# Dew point temperature - HMT130

## HMT130 User Guide

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

The dew point temperature (Td) of a moist air sample is the temperature to which the sample must be cooled to reach saturation with respect to liquid water.

Dew point temperature (Td) 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 6.119866 7.926104 250.4138
0 ... 50 °C 6.1078 7.5000 237.30
50 ... 100 °C 5.9987 7.3313 229.10
100 ... 150 °C 5.8493 7.2756 225.00
150 ... °C 6.2301 7.3033 230.00