Vaisala HMT100 Technical data

www.vaisala.com

HMT100 Series Humidity and Temperature
Transmitter for Demanding HVAC Applications

HMT100 remote probe and wall mount models.

Features/Benefits

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

Dierent output scalings

▪

Compatible with hand-helds

▪

HM70 and HMI41 for calibration

IP65 (NEMA 4) housing

▪

NIST traceable (certificate

▪

included)

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.

Performance

HMT100 incorporates Vaisala
HUMICAP
relative humidity accurately and
reliably. Vaisala HUMICAP
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
ideal.

®

technology that measures

®

is also

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
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.

®

Hand-held

®

Technical data

Performance

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
at +20 °C (+68 °F)
Response time (90 %) at 20 °C in
still air

Humidity sensor Vaisala HUMICAP

TEMPERATURE

Measurement range -40 ... +80 °C (-40 ... 176 °F)
Accuracy at +20 °C (+68 °F) ±0.2 °C (±0.36 °F)

ACCURACY OVER TEMPERATURE RANGE

±1.0 %RH (0 ... 15 %RH)

±1.5 %RH (>15 ... 78 %RH)

8 s with plastic grid

20 s with membrane filter

40 s with sintered filter

®

180

Inputs and outputs

Two-wire output signal 4 ... 20 mA

External loop load 10 ... 35 VDC (R

20 ... 35 VDC (R

= 0 ohms)

L

= 500 ohms)

L

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 R

min. 10 kΩ

L

Mechanics

Material

Housing ABS/PC plastic
Probe chrome coated aluminum
Mounting plate GM45160 ABS plastic

Housing classification IP65 (NEMA 4)
Sensor protection

Plastic grid DRW010522
Plastic grid with membrane filter DRW010525
Sintered stainless steel filter HM46670SP

Connections screw terminals 0.5 ... 1.5 mm
Probe cable lengths 3 m, 5 m, 10 m
Calibration 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

2

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 -40 ... +60 °C (-40 ... +140 °F)
transmitter body, with display -30 ... +60 °C (-22 ... +140 °F)

probe (remote probe only) -40 ... +80 °C (-40 ... +176 °F)
Storage temperature range -40 ... +60 °C (-40 ... +140 °F)
Electromagnetic
compatibility

Industrial Environment

For more information, visit
www.vaisala.com or contact
us at [e-mail]

EN61326-1,

Options and accessories

Spare probe HMP100
Spare extension cable (10 m) DRW220095
Radiation shield DTR502B
Rain shield with installation kit 215109
Installation plate DRW010699
Duct installation kit 215619
Connection cable for HMI41 2591722
Connection cable for HM70 211339

Ref. 210472EN-B ©Vaisala 2009

This material is subject to copyright protection, with all
copyrights retained by Vaisala and its individual partners. All
rights reserved. Any logos and/or product names are trademarks
of Vaisala or its individual partners. The reproduction, transfer,
distribution or storage of information contained in this brochure
in any form without the prior written consent of Vaisala is strictly
prohibited. All specifications — technical included — are subject
to change without notice.