Ppm calculation for transformer oils, Figure 22, The water solubility of transformer oils – Vaisala MMT310 User Manual
Page 76: Versus temperature
User's Guide _______________________________________________________________________
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Figure 22 below illustrates the water solubility of mineral transformer oil
as a function of temperature. The margins show the range of variation of
water solubility found in mineral oils.
1311-205
Figure 22
The Water Solubility of Transformer Oils Versus
Temperature
PPM Calculation for Transformer Oils
Traditionally, moisture in transformer oil is measured in ppm units. The
ppm output shows the average mass concentration of water in oil.
MMT318 and MMT317 have an option for ppm output, provided that
this has been selected when ordering the transmitter.
NOTE
Silicone based oils must use MMT318 / MMT317 with the Calculation
Model With Oil Specific Coefficients.