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Measurement Considerations
Instrument Compatibility
The 80PK-26 is compatible with any temperature-
measuring instrument that's accepts Type K
thermocouples, has a miniature thermocouple connector,
and has cold reference junction compensation. Accuracy
of the temperature-measuring instrument must be
considered along with the 80PK-26 accuracy specification
to determine the overall accuracy of the combination.
Temperature Limitations
The tip area (thermocouple-sheath) of the 80PK-26 has a
continuous temperature rating of 816 °C (1500 °F).
However, the opposite end of the sheath nearest the
handle should not be subjected to temperatures greater
than 125 °C (257 °F). This is the maximum temperature
limitation of the handle.
Media Limitations
The stainless steel sheath should not be exposed to
halides or sulfides. Even though the sheath to junction
transition is sealed, it is not recommended to immerse the
probe in liquid or saturated vapor. The 80PK-26 should not
be used in reducing atmospheres or in a vacuum. Excess
mounting force can deform or crush the bead. With the
probe perpendicular to the measurement surface, do not
apply more than 12.25 new tons (2.75 pounds-force). Use
proportionally less force as the angle to the measurement
surface becomes more acute.
Operation
Use the 80PK-26 as follows:
1.
Using the miniature (0.312 inch spacing)
thermocouple, connect the 80PK-26 to a compatible
Type K temperature-measuring instrument.
2.
Turn on the measuring instrument, and select the
appropriate range and scale.
3.
Check the read out on the measuring instrument. With
no heat or cold source applied to the bead, the
measuring instrument should display the ambient
(room) temperature. If the instrument does not read
out properly, refer to "Troubleshooting".
Minimizing Thermal Shunting
The 80PK-26 Tapered Temperature Probe should be
inserted at least 6.35 cm (2.5 in) into the environment to
be measured to minimize the shunting effect of the sheath.
Measuring Technique
Here are some suggestions for improving the accuracy of
your temperature measurements:
1.
Make sure there is a good connection between
the probe and the surface you are measuring by
doing any of the following:
a.
Increase the mounting pressure
b.
Use an interface agent (such as silicone grease)
between the thermocouple probe and the surface
you are measuring.
c.
Use a thermal epoxy to attach the thermocouple.
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