Addendum; Determination Of Slope (For 2 - Color Operation); Percentage Of Allowed Signal Reduction; Figure 63: Model L Percentage Of Allowed Signal Reduction - Fluke Endurance Series User Manual

Endurance® Series
Users Manual

12. Addendum

Determination of Slope (for 2 – color operation)
12.1.
The following slope settings are approximate and will vary depending on the metal alloy and
surface finish, as well as the application. These are supplied here as examples.
Set the slope to approximately 1.000 for measuring the following metals with oxidized surfaces:
• Stainless Steel
• Iron
Set the slope to approximately 1.060 for measuring the following metals with smooth, clean,
unoxidized surfaces:
• Iron
• Stainless Steel
• Cobalt
• Molybdenum
Molten iron also has an approximate slope setting of 1.060.
How to determine slope?
The most effective way to determine and adjust the slope is to take the temperature of the
material using a probe sensor such as an RTD, thermocouple, or other suitable method. Once
you determine the actual temperature, adjust the slope setting until the sensor's temperature
reads the same as the actual temperature reading. This is the correct slope for the measured
material.
12.2.

Percentage of allowed signal reduction

Figure 63 and Figure 64 show each sensor model's percentage of allowed signal reduction at
all temperatures. Refer to these graphs to estimate what percentage of target area must be
visible to the sensor at temperatures below the minimum temperature (95% attenuation) as
shown in this manual.
1-Color sensors see polluted atmosphere and dirty windows and lenses as
a reduction in energy and give much lower than actual temperature
readings!

Figure 63: Model L Percentage of Allowed Signal Reduction

88
• Cobalt • Steel
• Nickel
• Nickel • Tantalum
• Rhodium • Tungsten
• Steel
• Platinum
Model L – up to 95% allowed signal reduction
800°C (1472°F) to 1800°C (3272°F)
Target Temperature