Presys PCA-570-RM Technical Manual page 25

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Negative Range: Access the coefficients to be used for temperatures below or equal to the triple point
temperature of water (0,01 °C).
Recommended Temperature Range (Negative)
Range 4
Range 5
Fig. 13 - Configurable the ITS-90 coefficients.
-189,3442 °C to 0,01 °C
-38,8344 °C to 0,01 °C
Coefficients
A4 , B4
A5 , B5