PerkinElmer aanalyst 200 User Manual page 60

Preparing Your Lab
Two types of flame are commonly used for atomic absorption analyses with flame atomization:
the air-acetylene flame and the nitrous oxide-acetylene flame. The specifications and
requirements for the burner gases are given below:
Gas
Acetylene (ethyne, C H
2 2
Air
Nitrous oxide (dinitrogen
monoxide, N O)
2
Never set the outlet pressure to a value exceeding the maximum pressure (Pmax).
Warning: Acetylene – Explosion Hazard
Acetylene can decompose explosively at pressures higher than 103 kPa/ 1.03
bar/15 psig.
WARNING
Α
lways make sure that the acetylene outlet gauge pressure is below these
values.
Air supply requirements
For the burner system, an air supply that is clean, dry, and oil-free is required. The air supply
should provide a minimum of 28 liters/min (1 cubic foot/min) at a minimum pressure of 300 kPa
(44 psig). The air supply should be suitably filtered to remove oil, water, and solid particles.
Air compressor
A small oil-less air compressor meeting the air supply requirements is available from
PerkinElmer. The use of an air dryer filter is strongly recommended to remove entrained water,
oil, water aerosols, and solid particles from compressed air lines. Water in the air supply can
cause severe damage to the pneumatics.
3-16
Purity
) 99.6%, atomic
absorption grade in
acetone (propan-2-one)
oxygen < 20%; particle
free; oil free; water free
99%
Outlet Gauge Pressure
kPa Bar
Pmin Pmax Pmin Pmax Pmin Pmax
80 96 0.8 1.0
300 400 3.0 4.0
300 400 3.0 4.0
psig
12 14
44 58
44 58