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USER MANUAL | ICOS | INSTRUCTIONS | UM/ICOS-EN REV. B.2
Internal Pump Exhaust
3. Cap the
4. Click the Rate button (clock icon) on the
access the Data Rate Control Adjustment Panel. (Figure 99)
Operating Mode
5. Click the
data is acquired. Click Save.
The Internal pump will shut OFF, and the External Pump will power ON.
Fast = External pump on/ Internal pump off
o
Slow = External pump off/ Internal pump on
o
Figure 99: Data Rate Control Adjustment Panel
The analyzer restarts sampling at whatever rate was set last.
6. To begin adjustments to the external throttle valve, turn the valve clockwise until it
is completely closed.
a. The gas flow will be routed through the electronic pressure controller.
b. The pressure controller is fully open but not able to pass sufficient flow to
the cell at its target pressure.
7. Turn the throttle valve counter-clockwise to open, while watching the Gas Pressure
reading in the
Parameter Window
a. Find the midpoint control range by slowly opening and closing the high flow
throttle valve while observing the reported cell pressure and noting the
points at which the control range begins and ends.
i.
ii.
port with the provided ¼" Swagelok cap.
radio buttons in the
of the
Each analyzer has a unique pressure set point. For example, if the
cell pressure is 140 Torr in slow mode, then the pressure reading
should be 140 Torr in high flow mode as well.
The gas pressure is reduced to the point that it is within the
electronic pressure controller's range. The ideal setting for the
high flow throttle valve is the middle of the electronic pressure
controller's range.
User Interface Control Bar
FAST
row to select the rate at which
User Interface Control Bar
(Figure 98) to
. (Figure 98)
103
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