Appendix
56 Rev. E2 04/2011 Marathon MR
11.3 Typical Slopes
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 • Cobalt • Steel
• Iron • Nickel
Set the slope to approximately 1.060 for measuring the following metals with smooth, clean,
unoxidized surfaces:
• Iron • Nickel • Tantalum
• Stainless Steel • Rhodium • Tungsten
• Cobalt • Steel
• Molybdenum • Platinum
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.
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