30Cm (12") Sighting Tube, Stainless Steel Up To 800°C/1470°F (E-St12); Figure 76: Ceramic Sighting Tube (E-Stc12); Figure 77: Stainlless Steel Sighting Tube (E-St12) - Fluke endurance series User Manual

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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!
9.3.9. 30cm (12") sighting tube, stainless steel up to 800°C/1470°F (E-ST12)
Use the E-ST12 stainless steel sighting tube in conjunction with the E-MST tube-mounting
flange in temperature measurement environments where reflected energy is a problem. Fix
the E-MST mounting flange directly to the Water Jacket face. Screw the E-ST12 stainless
steel sighting tube into the E-MST mounting flange.
Sighting tube specification:
 Stainless Steel Sighting Tube, up to 800°C (1472°F), 305 mm (12 in.) long (E-ST12)
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!

Figure 77: Stainlless Steel Sighting Tube (E-ST12)

Innovative High Temperature Infrared Pyrometers

Figure 76: Ceramic Sighting Tube (E-STC12)

75