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Vaisala
HMW40/50 and HMD40/50 Wall and
Duct Mount Transmitters for HVAC Applications

Features/Benefits

  • Specially designed for building
    energy management systems
  • 10 ... 90 %RH measurement
  • -10 ... +60 °C (+14 ... +140 °F)
    operating range for duct units
  • -5 ... +55 °C (+23 ... +131 °F)
    operating range for wall units
  • 4 ... 20 mA 2-wire output
    (HMD/W40)
  • Selectable voltage 3-wire
    output (HMD/W50)
  • Combines excellent stability
    with easy installation and
    reliable operation
  • No recalibration
  • Fully interchangeable Vaisala
    INTERCAP® Sensor is easy to
    replace
  • Low cost
The two and three-wire Vaisala
INTERCAP® Humidity and
Temperature Transmitters HMD/W40
and HMD/W50 are designed for use
in energy management systems in
buildings. They combine excellent
stability with easy installation and
reliable operation. The HMD40/50
are for duct installations and the
HMW40/50 for wall installations.
Low maintenance costs
The HMD40/50 humidity transmitters
use Vaisala INTERCAP® Sensor -
the world’s fi rst interchangeable
capacitive humidity sensor. The
transmitters require no recalibration
if the sensor is changed. This means
great savings in overall maintenance
costs. The sensor is also insensitive
to dust as well as most chemicals.
Measures both humidity
and temperature

The 40/50 series is available as
humidity and temperature (Y), or
humidity only (U) transmitters. The
transmitters measure humidity with
a ±3 %RH accuracy and a ±1 %RH
stability per year.
Selectable functions
(HMD/W50)

The HMD/W50 transmitters feature
selectable output signals of 0 to 1 V
and 0 to 10 V. They can be powered
by either AC or DC voltage.
HMW40/50
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