TA Instruments RSA-G2, Manual

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RSA-G2 Getting Started Guide Page 25
Subambient Controllers (Optional)
There are two optional subambient controllers for use with the FCO: LN2 Controller and Air Chiller.
LN2 Controller
CAUTION: The bulk tank must be a low pressure (22 psi/1.5 bars) source, as a high pressure tank
will damage the LN2 Controller.
MISE EN GARDE: Le réservoir en vrac doit être une source de basse pression (22 psi / 1,5 bar), vu
qu'un réservoir haute pression endommagerait le régulateur LN2.
NOTE : For LN2 Controller installation instructions, refer to TRIOS software Help.
The LN2 Controller uses liquid nitrogen to extend the lower range of the FCO to
–
150°C. The LN2 Con -
troller is connected between an external liquid nitrogen source and the RSA-G2 test station. Controlled by
the oven supply enclosure through the software, the LN2 Controller consists of a Dewar flask, a solenoid
valve to control liquid nitrogen flow into the Dewar, and hardware to control the boiling of the liquid nitro -
gen to produce cold nitrogen gas within the flask. A second solenoid valve controls the flow of the nitrogen
gas out of the Dewar flask for use by the test station, and a third solenoid valve provides for venting of the
flask while it is filling and while in standby mode when there is no gas flowing through the FCO heaters.
Figure 12 LN2 Controller .
Table 2: LN2 Controller Specifications
Dewar Flask
A Dewar flask is a container specifically designed to efficiently store liquid nitrogen. Dewar flasks help
prevent evaporation due to their double-wall construction. Within the Dewar flask, a heater immersed in
the LN2 provides controlled boiling. The Dewar is equipped with two pressure relief valves to allow
excess nitrogen gas to vent when the LN2 Controller is turned off.
Dimensions 28 cm (11 in) W x 24.1 cm (9.5 in) D x 55.9 cm (22 in) H
Weight 17.3 kg (38 lbs)
Temperature range Extends lower range of oven to –150°C