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It's the Dew Point Stupid
Dew Point Economizer Guide
AirTest Dew Point Control Solutions
CO2 & Over Ventilation. Over ventilation of buildings can have a significant impact on humidity control, CO2 control can reduce this impact

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Moisture control in buildings is becoming a critical issue particularly when buildings are becoming more energy efficient by adding insulation, utilizing thermal pane windows and utilizing much more efficient cooling equipment. All of these initiatives reduce the sensible load (dry bulb) in buildings meaning that cooling equipment runs for shorter periods of time to cool the space to the target temperature. At the same time, moisture loads (or latent loads) in the space contributed by outside air ventilation, people and some indoor activities have not been affected by these energy initiatives. As air conditioners run less frequently, their ability to remove and control moisture in the space is also diminished. In many buildings we are at the point where we cannot depend on temperature sensing to control moisture. It is now necessary to separately measure moisture and in some cases employ specific dehumidification strategies to control it.

Dew point (Td) is increasingly being used as a moisture measurement & control parameter for two reasons:

  1. It is a direct measure of only the moisture content in the air, unlike a measure of relative humidity that is a hybrid measurement of temperature and moisture.
  2. The dew point is an accurate predictive value that indicates the temperature at which moisture will condense out of the air. Liquid moisture condensing on surfaces can cause staining, creates a ideal environment for mold growth and left unabated can result in structural deterioration of many building components.

This section contains information on devices that measure dew point and that also measure temperature and humidity. For further reference on the important role of dew point please review some of the whitepapers on the right side of this page.

Indoor Wall Mount Dew Point Transmitter


Indoor Humidity & Temperature Transmitter (Wall & Duct)

EE10 Analog
EE160 Analog, Modbus
EE21 Analog

Outside Air Dew Point For Economizer Control

EE210 Temp + Choice of
7 Moisture Values
RM1000 Outdoor Radiation Shield With OA Probes
EE060 Humidity & Temperature Probe
EE23 - Analog Output

EE07/EE08 - Analog/Serial Output

Humidity And Dew Point Probes

EE060-061 Analog

EE070-071 Serial (E2), Modbus
EE08 Serial (E2), Voltage

Surface Condensation Switch


Published: February 16, 2004 Last Updated: May 6, 2013