# Dew/frost point temperature calculation - HMT130

## HMT130 User Guide

Document code
M211280EN
Revision
D
Language
English (United States)
Product
HMT130
Document type
User guide

Dew/frost point temperature (Tdf) is calculated with the following formula:

Pw is the water vapor pressure (see the separate calculation formula for Pw). The parameters A, m, and Tn depend on the temperature as shown in table NN.

Table 1. Temperature dependence for A, m, and Tn
T A m Tn
... 0 °C 6.1134 9.7911 273.47