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System Configuration Manual
300510EN, Rev AA
December 2010
Rosemount Raptor
7-6
Section 7. Service Functions
7.3.2 User Defined
Formula
For a resistance temperature sensor, the relation between temperature and
resistance can be specified by a mathematical formula:
R=R
0
*(1+A*T+B*T
2
)
where R is the resistance at temperature T, R
0
is the electrical resistance at
zero degrees Celsius, and A and B are constants.
To create a conversion formula:
1. In the 2240S MTT Temperature Sensor window, choose conversion
method User Defined Formula.
2. Click the Configure User Defined Formula button:
3. Enter the parameters R
0
, A and B in the corresponding input fields.
4. Click the OK button to store the R
0
, A and B parameters in the
temperature transmitter’s database registers.