TA DISCOVERY DSC2500 Getting Started Manual page 49

b Discovery DSC gas ports:
Figure 35 Gas ports on back of Discovery DSC.
2 Ensure that the pressure of your cooling gas is regulated to 140 kPa gauge (20 psig). Dry nitrogen should
be used.
NOTE: The gases used should be moisture-free. Nitrogen gas of high purity is recommended and can be
obtained from a liquid nitrogen source as vaporized gas rather than a compressed gas cylinder.
3 Use 1/4-inch O.D. tubing to connect the dry nitrogen gas source to the COOLING GAS port on the
rear of the DSC. Teflon
automatically controlled by the instrument and can be turned on or off from within TRIOS software,
while the flow rate is limited by an orifice inside the instrument.
4 Use 1/8 inch OD tubing to connect the dry nitrogen gas source to the GAS 1 port. Again, ensure that
the pressure of your cooling gas is regulated to 140 kPa gauge (20 psig). The base purge flow rate is
determined by an internal orifice and the line pressure. Adjust the line pressure to achieve approximately
300 mL/min flow rate while making sure not to exceed the 140 kPa gauge (20 psig) pressure limit.
5 Use 1/8-inch O.D. tubing to connect the helium gas source to the GAS 2 port. Teflon TFE tubing with
Swagelok fitting is recommended. Set the pressure to 103 kPa (15 psig); in TRIOS software, set the flow
rate to 25 mL/min.
Figure 36 Gas line configuration for DSC-LN Pump system.
Discovery DSC™ Getting Started Guide
®
TFE tubing with Swagelok fittings is recommended. A solenoid valve is
GAS 1 port
COOLING GAS port
GAS 2 port
1/8-in tubing (helium) connected
to GAS 2 port
1/8-in tubing (dry nitrogen source)
connected to GAS 1 port
1/4-in tubing (dry nitrogen source)
connected to COOLING GAS port
Page 48