Humidity, dewpoint and temperature measurement instruments
Relative humidity (RH) is defined as the ratio of the water vapor pressure or water vapor content to the saturation vapor pressure or the maximum vapor content at the temperature of the air or gas. The saturation vapor pressure in the air varies with air temperature, the higher the temperature, the more water vapor it can hold. When saturated the relative humidity in the air is 100 %RH.
Humidity and Dewpoint Transmitters for Fixed Installations
	Vaisala Humidity HMT330 HUMICAP® Humidity and Temperature Transmitter for demanding industrial applications HMT360 Intrinsically Safe Humidity Transmitters Trasnmitters for use in potentially explosive atmospheres HMT100 Humidity and Temperature transmitters for demanding HVAC applications. 2-wire loop powered or 3-wire voltage outputs, interchangeable probe HMD60 / HMD70 Duct-mounted humidity and temperature transmitters for air conditioning applications, IP65 protected. HMW60 / HMW70 Wall-mounted humidity and temperature transmitters for air conditioning applications, IP65 protected HMD40 / HMD50 Duct-mounted transmitters for air conditioning systems; they combine excellent stability with easy installation and reliable operation. IP65 protected. HMW40 / HMW50 Wall-mounted transmitters for air conditioning systems; they combine excellent stability with easy installation and reliable operation. HMT300TMK HUMICAP® Turbine Mounting Kit, heated probe enables accurate humidity readings in water vapor injection applications Vaisala Dewpoint DMT340 Designed for industrial low dewpoint measurements below 10% (RH). Ideal for dry air monitoring and plastic dryers. Optional data logging and (W)LAN interface. DMT346 Constructed for humidity measurement in industrial drying applications with particularly high temperatures. DMW19 Designed for wall mount dewpoint measurement applications. Ideal for HVAC system integrations
	Automation Components ACI A/RH Relative Humidity transmitters, convert a resistance change to a linear 4 to 20 mA, 0 to 5 VDC, or 0 to 10 VDC output. The current signal may be transmitted over long distances on twisted-pair wire and will not be affected by the lead wire resistance or electrical noise. 1%, 2%, 3%, and 5% Accuracies A/RH-TEMP Relative Humidity transmitters, convert a resistance to a linear 4 to 20 mA, 0 to 5 VDC, or 0 to 10 VDC output. The current signal may be transmitted over long distances on unshielded twisted-pair wire and will not be affected by the lead wire resistance or electrical noise.

RH Fixed Installation