Fluke Thermalert 4.0 User Manual page 64

®
Thermalert 4.0 Series
Users Manual, Rev. 1.1, May 2018
Sighting Tube Carbon Steel (A-ST-CS-45)
Note
When using a customer supplied sighting tube, use caution in specifying the inside diameter and length.
Your sensing head determines what diameter/length combinations are possible without impeding the optical
field of view!
For this reason, the Thermalert 4.0 sensors LT-07 and LT-15 cannot be combined with the above sighting
tubes in its standard length of 300 mm (12 in). Shorten the sighting tube if needed to ensure that the
sensor's spot diameter is half of the inside diameter of the tube (or less) everywhere along the tube length.
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