ABB GLA131 Series Microportable Analyzers
User Manual
ABB PROPRIETARY INFORMATION
51
lines: Up Arrow - peaks adjust to the right; Down Arrow - peaks adjust to
the left.
6. De-select the Disable Laser Frequency Lock checkbox. The software
resumes automatic tracking and control of the laser wavelength.
7. Click Close to exit the menu and return to the Main panel.
Figure 43 shows the laser voltage adjusted so that the absorption peak is centered
on the target line.
Figure 43: Absorption Peaks Centered Correctly on Target Lines
MIU
The (optional) Multi-Port Inlet Unit (MIU-8) is an ABB accessory that allows
automated control of 8 inlet ports.
The MIU-8 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
MIU
menu (Figure 44) 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.
