Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 20)

20
IM11Y01B01-12E-A
1st Edition
3 Installation
3.1 Adjustment and Optimization of Alignment - <600
o
C (1100
o
F)
Installations:
The following procedure will aide in performing an alignment of the TDLS200 analyzer. The
procedure will guide the technician through the necessary steps to align and optimize the signal of
the analyzer. Please read the entire procedure before starting work and ask your local Yokogawa
service group for further information if required. This procedure can also be performed by local
Yokogawa service personnel if required – please contact for further details.
The alignment of the analyzer will be accomplished by first, visually aligning the analyzer
horizontally and vertically. By performing this first step, the signal should be adequate to begin the
alignment procedure.
Once a visual alignment is achieved and a signal is present, the optimization of the alignment will
be accomplished by “sweeping” the launch beam across the detector beam. Alignment of the
detector may be necessary to insure a signal is present. This is accomplished by monitoring the
transmission strength while adjusting the top/bottom and left/right nuts on the alignment bellows.
The adjustments are performed on one axis at a time. The intent is to use the alignment bellows
adjustments to move the beam from one edge of the detector to the other (both horizontally and
vertically), while counting the number of ¼ turns of the nuts required to sweep across the detector.
The beam is then centered by taking the number of ¼ turns necessary to sweep the analyzer from
one signal edge to the other and dividing this number in half and returning the analyzer to the
center by turning the nuts so that the beam is centered.
Example, begin by monitoring the transmission and turning the top/bottom screws so that that the
beam reaches one edge of the detector, this will be noticed by a drop in transmission. Once on the
edge, begin turning the nuts the opposite direction a ¼ turn at a time until you see an increase in
the transmission and then a decrease and eventually a loss of transmission again. If this required
18 (¼) turns to accomplish, turn the nuts back ½ of that amount, or 9 (¼) turns to center the beam.
Repeat this process for the left/right axis. The launch unit will then be centered.
Please refer to the following pictorial guide for further details.