User Manual SERVOPRO Plasma Trace N
2
Analyzer
6.0 INSTALLATION
15
6.0 INSTALLATION
6.1 Electrical
Connect the line cord to the proper line voltage according to the model you have
(i.e. Voltage: 100 to 120 Vac or 220 to 240 Vac; Frequency: 50 to 60 Hz).
For optimum unit performance this voltage must be stable, transient-free and have a stable
frequency. Also, the unit must be properly grounded.
Check the earth (ground) continuity between your electrical supply outlet earth (ground) and the
functional earth (ground) terminal on the rear of the analyzer.
6.2 Gas circuit
For all gas line connections (including calibration gas and sample gas), we recommend the use of
1/8" stainless steel tubing in full length, with no fittings. You must avoid pipe thread
connections: they are usually sealed with Teflon tape and some particles can get into the lines. By
using compression-type tube fittings, the venturi aspiration of outside contaminants is virtually
eliminated.
If you suspect occasional contamination with air, it is a good idea to install a small molecular
sieve trap (50 cc to 100 cc) at the sample inlet. This minimizes pollution with moisture. Moisture
or air will not damage the cell, but will give noise and instability. Again, this analyzer is designed
to operate with clean gas.
Tube quality is often overlooked. For a 1/8" O.D. tube, use a minimum wall thickness of .028".
The tube must be purchased to meet ASTM69 specifications. Inferior quality tubes may have
irregularities on their circumference, causing inadequate sealing with compression tube fittings.
Install a by-pass rotometer on your sample line. Install the rotometer near the analyzer and close
to the stream selection valve. This increases gas velocity and allows a faster purging of the
sample line, before selection. You will also get a faster response time this way. Also adjust your
sample line pressure to a value which will bring proper flow into the system: higher sample line
pressure results in longer response time.
All lines must be cleaned and purged to remove any trace of moisture or particles. Particles can
damage your stream selection valves. Also, particles in the inlet filter will trap moisture.
After all these precautions are taken, the pressure regulator on the calibration cylinder must also
have a S.S. diaphragm and compression tube fitting on the low pressure side, and CGA fitting on
the high pressure side. A regulator with discharge pressure adjustable from 0 to 207 kPa (30 PSI)
is recommended. Apply equal pressure for the zero, the span gas, and the sample gas.
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