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USER MANUAL | ICOS | INSTRUCTIONS | UM/ICOS-EN REV. B.2
Appendix D:
(Optional)
The Multiport Inlet Unit (MIU) directs samples of multiple unknown gases and multiple
reference gases through a series of inlet ports and digitally controlled valves directly into
the inlet port of the analyzer. The gas manifold control screen (Figure 100) controls which
gases are introduced into the inlet port of the analyzer in what order and for how long.
By sampling references periodically during an ongoing data run, you can post-correct the
data for long-term drift when active calibration cannot be done.
ABB-LGR offers two versions of the MIU:
8 port
•
16 port
•
Figure 100 shows the front panel of a 16 port MIU.
Control of the MIU is unidirectional. The analyzer does not receive
feedback on the MIU state. If the MIU is enabled in the analyzer Setup
Panel, the data file is tagged with MIU valve descriptions whether or not
the MIU is properly connected. The data file simply logs the condition of
the control signal to the MIU.
Multi-Port Inlet Unit
Figure 100: 16 Port MIU Front Panel
89
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