Teledyne LGA-3500 - Laser Gas Analysis system - Manual (Page 29)

Laser Gas Analyzer Installation
Teledyne Analytical Instruments 15
Figure 3-3: Instrument Flange
3.3.3 Checking Offset Using the Laser Pen and Target
The laser pen is an optical transmission adjustment aid tool
available through TAI. The part number is listed in the Spare Parts List
in the Appendix. The laser pen emits visible red light beam and is used
to adjust the coaxial offset of the two instrument flanges. This assumes
that the welded flanges were installed correctly and held to within 4
degrees total offset with respect to each other.
Prior to adjusting the instrument flanges the laser pen must first be
checked for alignment.
3.3.3.1 C HECKING THE L ASER P EN FOR A LIGNMENT
To see if the laser pen is suitable for your installation, apply the
following test:
1. Mount the laser pen on one instrument flange and the scaled
target onto the other instrument flange. Tighten with mounting
nuts.
2. Turn on the laser pen and observe the light spot on the target.