Specifications

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HMD 60UO/YO Reliable Outdoor Humidity
& Temperature Transmitter with Solar
Radiation/Precipitation Shield
STABLE PERFORMANCE IN DEMANDING
OUTSIDE ENVIRONMENTS
The HMD 60U and HMD 60Y duct-mount transmitters
provide excellent reliability, long-term stability, and
reliable operation. They incorporate the HUMICAP
®
humidity sensor, which is insensitive to dust and
most chemicals and is not damaged by condensation.
In outdoor environments, the 2212 HM shield
protects the sensors from solar radiation and precipi-
tation, without affecting performance. The HMD 60U
and HMD 60Y measure relative humidity from 0 to
100% RH, and temperature (Model HMD 60Y only)
from
-40 to +140 °F (-40 to +60 °C). Easily installed, they
feature two wire connections, making retrofitting,
upgrading and new installations easy.
SPECIAL FEATURES INCLUDE:
 Full 0 to 100% RH measurement
 2212 HM shield provides excellent ventilation
while blocking direct and reflected solar radiation
 True two-wire transmitter with 4 to 20 mA loop
powered output: compatible with most energy
management systems
 Electromagnetically compatible
 Temperature compensated
 Excellent long-term stability
 Negligible temperature coefficient
 ±2% accuracy (0...90%) ±3% (90%...100%)
 NEMA 4 housing
FAST, ON-SITE CALIBRATION
The accuracy of the transmitters is simple to check
using the HMI 41 humidity calibrator. The calibration
can be done in seconds with a single potentiometer
without disturbing operation. This saves hours of
maintenance time and ensures high system accuracy.
METEOROLOGICAL EXPERIENCE
RESULTS IN SUPERIOR PERFORMANCE
Vaisala has 60 years of experience in measuring
RH &T in outdoor environments. Our experience has
shown, that for accurate measurement, the shield
must not only protect but must be properly venti-
lated. The 2212 HM shield provides these functions
without affecting transmitter performance. The
transmitter and shield can be mounted on the roof or
the side of a building for installation flexibility.
Model HMD 60YO for Relative Humidity and
Temperature, shown above with 2212 HM
Radiation Shield.
Model HMD 60UO for Relative Humidity only.
Model HMD 60T for Temperature only.
FLEXIBILITY OF OUTPUTS
Versatile alternatives to the HMD 60UO/YO
transmitters for outdoor applications are the HMD 70
UO/YO transmitters. These instruments feature
selectable output signals of 0 to 1V, 0 to 5V, 0 to 10V
or 0 to 20 mA. Powered by either AC or DC voltage,
they are available with relative humidity only or
relative humidity and temperature sensors. They are
also equipped with the radiation/precipitation shield.