HMT100 Series Humidity and Temperature

HMT100 Series Humidity and Temperature
HMT100 Series Humidity and Temperature
Transmitter for Demanding HVAC Applications
HMT100 remote probe and wall mount models.
Full 0 ... 100 %RH measurement
Two-wire loop-powered or
three-wire voltage output
Fixed and remote probe
Display available
Vaisala HUMICAP® sensor
Different output scalings
IP65 (NEMA 4) housing
Relative humidity, dewpoint,
temperature outputs
Interchangeable probe module
for minimal maintenance
Compatible with hand-helds
HM70 and HMI41 for calibration
NIST traceable (certificate
The Vaisala HUMICAP® Humidity
and Temperature Transmitter Series
HMT100 are designed for humidity
and temperature monitoring in
demanding environments.
Typical applications include stability
rooms, HVAC, livestock farms,
greenhouses, indoor swimming
pools, and outdoor applications.
HMT100 incorporates Vaisala
HUMICAP® technology that measures
relative humidity accurately and
reliably. Vaisala HUMICAP® is also
resistant to dust and most chemicals.
Available options
The HMT100 is available as a wall
mount or remote probe model with
an optional display. For high
temperature applications or where
space is limited, the remote probe is
HMT100 can show relative humidity
only, dewpoint only, or relative
humidity and temperature, or
dewpoint and temperature readings.
The probes are interchangeable
without having to calibrate or adjust
the transmitter.
HMT100 can also be installed
outdoors using an installation kit,
or directly into an air conditioning
channel using a duct installation kit.
Annual calibration
Calibration is recommended typically
at an interval of one year using either
the Vaisala HUMICAP® Hand-held
Humidity and Temperature Meter
HM70 or the Vaisala HUMICAP®
Humidity Indicator HMI41.
The accuracy of the instrument can
also be checked using the Vaisala
Humidity Calibrator HMK15, which is
based on saturated salt solutions.
Technical data
Inputs and outputs
Relative humidity
Two-wire output signal
External loop load
Measurement range
0 ... 100 %RH
Accuracy against factory standards including non-linearity,
hysteresis, and repeatability
at +15 ... +25 °C (+59 ... +77 °F)
±1.7 %RH (0 ... 90 %RH)
±2.5 %RH (90 ... 100 %RH)
at ±0 °C ... +40 °C (+32 ... +104 °F)
±(1.7 +0.015 x reading) %RH
at -40 ... ±0 °C, +40 ... +80 °C
±(2.0+0.025 x reading) %RH
(-40 ... +32 °F, +104 ... +176 °F)
Factory calibration uncertainty
±1.0 %RH (0 ... 15 %RH)
at +20 °C (+68 °F)
±1.5 %RH (>15 ... 78 %RH)
Response time (90 %) at 20 °C in
8 s with plastic grid
still air
20 s with membrane filter
40 s with sintered filter
Humidity sensor
Vaisala HUMICAP® 180
Measurement range
Accuracy at +20 °C (+68 °F)
-40 ... +80 °C (-40 ... 176 °F)
±0.2 °C (±0.36 °F)
Accuracy over temperature range
4 ... 20 mA
10 ... 35 VDC (RL = 0 ohms)
20 ... 35 VDC (RL = 500 ohms)
Voltage output signals
0 ... 1 V, 0 ... 5 V, 0 ... 10 V
(0 ... X V see order form)
Supply voltage
10 ... 35 VDC/24 VAC
Current consumption, 35 VDC/24 VAC
max. 12 mA
External load
RL min. 10 kΩ
ABS/PC plastic
chrome coated aluminum
Mounting plate GM45160
ABS plastic
Housing classification
IP65 (NEMA 4)
Sensor protection
Plastic grid
Plastic grid with membrane filter
Sintered stainless steel filter
screw terminals 0.5 ... 1.5 mm2
Probe cable lengths
3 m, 5 m, 10 m
with HM70, HMI41,
or with internal 11 %RH & 75 %RH buttons
Display option
One line fixed variable or changing variables when two variables
are ordered
Options and accessories
Temperature sensor
Pt1000 IEC 751 1/3 class B
Dewpoint temperature (calculated)
Measuring range
-20 ... +80 °C (-4 ... +176 °F)
Operating Environment
Operating temperature range
transmitter body, no display
transmitter body, with display
probe (remote probe only)
Storage temperature range
-40 ... +60 °C (-40 ... +140 °F)
-30 ... +60 °C (-22 ... +140 °F)
-40 ... +80 °C (-40 ... +176 °F)
-40 ... +60 °C (-40 ... +140 °F)
Industrial Environment
Spare probe
Spare extension cable (10 m)
Radiation shield
Rain shield with installation kit
Installation plate
Duct installation kit
Connection cable for HMI41
Connection cable for HM70
Ref. 210472EN-B ©Vaisala 2009
This material is subject to copyright protection, with all
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of Vaisala or its individual partners. The reproduction, transfer,
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in any form without the prior written consent of Vaisala is strictly
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