Vaisala HMT100 Series
HMT100 Series Humidity and Temperature
Transmitter for Demanding HVAC Applications
∙ Full 0 ... 100 %RH measurement
• Two-wire loop-powered or three-wire
voltage output configurations
• Fixed and remote probe models
• Display available
• Relative humidity, dewpoint,
temperature outputs
• Vaisala HUMICAP® sensor
• Interchangeable probe module for
minimal maintenance downtime
• Different output scalings
• Compatible with hand-held HM70
and HMI41 for one-point calibration
• IP65 (NEMA 4) housing
• NIST traceable (certificate included)
HMT100 remote probe and wall mount models.
The Vaisala HUMICAP® Humidity
and Temperature Transmitter Series
HMT100 are designed for humidity and
temperature monitoring in demanding
only, dewpoint only, or relative humidity
and temperature, or dewpoint and
temperature. The transmitter is available
with one or two analog output channels
depending on the selected parameters.
Typical applications include stability
rooms, HVAC, livestock farms,
greenhouses, indoor swimming pools,
and outdoor applications.
Interchangeable probe
The probes are interchangeable and
when changing them, the transmitter
requires no calibration or adjustment,
saving both time and costs.
HMT100 incorporates Vaisala
HUMICAP® technology that measures
relative humidity accurately and reliably.
Vaisala HUMICAP® is also resistant to
dust and most chemicals. Vaisala has
30 years of experience in industrial
humidity measurement.
Available options
The new 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 ideal.
You can order HMT100 with a
configuration that best suits your needs.
HMT100 can show relative humidity
The accuracy of the instrument can also
be checked using the Vaisala Humidity
Calibrator HMK15, which is based on
saturated salt solutions.
The remote probe comes with a cable for
which there are three options in length:
3 m, 5 m, or 10 m.
Installation kits
HMT100 can also be installed outdoors
using the kit especially designed for it or
directly into an air conditioning channel
using the 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
The Vaisala HUMICAP® Humidity and
Temperature Transmitter Series HMT100
measure relative humidity or dewpoint, and
temperature accurately in humid and wet
Vaisala Instruments Catalog 2008
Ref. B210712en rev. A
Technical Data
Relative humidity
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
Mounting plate GM45160
Housing classification
Sensor protection
Plastic grid
Plastic grid with membrane
Sintered stainless steel filter
Probe cable lengths
Measurement range
Accuracy at +20 °C (+68 °F)
ABS/PC plastic
chrome coated aluminum
ABS plastic
IP65 (NEMA 4)
screw terminals 0.5 ... 1.5 mm₂
3 m, 5 m, 10 m
with HM70, HMI41 with
11 %RH & 75 %RH buttons or
with up and down buttons
Display option
One line, changing variable or fixed variables when two
variables are ordered.
-40 ... +80 °C (-40 ... 176 °F)
±0.2 °C (±0.36 °F)
Options and accessories
Spare probe
Spare extension cable (10 m)
Radiation shield
Rain shield with installation kit
Installation plate
Duct installation kit
Connection cable for HMI41
Accuracy over temperature range
Temperature sensor
Dimensions in mm (inches)
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
Electromagnetic compatibility
-40 ... +60 °C (-40 ... +140 °F)
-30 ... +60 °C (-22 ... +140 °F)
-40 ... +80 °C (-40 ... +176 °F)
-40 ... +60 °C (-40 ... +140 °F)
Complies with EMC standard
EN61326-1, Industrial
Inputs and Outputs
Two-wire output signal
external loop load
Voltage output signals
supply voltage
current consumption,
35 VDC/24 VAC
external load
Vaisala Instruments Catalog 2008
Ref. B210712en rev. A
Wiring Diagram
4 ... 20 mA
10 ... 35 VDC (RL = 0 ohms)
20 ... 35 VDC (RL = 500 ohms)
0 ... 1 V, 0 ... 5 V, 0 ... 10 V
(0 ... X V see order form)
10 ... 35 VDC/24 VAC
max. 12 mA
RL min. 10 kΩ
HUMICAP® is a registered trademark of Vaisala.
Specifications are subject to change without prior notice.
©Vaisala Oyj
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