Specifications

51
40/50 Series Calibration-Free Wall/Duct
Mounted Humidity & Temperature
Transmitters
FEATURES/BENEFITS
 Never need calibration
 Fully interchangeable INTERCAP
®
sensor is easy to
replace
 Low cost
 0...100 %RH measurement
 +14...140 °F measuring range
(HMD 40Y/HMD 50Y)
 +23...131 °F measuring range
(HMW 40Y/HMW 50Y)
 4-20 mA 2-wire output (HMD/W 40)
 3-wire selectable output (HMD/W 50)
INTERCHANGEABLE SENSOR
Vaisala's HMD/W 40 and HMD/W 50 series incorpo-
rate the revolutionary INTERCAP
®
sensor. Because
the INTERCAP is fully interchangeable, these trans-
mitters never need calibration. Instead, the user can
easily replace the INTERCAP sensor himself without
the expense and inconvenience sometimes associ-
ated with the calibration process. And, in the duct
mount model, the sensor's membrane filter/mechani-
cal housing protects it from dirt and dust.
HUMIDITY & TEMPERATURE OR
HUMIDITY ONLY
The duct and wall-mounted 40 and 50 series are
available as humidity and temperature (Y), or
humidity only (U) transmitters.
SELECTABLE FUNCTIONS (HMD/W 50)
The HMD/W 50 transmitters feature selectable output
signals of 0 to 1V and 0 to 10 V. Powered by either
AC or DC voltage, these transmitters can be duct or
wall mounted.
HIGH PERFORMANCE AT LOW PRICES
Specifically designed for HVAC/EMCS applications,
the HMD/W 40 and 50 series typically measure
humidity levels with ±3 %RH accuracy and ±1 %
stability per year. Easily installed directly into air
ducts or within the controlled area, these transmitters
feature two or three-wire connections, making
retrofitting, upgrading or new installations easy.
Competitively priced and requiring no routine
maintenance, these calibration-free transmitters are
a smart choice for your HVAC/EMCS applications.
40 series: 2-wire, 4 to 20 mA output
Wall mount RH only HMW 40U
RH & T HMW 40Y
Duct mount RH only HMD 40U
RH & T HMD 40Y
50 series: 3-wire, voltage output
Wall mount RH only HMW 50U
RH & T HMW 50Y
Duct mount RH only HMD 50U
RH & T HMD 50Y
HMD/W 40 and
50 Series