FOURIER TRANSFORM RAMAN SPECTROMETERS

LOW TEMPERATURE CELL (C1 & C2)
OPERATING INSTRUCTIONS

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.

ALL WORK WITH THIS TYPE OF CELL MUST BE REGARDED AS POTENTIALLY HAZARDOUS. ALWAYS WEAR SAFTEY GLASSES.

ASSEMBLY

1. Carefully fill the cell with liquid Nitrogen
   (Temp range –150 to -75ºC)
   Solid CO₂ & Acetone or Methanol (Temp range –75 to -20ºC) or
   Ice/Salt (Temp range –20 to 0ºC).
   Fill to within about 15mm from the top of the cell.
2. 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.
3. Solid Probes
   Gently press solid into the 3mm cavity in the probe with a spatula.
4. 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 probe.
   
   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
FROM PROBES

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.

[Cold Cells]

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