Introduction
Agilent Microwave Plasma Atomic Emission Spectrometers User’s Guide 21
Air — for supply of air to the plasma when analyzing organic
samples
The MP-AES instrument is fitted with PTFE gas supply hose
assemblies, 1.8 meters (6 feet) in length, and 1/4 inch Swagelok
hardware.
The operator (or other authorized personnel) must carry out
appropriate leak tests necessary to ensure safety on the gas
connections that the operator is directed to assemble during
installation, normal use or maintenance.
To avoid an unacceptable pressure drop in the tubing, the nitrogen
and argon supplies from the regulator to the instrument should be
not less than 3 mm internal diameter and not more than 10 m length.
This will give a pressure drop of approximately 50 kPa in the tubing.
CAUTION
Use only the tubing supplied with the instrument (or equivalent quality) to deliver
argon to the instrument. Inferior plastic or rubber tubing may cause ignition
problems due to contamination of the argon by atmospheric gases.
Exhaust system
The plasma operates at extremely high temperatures. The MP-AES
instrument exhaust fumes can be noxious or corrosive.
The MP-AES instrument exhaust must be directly connected to an
exhaust system. The exhaust system must include an exhaust fan, be
ducted to an external vent and provide a minimum flow of 3 m
3
/min
(106 ft
3
/min).
The exhaust system installation must comply with any rules and/or
regulations that may be imposed by the local authorities responsible
for control of facilities and fixtures in the workplace.
The exhaust fan should be located at least 2 meters (6 ft, 6 in) away
from the top of the MP-AES instrument chimney. The fan control
switch and running indicator lamp should be located in a position
where the instrument operator can view the indicator and access the
control switch.
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