Vaisala HUMICAP MMT162 Guide de l'utilisateur télécharger pdf (Page 49)

Chapter 4 _________________________________________________________________ Operation

VAISALA ________________________________________________________________________ 47

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

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Vaisala HUMICAP MMT162 Guide de l'utilisateur Page 49