User Manual SERVOPRO Plasma Trace N
2
Analyzer
7.0 OPERATION
Other messages can appear depending on options or custom features ordered (auto-zero, auto-
span).
When an error is detected, the status (ST) digital output will be deactivated (contact open).
NOTICE: When the flow is lower than 20 cc for longer than 30 seconds, an internal relay will
shut down the plasma generator and the appropriate message will be displayed. When
the flow comes back to normal, the generator restarts.
7.5 Special consideration about the 0 - 1 ppm range
When the 0 to 1 ppm range is selected, the system is very sensitive. The display resolution is
fixed at 10 ppb. In order to use this range efficiently, it is very important that the connections be
leak-free, that there is no moisture and no quick connector and that the unit is installed and
started up properly. It may take some time to get a stable reading. On this range, the response
time is longer. The by-pass flow must be constant, and vent line pressure must be at atmospheric
pressure. Do not forget: NEVER USE LINES OTHER THAN STAINLESS STEEL FOR THAT
TYPE OF MEASUREMENT.
It is normal to see the display reading wander slowly on this range. If higher sensitivity is
required, you must select our ppb analyzer. Of course, the cost of such systems is much higher: it
is normally used by electronic wafer fab industries for end-of-life argon purifier verification.
If you analyze pure argon on this scale, you will get a good approximation of its quality.
It is possible to verify and calibrate this range using the flow dilution technique instead of a gas
cylinder. It is very difficult to use gas cylinders for calibration on this range, because very careful
handling is required. We use the dilution technique.
7.6 Hidden Menu
By pressing 1,2,3 and E (enter) from the Main Menu, the HIDDEN MENU opens.
7.6.1 Starting Count
The starting count value is the threshold value where the analyzer switches from starting mode to
normal mode.
If the cell counts (value from the analog to digital converter; this value may be observed under
diagnostic menu) is under the starting count value, and higher power is applied to the cell by the
plasma generator. Once the plasma is started, the cell counts should become higher than the
starting count value and the power will come back to normal. If for any reason, the cell count
value with the normal power applied to the cell is too close or oscillates around the starting count
value, the analyzer will go back and forth between starting and normal mode.
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