User Manual SERVOPRO Plasma Trace N
2
Analyzer
7.0 OPERATION
FIGURE 14: RUN MODE
In this mode, the following information is displayed: measurement in ppm, flow in cc, system
status, and range in use.
The 4 - 20 mA output is refreshed to reflect the level of impurities according to the scale in use.
If you have the digital output option, it can be connected to a remote system to indicate the scale
in use.
If from the "CONFIGURATION MENU" you have selected auto-ranging, the scale will change
according to the ppm value. If you have selected manual ranging, you must select the desired
scale by pressing the "1" key for 0 - 1 ppm, the "2" key for 0 - 10 ppm and the "3" key for 0 -
100 ppm.
In both cases, i.e. manual or auto ranging, the actual scale in use is shown on the display.
The gas sample flow is always displayed. Normally, the value displayed is the value entered in
the CONFIGURATION MENU for the sample flow set point. The value may change when you
select different gas streams or if you get too much inlet pressure variation. The inlet pressure
must be stable - between 34 kPa (5 PSI) to 69 kPa (10 PSI) for best results.
In the run mode, you may get a status message. Normally, the "OK" message is always
displayed. Below is a list of messages and their corresponding meaning:
OK: No problem.
STARTING: Boosted power is applied to the plasma generator for start up. Normally
displayed for a short period of time, but it may take as long as 30 to
45 minutes to start the plasma, depending on gas condition or if cell
temperature is too cold.
Other messages can be displayed where the ppm value is normally displayed. You may get
"Under scale" if the cell count or the calculated ppm value is too low for that scale.
"Over scale" will be displayed if the cell count or calculated ppm value is too high for the scale
in use. "Plasma off" will be displayed if the plasma is off. "Waiting" will be displayed if the
plasma stays off for about 1 minute. In this case, the sample flow will be stopped to protect the
valve. This is a short time operation, however, the sample must always be connected and flow
must pass thru the analyzer.
Measure(PPM): 10.0
Sample flow(CC): 75.0 Scale: 0-10 PPM
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