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Installation
Connecting the Oven Cryogenic System
16
TRACE 1300 and TRACE 1310 Hardware Manual
Thermo Scientific
Oven Cryo System with Liquid Nitrogen Connection
This Oven cryo system consists of a tube for liquid nitrogen inserted into the oven and fitted
with a 1/8-in. solenoid valve for liquid nitrogen mounted into the back of the GC.
The tube for liquid nitrogen is covered with an insulating material tube.
Liquid Nitrogen must be supplied at a pressure of 1.5 bar (150 kPa; 21.75 psig). Plumbing to
the GC should be 1/4-in. copper or stainless steel tubing with insulation. It is your
responsibility to ensure the delivery connection from the liquid nitrogen cryogenic supply is
adaptable to 1/4-in. tubing. The liquid nitrogen cryogenic valve on the GC is a 1/4-in.
Swagelok fitting.
shows the proper configuration for a liquid nitrogen tank.
Figure 16.
Liquid Nitrogen Tank Configuration
To connect the cryogenic system to the liquid nitrogen supply
1. Connect the proper end of the cryo supply tube to the 1/8-in. NPT connection of the
solenoid valve using the proper nut and ferrule. Use a 7/16-in. wrench to tighten the
fittings. See
WARNING
High pressures and extremely low temperatures make liquid nitrogen a
hazardous material. High concentrations of liquid nitrogen in the air can be an
asphyxiation hazard. To avoid injury, always follow the safety precautions and delivery
system design recommended by your gas supplier.