User`s guide

Installation and Setup

Table 9 Gas Supply Specifications

Gas Connections

Always use clean tubing preferably copper or stainless steel, with the

minimum possible number of joints for carrier gas lines. If

necessary, pass a stream of clean, inert gas through the tubing, while

baking it in an oven at a temperature high enough to remove any

trace organic solvents.

NOTE: Never clean the tubing or fittings with organic solvents.

Any remaining traces of solvent will be concentrated in the

cold trap.

Use compression fittings to make tubing connections. Do not use

soldered joints.

Carrier gas can be a major source of contamination because any

organic volatiles contained in the gas are trapped and concentrated in

the cold trap, and then released when the trap is heated.

Contamination can originate from the gas itself or from the tubing

used to deliver the gas.

Dry Air Dry air is used to drive the pneumatic systems

and to purge the Peltier coolers on the cold trap.

Use extra-dry air with a dew point less than -

50°C.

If extra-dry air is unavailable, then use a zero-air

generator or bottled air with a dew point less

than -50°C.

Liquid

Nitrogen

If the ATD/TD is fitted with the LN2 accessory,

it requires a supply of liquid nitrogen. The liquid

nitrogen does not come into contact with the

sample.

Hydrogen If you are using hydrogen for carrier gas, ensure

that all lines and connections are leak-free. When

using a hydrogen tank, install an in-line

hydrogen flame arrestor (P/N 0009-0038)

between the tank regulator and the delivery

tubing.