Fluke DATAPAQ Tracker XL2 User Manual page 41

Working with Thermocouple Probes
Datapaq probes cover a huge range of possible usages. Choose suitable types
for your process, and for the individual probes' locations, from the those listed
above.
The process temperature may determine the choice of thermocouples'
insulation material. PTFE is to be preferred if the temperature of the process is
low enough to permit its use; see p. 36.
Probe Location
The product's geometry and the process's thermal requirements define the
number and location of the thermocouples required for the test. In some
instances it is necessary to install an array of thermocouples to provide
coverage over the entire area of the product. In others, the thermocouples are
located to monitor a specific part of the product.
An array of air probes can provide a view of temperature distribution across
the oven, enabling adjustment of heaters and/or baffles. Measurements on the
surface of the product characterize heat absorption from the air and thus
determine the actual temperature/time profile to which it is subjected.
A combination of air and surface probes enables the rate of heat absorption to
be determined, and thus permits adjustments to optimize thermal efficiency and
product quality.
If required, data acquisition can be triggered by temperature, in which case the
trigger is normally taken from an air probe. On the XL2 logger, this may be
connected to any thermocouple channel.
Thermocouple probes measuring air and/or product temperature will be
attached to any combination of:
• The product.
• A reusable product sample (a test-piece).
• A test-fixture (a structure simulating the product, with probes positioned
appropriately).
OVEN TRACKER XL2
Hanging Strap
Mild-steel strap to be hung from thermal barrier. Clamp or
magnetic thermocouples can be attached to it for easy
transport of the system – or use to attach thermocouples
between runs.
PA2052
Thermocouple Probes
41