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5. Commissioning and operation
5.4 Tests/Checks
Test loop resistance of the thermocouple circuit at ambient temperature prior to
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welding/routing the eTEFRACTO-PAD
After completing the welding/routing of the eTEFRACTO-PAD
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resistance at ambient temperature and record results.
Perform any non-destructive examination or heat treatment as required.
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Ensure adequate tube wall thickness at the weld locations. This can be checked by
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thickness testing to customer specifications.
5.5 Welding process
Gas Tungsten Arc Welding (GTAW) is the suggested welding process due to its
relatively clean weld. During welding operation, the requirements of the relevant material
data sheets and the applicable directives and standards must be considered regarding
the heat treatment, filler rods or welding procedures. Proper installation is a major step
in the success of an eTEFRACTO-PAD
is one of the most rugged sensors available, it can be destroyed by improper welding.
5.6 eTEFRACTO-PAD
Locate the perpendicular plane of the peak heat flux on the tube where the sensor is
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to be located.
Align guide channel and shield to the plane and tack weld pad on either side to hold
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onto tube.
Confirm alignment and sensor exit from shield.
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Place chain clamp over the shield and tighten to hold in place.
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Use 3.2 mm [⅛ in] fillet weld to weld the guide channel and heat shield to the tube on
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3 sides using one continuous pass.
Figure 1: Welding details
Peak heat
flux plane
FLUX PLANE
Align shield/
ALIGN
guide channel
SHIELD / PAD
WIKA operating instructions model TC59-E (eTEFRACTO-PAD)
guide channel and shield welding
PEAK HEAT
, record results.
installation. Although the eTEFRACTO-PAD
4
Fillet
FILLET
weld
WELD
to the tube, test loop
13
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