Working Area Requirements
Gas Requirements
5-8
iCE 3000 Series Pre-Installation Requirements Guide (P/N 9499 500 30031, Version 1.6)
Thermo Scientific
Acetylene
A flame spectrometer requires acetylene at 0.62 bar (9 psi) with flow
rates of between 0.8 and 5.1 L/min. The purity must be at least 98.5%,
with impurities for sulfur and phosphorus of less than 15 ppm, and
water of less than 100 ppm. The balance of the gas should be inert gas.
The instrument is supplied with acetylene gas tubing terminating in
3/8 in. BSP Left Hand tighten thread connections.
Black iron is recommended for internal plumbing of acetylene.
It is recommended that banks of cylinders be used with switch over
valves so that the gas supplies can be used continuously. The cylinders
must be fitted with regulators which can provide an outlet pressure of at
least 0.84 bar (12 psi).
A flashback arrestor must be fitted to pressure regulator outlets.
The cylinders should be stored and operated in a vertical position as far
away from the instrument as the length of the fuel hose permits, and in
an environment free from naked lights or sparks.
NOTICE
Acetylene is usually supplied in cylinders containing about 6.16 m
3
(220 ft
3
) of the gas dissolved in acetone. As the acetylene is used, the
pressure in the cylinder decreases. This can result in release of acetone
that can lead to erratic results and possible instrument damage. A
cylinder must be considered exhausted at 7 bar (100 psi).
The acetylene in the cylinder must be dissolved in acetone. Do not use
acetylene that is dissolved in other solvents (for example, DMF).
WARNING
Explosive Components.
Risk of injuries. Increased carryover of
solvents from the acetylene cylinder may cause severe damage to the
instrument and can cause dangerous situations, like flashbacks,
explosions etc.
Although the iCE 3000 Series system can operate with lower
pressures, the acetylene cylinder must be replaced when the internal
pressure drops below 6.9 bar (100 psi). Do not operate below 6.9 bar
(100 psi).
WARNING
Explosive Components.
Risk of injuries. Acetylene is a highly
flammable gas that can form explosive compounds. Contact with
copper, silver, and alloys containing these metals must be avoided.
Fittings, filters, or tubing containing copper, silver, or other acetylide
forming metals, must not be used.
