User Manual SERVOPRO Plasma Trace N
2
Analyzer
5.0 DESCRIPTION
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5.0 DESCRIPTION
5.1 General description
The SERVOPRO PLASMA Trace Nitrogen in argon Analyzer is an instrument for measuring 0
to 100 ppm nitrogen in argon. This analyzer is designed to work with pure gas. Avoid
introduction of air into the sampling system. If this happens, let clean gas flow in it: the unit will
recover and normally will not require recalibration. The overall functions of the analyzer are
controlled by the microprocessor boards. Different functions are accessed by selecting the proper
menu items on the display with the help of the membrane keypad.
PLEASE READ THE ENTIRE MANUAL BEFORE OPERATING THE ANALYZER.
You will find important comments in all sections of this manual.
5.2 Sampling
The argon sample is introduced through a 1/8" tube Swagelok fitting at the rear of the cabinet.
The sample is directed to a particle filter and goes through a thermofluidic flow control valve.
From there, the argon sample gas is introduced into the plasma cell. The sample coming out from
the cell passes through an electronic mass flow transducer before it is vented into the atmosphere.
The mass flow transducer gives flow information to the microprocessor system. This information
is used to control the intensity of signal to be sent to the thermofluidic flow control valve. The
microprocessor executes a P.I.D. algorithm (proportional - integral - derivative) to maintain the
flow at the set point value. Never block the vent, or permanent damage will result to flow
transducer. Leave vent at atmospheric pressure.
5.3 Power supply
The utility power supply must be stable and transient-free for a reliable operation of the analyzer.
The system has two fuses.
The analyzer has one power supply module delivering D.C. regulated voltage to the signal
conditioning module, the microprocessor system display and the flow control module. If you
have a built-in option, the power supply module may also be connected to it, depending on the
option installed.
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