User Manual SERVOPRO PLASMA Trace N
2
Analyzer
APPENDIX 7
88
FIG 5: SETTING THE SPAN GAS VALUE
With the numeric keys, enter the zero gas value in PPM followed by the E key. The actual value of the zero gas is then updated in
front of “Actual value:”. To set the span gas value, go back to the CALIBRATION MAIN MENU by pressing F4 and then press
F2. With the numeric keys, enter the span gas value in ppm followed by the E key. The actual value of the span gas is then
updated in front of “Actual value:”. The span and zero gas values for calibration are now set and a manual or an automatic
calibration can be performed. Press F4 to get out of this menu and to go back to the CALIBRATION MAIN MENU.
2.2 Manual Calibration
You have to select the “MANUAL” mode if you want to perform a manual calibration. To do so, go to the CALIBRATION
SELECTION MODE MENU (FIG 2) by pressing F2 from the MAIN MENU (FIG 1). Toggle between calibration modes by
pressing F1 until “MANUAL” is displayed. Then, toggle between gases by pressing F2 until “ZERO” is displayed (SOV2 is
energized).
Be sure that the zero and the span gas values are set (see the previous section) and let the zero gas flow in the instrument for a
while. The zero gas must flow long enough to be sure that the previous gas is purged away and that the system has returned to
equilibrium. When working with Argon, the purge time is quite fast. However, Helium is a poor purge gas. 20 to 30 minutes is
then recommended for a purge in helium. You may watch the cell counts in the DIAGNOSTIC MENU to make sure that the
signal is stable before executing a calibration.
When done, press F3 from the CALIBRATION MAIN MENU (FIG 3) to enter the CALIBRATION FACTOR CALCULATION
MENU.
FIG 6: CALIBRATION FACTOR CALCULATION MENU
When the cell counts are stable, press F1 to re-zero the analyzer with the gas currently flowing. Selecting F2 will confirm the re-
zero and calculate the calibration factors. The analyzer will display the message “PLEASE WAIT” in front of “CALIBRATION
STATUS” and finally, this message will be replaced by “ZERO DONE” to confirm the zero calibration. If the zero and span
values were not set properly, “WRONG CAL. GAS VALUE” will be displayed. Change the zero and span values, with the span
value bigger than the zero value, and try again. If a right re-span was previously performed before this re-zero, “CALIBRATION
DONE” will be displayed.
<<CALIBRATION FACTOR CALCULATION>>
Measure:0.00 PPM Sample Flow:75.0 CC
F1:Zero F2:Span F4:RET
Calibration status:
<<CALIBRATION MENU>>
Input SPAN value: 0.00
Actual Value:0.00
Value must be in PPM F4:RET
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