Vaisala MMT162 - Manual (Page 46)

User's Guide ______________________________________________________________________
44 __________________________________________________________________ M210934EN-C
Conversion Model with Oil-specific
Coefficients
For additional accuracy, oil-specific conversion model can be used both
for mineral and silicon based oils. An oil sample has to be sent to Vaisala
for modelling. As a result, the specific coefficients (A and B) for the
transformer oil are determined by Vaisala. For additional information,
please contact Vaisala.
The determined coefficients of the transformer oil can be programmed to
the MMT162 by Vaisala or by a user according to the instructions
presented in this chapter.
NOTE Conversion model with oil-specific coefficients is always needed for
silicone based oils.
Setting Oil Coefficients Using Serial Line
If the ppm conversion and oil-specific coefficients have been
programmed at Vaisala, you do not have to set the conversion co-
efficients.
If you have defined the coefficients or separately received from Vaisala
the oil-specific coefficients A and B, related to your own oil type, the
coefficients can be set to the software of MMT162 by using serial line.
OIL
Use the serial line command OIL to display oil-specific parameters for
ppm conversion. With OILI command you can set new oil parameters.
Example:
oil
Oil[0] : -1.66269994E+03
Oil[1] : 7.36940002E+00
Oil[2] : 0.00000000E+00
where
Oil [0] corresponds to parameter A
Oil [1] corresponds to parameter B
Oil [2] Corresponds to parameter C