Vigilantplant TDLS8000, User Manual

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<5. Startup>
5-17
IM 11Y01D01-01EN 3rd Edition: Jun. 10, 2016-00
5.3.2 Setting the Process Optical Path Length
Set the process optical path length. The process optical path length is the length that the laser
beam travels through the gas to be measured. As shown in the following figure, enter the length
(L) of the process that the LU and the SCU are connected to. It does not include the length of the
flanges.
If insertion tubes are installed, the optical path length is the length between the closer ends of the
insertion tubes.
LU SCU
Process optical path length (L)
Process optical path length when insertion tubes are installed
Insertion tubes
Figure 5.6 Process optical path length definition
If the LU and SCU are mounted on a free cell, enter the length of the flow cell as the process
optical path length.
l
Setup procedure using HART
(1) From the menu, select “Detailed setup>>Analysis>>Process param.” The following screen
will appear. Select “OPL” and press the right arrow button.
(2) Enter the process optical path length, and tap ENTER to execute writing to the TDLS8000.
To abort, tap ESC.