User Manual SERVOPRO Plasma Trace N
2
Analyzer
6.0 INSTALLATION
16
Regulator purging is critical. When you connect the regulator to a cylinder, it is full of air (790
000 ppm of N
2
). If you open the valve on the cylinder and leave it open even for a short period of
time, the air inside the regulator will diffuse into the cylinder. It is impossible to know exactly
how much nitrogen you may have in your cylinder. Naturally, because this cylinder has no more
correspondence to its analyzed certificate, it must not be used as a reference.
Very often (too often!!), problems related to this type of analyzer (and this applies also for trace
oxygen analyzers) occur from an inefficient purge of the pressure regulator, resulting in a bad
calibration gas. Regulator purging is an operation that is not always given the attention it
deserves when using calibration gases.
The end user should understand that what happens to the gas between the cylinder and its end use
is controlled by the quality of connecting lines and the efficiency of the purging procedures.
Please refer to appendix 1 for more details about sampling system and regulator purging.
This is what we recommend and this is what we approve. Our performances are
guaranteed if installation is done as per drawing CAI-4003. Nothing else will be better
than this.
The vent of the analyzer must be at atmospheric pressure. If you suspect vent blocking, install a
back-pressure regulator or a relief valve with a pressure setting of 7 kPa (1 PSI). This will
prevent over pressurization of the system. Remember, the analyzer will perform better if the vent
is working at atmospheric pressure. You may use 1/8" S.S. tubing for a length of 10 feet. At this
point use 1/4" - or bigger - tubing to vent the analyzer.
6.3 Analyzer cabinet installation
This unit is designed for a rack mounted cabinet. If you install it in a different type of cabinet
without side support bracket,
you must install a metal bracket to support the rear
side of the cabinet.
Like every analytical equipment, it must be installed properly. The unit should not be installed in
direct sunlight and exposed to any vibrations. The ideal room temperature is around 25
o
C and,
most important of all, the temperature must be stable; it is essential to avoid excessive excursion
in temperature swings.
Never install the analyzer in an area where a strong electromagnetic field is present. Never use
radio transmitters near the analyzer. Also, it is a good idea to eliminate fluorescent lights near
sensitive electronic circuits.
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