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OMWT-SOFT-OPC Server Corrections
N
57
Predefined Corrections
The device type "Thermistor" will default to a correction ID of 128. To override this
default you can add a CorrID parameter to the device section of the OMWT-SOFT-
OPC.INI file, or you can set a new default for all thermistors in the Server section of
the OMWT-SOFT-OPC.INI file. To change the default CorrectionID for all
thermistors add the parameter "DefaultThermistorCorrID=" to the Server section, and
s
et it to whatever CorrectionID you wish.
Predefined Corrections use the following equations. The first equation normalizes
the passed value, and the second produces the conversion to degrees Celsius.
Parameters:
NTC_DIVIDERES = 10000
NTC_NORMALRES = 10000
Fitting constants:
A = 3.3539264E-3
B = 2.5609446E-4
C = 1.9621987E-6
D = 4.6045930E-8
R
normal
= NTC_DIVIDERES / (32767 / value ) - 1 / NTC_NORMALRES
Value in degrees Celsuis = 1 / ( A + B*R
normal
+ C*R
normal
2
+
D*R
normal
3
)