AR 2000 Operator's Manual
46
Installing the Low Temperature Accessory
In order to operate the ETC at temperatures below ambient and also to facilitate rapid cooling, the (optional) low
temperature accessory can be used. This works by supplying a controlled flow of liquid nitrogen/cold nitrogen
that is fed down the inside of the oven and evaporates off the wire wool.
Follow the installation procedure in the previous section up to step 15. Then use
the following additional steps to complete the installation (see Figure 5.24 and
Figure 5.25).
1. Connect the Event cable from the flow control assembly to the Event A connec-
tion on the rheometer.
2. Ensure that the cryogenic system has been installed as directed in the instruc-
tions supplied by the manufacturer.
3. Connect the flexible hose from the outlet of the cryogenic cooling system to the
'Liquid in' connection on the flow meter assembly as shown in Figure 5.23.
Connect the purge gas from the flow control assembly to the rheometer.
4. Connect a gas feed to the 'Gas in' connector on the flow control assembly. If you have a supply of nitrogen
gas follow Figure 5.25, otherwise follow Figure 5.24.
5. Connect the cable from the 'Liq' connector on the flow assembly to the solenoid valve on the cryogenic
system.
6. Set a pressure of 15 to 20 PSI on the Dewar system.
7. Open the control valve approximately two full* turns.
8. Set a flow rate of 10 liters per minute (LPM) on the flow meter assembly.
* The exact setting depends upon the required operating conditions for the ETC as well as the type of cryogenic
cooling system used. Additional information on this setting can be found in "Operating Hints" later in this
chapter.
Figure 5.23
Connecting the Hose
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