Vaisala HMT330 Technical data

www.vaisala.com

HMT330 Series Humidity and Temperature
Transmitters for demanding humidity measurement

The HMT330 transmitter family has the solution for demanding industrial humidity
measurements.

Features/Benefits

Six models for demanding

▪

industrial applications

Full 0 ... 100 % RH

▪

measurement, temperature
range up to +180 °C (+356 °F)
(depending on model)

Pressure tolerance up to

▪

100 bar (depending on model)

Next generation Vaisala

▪

HUMICAP® Sensor for excellent
accuracy and stability

Graphical display of

▪

measurement trends and over
four-year history

Multilingual user interface

▪

Excellent performance in harsh

▪

chemical concentrations

Corrosion resistant IP65

▪

housing

NIST traceable (certificate

▪

included)

Analog outputs, WLAN/LAN

▪

The Vaisala HUMICAP® Humidity
and Temperature Transmitter
Series HMT330 is designed for
demanding industrial applications
where stable measurement and wide
customization is important.

Vaisala HUMICAP®
performance

The HMT330 series incorporates
Vaisala’s 30 years of experience in
industrial humidity measurement.
An updated, even more stable and
chemical resistant HUMICAP
is available, next to the proven
reliable and accurate sensor.

®

sensor

Chemical purge minimizes
eects of contaminants

In environments with high
concentrations of chemicals and
cleaning agents, chemical purge
helps to maintain measurement
accuracy between calibration
intervals.

Chemical purge involves heating the
sensor to remove harmful chemicals.
The function can be initiated
manually or programmed to occur at
set intervals.

Graphical display of
history and measurement
trends

The HMT330 can be ordered with
a large numerical and graphical
display, which allows the user to
clearly monitor operational data,
measurement trends and 1-year
measurement history. The optional
data logger with real-time clock
makes it possible to generate over
four years of measured history, and
zoom in on any desired time or time
frame. The battery backup of the
clock guarantees a reliable logging of
measured data.

The display alarm allows tracking
of any measured parameter, with a
freely congurable low and high limit.

Data collection and
(wireless) transfer to PC

The recorded measurement data
can be viewed on the display or
transferred to a PC with Microsoft
Windows
can also be connected to a network
with an optional (W)LAN interface,
which enables a (wireless) Ethernet
connection. A USB-RJ45 cable makes
it easy to connect the service port of
the HMT330 to a PC.

®

software. The transmitter

Many ways to install and
versatile outputs

Mains and DC power options, and
several mounting accessories make
the instrument easy to install.

The HMT330 can have up to three

analog outputs. Isolated galvanic
power supply and analog outputs are
also available. For serial interface the
USB connection, RS232 and RS485
can be used.

Flexible calibration

The HMT330 instruments are
calibrated at six humidity points at
the factory. A quick, one-point eld
calibration can be performed with
the hand-held HM70 meter. A two­point calibration can be performed
with the HMK15 salt bath calibrator
in a controlled environment. The
transmitter can be sent to Vaisala for
recalibration. Accredited calibrations
and maintenance contracts are also
available.

°C

°C

0

0-80 -60 -40 -20 20 40 60 80 100 120 140 160

180

-0.7

-0.6

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

0.6

0.7

Technical data

Performance

RELATIVE HUMIDITY

Measurement range 0 ... 100 % RH
Accuracy (including non-linearity, hysteresis, and repeatability)
with Vaisala HUMICAP
with Vaisala HUMICAP

at +15 ... +25 °C (59 ... +77 °F) ±1 %RH (0 ... 90 %)

at -20 ... +40 °C (-4 ... +104 °F) ±(1.0 + 0.008 x reading) %RH
at -40 ... +180 °C (-40 ... +356 °F) ±(1.5 + 0.015 x reading) %RH

Factory calibration uncertainty (+20 °C) ± 0.6 % RH (0 ... 40 %RH)

Response time (90 %) at +20 °C (+68 °F) 8 s / 17 s* with grid filter
in still air 20 s / 50 s* with grid + steel netting filter

* with HUMICAP

TEMPERATURE

Accuracy at +20 °C (+68 °F) ± 0.2 °C (± 0.36 °F)
Accuracy over temperature range (measurement range
depends on model)

®

180 or 180R for typical applications

®

180C or 180RC for applications with

chemical purge/warmed probe

±1.7 %RH (90 ... 100 %RH)

± 1.0 % RH (40 ... 97 %RH)

(Defined as ±2 standard deviation limits. Small

variations possible, see also calibration certificate.)

40 s / 60 s* with sintered filter

®

180R or 180RC sensor

Inputs and outputs

Operating voltage 10 ... 35 VDC, 24 VAC

with optional power supply module 100 ... 240 VAC, 50/60 HZ

Power consumption at +20 °C (U

RS-232 max. 25 mA

2 x 0 ... 1 V/0 ... 5 V/0 ... 10 V max. 25 mA

U

out

2 x 0 ... 20 mA max. 60 mA

I

out

display and backlight + 20 mA
during chemical purge max. 110 mA
during probe heating (HMT337) + 120 mA

Analog outputs (2 standard, 3rd optional)

current output 0 ... 20 mA, 4 ... 20 mA

voltage output 0... 1 V, 0... 5 V, 0... 10 V
Accuracy of analog outputs at +20 °C ±0.05% full scale
Temperature dependence of the
analog outputs ±0.005%/°C full scale
External loads

current outputs R

0 ... 1 V output R

0 ... 5 V and 0 ... 10 V outputs R
Max. wire size 0.5 mm

Digital outputs RS-232, RS-485 (optional)

24 VDC)

in

L

L

stranded wires recommended

< 500 ohm

> 2 kohm

L

> 10 kohm

2

(AWG 20)

Service connection RS-232, USB
Relay outputs (optional) 0.5 A, 250 VAC
Ethernet interface (optional)

Supported standards 10/100Base-T

Connector RJ45

Protocols Telnet

Software support Vaisala MI70 link
WLAN interface (optional)

Supported standards 802.11b

Antenna connector type RP-SMA

Protocols Telnet

Security WEP 64/128,WPA

Software support Vaisala MI70 link
Authentication / Encryption (WLAN)

Temperature sensor PT 100 RTD 1/3 Class B IEC 751
Other variables available (depends on model)

dewpoint temperature, mixing ratio, absolute humidity, wet bulb
temperature, enthalpy, water vapor pressure

Open / no encryption

Open / WEP

WPA Pre shared key / TKIP

WPA Pre shared key / CCMP (a.k.a. WPA2)
Optional data logger with real-time clock

Logged parameters max. three with trend/min/max values

Logging interval 10 sec (fixed)

Max. logging period 4 years 5 months

Logged points 13.7 million points per parameter

Battery lifetime min. 5 years
Display LCD with backlight, graphic trend display

of any parameter

Menu languages English, Chinese, Japanese, Spanish, German,

French, Swedish, Russian, Finnish

Mechanics

106 (4.17)

116 (4.57)

183 (7.20)

Cable bushing M20 x 1.5 for cable diameter
Measurement range 8 ... 11 mm/0.31 ... 0.43"
Conduit fitting 1/2" NPT
User cable connector (optional) M12 series 8-pin (male)

option 1 female plug with 5 m (16.4 ft) black cable
option 2 female plug with screw terminals

Probe cable diameter

HMT333 (+80 °C) 6.0 mm

other probes 5.5 mm
Housing material G-AlSi 10 Mg (DIN1725)
Housing classification IP 65 (NEMA4)

Operating environment

Operating temperature

for probe same as measurement range

for transmitter body -40 ... +60 °C (-40 ... 140 °F)

with display 0 ... +60 °C (32 ... 140 °F)

Electromagnetic compatibility Complies with EMC standard

EN61326-1, Industrial Environment

Mounting options

Dimensions

Dimensions in mm (inches)

Transmitter with WLAN antenna

Mounting with Wall
Mounting Kit

Pole Installation with Installation
Kit for Pole or Pipeline

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

Mounting with DIN Rail
Installation Kit

Mounting Rain Shield with
Installation Kit

TYPE A PPROVED PRODUCT
CERTI FICATE NO.: A-11440

Ref. B210951EN-A ©Vaisala 2010

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.

HMT331 Humidity and Temperature Transmitter
for Demanding Wall-Mounted Applications

HMT331 Humidity and Temperature
Transmitter for demanding wall­mounted applications

The HMT331 is the state-of-the-art wall-mount humidity instrument.

Features/Benefits

For temperatures -40 ... +60 °C

▪

(-40 ... +140 °F)

Application examples:

▪

cleanrooms, pharmaceutical
processes, greenhouses,
swimming halls, museums and
archives

Technical Data

Temperature measurement range

-40 ... +60 °C (-40 ... +140 °F)

Accessories

PC software + cable 215005
USB-RJ45 Serial Connection Cable 219685
Connection cable for HM70 211339
Wall mounting plate (plastic) 214829
Pole installation kit 215108
Rain shield 215109
DIN rail installation set 215094

Dimensions

Dimensions in mm (inches)

The Vaisala HUMICAP® Humidity and
Temperature Transmitter HMT331
is the top-of-the-line wall-mounted
transmitter for demanding HVAC and
condition monitoring applications.

Compared to regular wall-mounted
transmitters, the HMT331 offers,
higher measurement performance,
better chemical tolerance, advanced
graphical display features, more
powering options, more output
options and a wider variety of output
humidity parameters.

Graphical display of
history and
measurement trends

The HMT330 series features a large
numerical and graphical display,
allowing users to easily monitor
operational data, measurement trends
and one-year measurement history.

The optional data logger with real­time clock makes it possible to
generate over four years of measured
history, and zoom in on any desired
time or time frame.

Outputs and power supply
options for every need

The output options include three
analog outputs, RS-232, RS-485, and
alarm relays.

The voltage supply range is from 10 to
35 VDC. With an additional module,
the transmitter can be connected to
all universal mains AC supplies.

The input/output cable can be fed
through the back of the transmitter,
which is a useful feature, especially
for installations in cleanrooms.

HMT333 Humidity and Temperature Transmitter

37.5 (1.48)

78.5 (3.09)

98.5 (3.88)

Ø 12 (0.47)

M9x1

for Ducts and Tight Spaces

210697 duct installation kit for
HMT333 and HMT337.

For outdoor environments, the
DTR502B solar radiation shield
provides protection for the probe.
The shield can be installed on a pole,
a beam or a at surface.

The HMT333 transmitter has a small probe for remote applications.

Features/Benefits

For remote probe installations

▪

in demanding HVAC
applications

For temperatures -40 ... +80 °C

▪

(-40 ... +176 °F) or

-40 ... +120 °C (-40 ... +248 °F)

Small thermal mass - fast

▪

response to temperature
changes

Application examples:

▪

cleanrooms, pharmaceutical
processes, greenhouses,
environmental chambers

The Vaisala HUMICAP® Humidity and
Temperature Transmitter HMT333 is
a versatile instrument for applicatons
where a small remote probe is
needed.

Flexible installation

To install the probe in ducts,
channels and through walls, an
installation kit is available with an
aluminum ange, lead-through piece,
and steel support bar.

HMT333 has two probe cable
options available, a exible one that
withstands heat up to +80° C, and a
durable cable that withstands heat
up to +120° C. Both cable options are
available in lengths of 2, 5, and 10
meters.

For moderate humidities
and temperatures

The HMT333 is typically used in
demanding HVAC applications such
as cleanrooms, pharmaceutical
processes, and greenhouses, or in
processes of moderate temperature.

For environments with continuously
high humidity, the HMT337 with a
warmed, vapor-tight and stainless
steel probe is recommended.

Technical Data

Temperature measurement range

-40 ... +80 °C (-40 ... +176 °F) or

-40 ... +120 °C (-40 ... +248 °F)

Accessories

Duct installation kit 210697
Cable gland HMP247CG
PC software + cable 215005
USB-RJ45 Serial Connection Cable 219685
Connection cable for HM70 211339
Wall mounting plate (plastic) 214829
Pole installation kit 215108
Rain shield 215109
Solar radiation shield DTR502B
DIN rail installation set 215094

Dimensions

Dimensions in mm (inches)

HMT334 Humidity and Temperature Transmitter

M22×1.5 or

NPT 1/2"

120 (4.72)

170 (6.69)

41 (1.61)

ø12 (0.47)

for High Pressure and Vacuum Applications

The display shows measurement
trends and over four-year real time
measurement history.

The HMT334 is ideal for permanent installations into pressurized or vacuum
processes.

Features/Benefits

For pressures up to 100 bar

▪

and vacuum applications

For temperatures

▪

-70 ... +180 °C (-94 ... +356 °F)

ISO and NPT threads available

▪

Application example:

▪

test chambers

Technical Data

Temperature measurement range

-70 ... +180 °C (-94 ... +356 °F)

Operating pressure

0 ... 10 MPa (0 ... 100 bar)

Accessories

Fitting body ISO M22 x 1.5 210697
Fitting body NPT 1/2" 17225
PC software + cable 215005
USB-RJ45 Serial Connection Cable 219685
Connection cable for HM70 211339
Wall mounting plate (plastic) 214829
Pole installation kit 215108
Rain shield 215109
DIN rail installation set 215094

Dimensions

Dimensions in mm (inches)

The Vaisala HUMICAP® Humidity and
Temperature Transmitter HMT334
is designed to measure humidity
in pressurized spaces or vacuum
chambers. Each probe is tested
to ensure a gas and vacuum tight
installation.

Vaisala HUMICAP®
performance

The HMT334 incorporates Vaisala’s
more than 30 years of experience in
industrial humidity measurement.
The sensor provides accurate and
reliable measurement and is immune
to particulate contamination and
most chemicals.

Graphical display of
measurement trends and
real time history

The HMT330 series features a
numerical and graphical display. The
user can easily monitor operational
data, measurement trends and up to
one-year history.

The optional data logger with real­time clock makes it possible to
generate more than four years of
measured history, and zoom in on
any desired time or time frame.

Using a serial line, the measurement
data can be transferred to a PC where
it can be further processed and
copied to other programs.

HMT335 Humidity and Temperature Transmitter

41 (1.6)

51 (2.0)

ø13.5 (0.53)

192 (7.56)

253 (9.96)

for High Temperatures

The installation flange allows an
adjustable installation depth for the
probe.

The HMT335 has a robust stainless steel probe ideal for high flow rates in hot
processes.

Features/Benefits

For temperatures

▪

-70 ... +180 °C (-94 ... +356 °F)

Long metal probe head

▪

Stainless steel installation

▪

flange available

Adjustable installation depth

▪

Application example:

▪

hot drying processes

Technical Data

Temperature measurement range

-70 ... +180 °C (-94 ... +356 °F)

Accessories

Mounting flange 210696
PC software + cable 215005
USB-RJ45 Serial Connection Cable 219685
Connection cable for HM70 211339
Wall mounting plate (plastic) 214829
Pole installation kit 215108
Rain shield 215109
DIN rail installation set 215094

Dimensions

Dimensions in mm (inches)

The Vaisala HUMICAP® Humidity and
Temperature Transmitter HMT335 has
a long stainless steel probe designed
for high temperatures.

Robust probe ideal for
high flow rates

The HMT335 is ideal for duct
measurements as the probe tolerates
mechanical stress and withstands high
ow rates. The HMT335 can be used,
for example, in a hot drying process.

Graphical display of history
and measurement trends

The HMT335 features a numerical and
graphical display. The user can easily

monitor measurement operational
data, measurement trends and one­year measurement history.

The optional data logger with real­time clock makes it possible to
generate more than four years of
measured history, and zoom in on
any desired time or time frame.

Vaisala HUMICAP®
performance

The sensor provides accurate and
reliable measurement and is immune
to particulate contamination and
most chemicals.

HMT337 Humidity and Temperature Transmitter

ø 12 (0.47)

37.5 (1.48)

79.5 (3.13)

99.5 (3.92)

M9×1

for High Humidity Applications

Duct installation kit

Features/Benefits

For high-humidity applications

▪

in industry and meteorology

Warmed probe for superior

▪

performance in condensing
environments

Small, stainless steel, vapor-

▪

The HMT337 is the ideal transmitter for the most demanding process and
meteorological measurements.

tight remote probe

For temperatures

▪

-70 ... +180 °C (-94 ... +356 °F)

Technical Data

Temperature measurement range

-70 ... +180 °C (-94 ... +356 °F)

Accessories

Cable gland and AGRO HMP247CG
Duct installation kit (RH probe) 210697
Duct installation kit (T probe) 215003
Swagelok fittings (NPT and ISO)
for both RH and T probes
Solar radiation shield DTR502B
Meteorological inst. kit HMT330MIK
PC software + cable 215005
USB-RJ45 Serial Connection Cable 219685
Connection cable for HM70 211339
Wall mounting plate (plastic) 214829
Pole installation kit 215108
Rain shield 215109
DIN rail installation set 215094

Dimensions

Dimensions in mm (inches)

The Vaisala HUMICAP® Humidity
and Temperature Transmitter
HMT337 is delivered in one of three
congurations:

• Basic:non-warmedprobefor

moderate humidities

• Withawarmedprobe:fornear-

condensing conditions and dew
point measurement

• Withawarmedprobeandan

additional temperature sensor: for
near-condensing conditions and
relative humidity measurement

True humidity readings
in conditions of
condensation

The Vaisala unique warmed
probe provides fast and reliable

measurement in environments where
humidity is near saturation. The
warming prevents condensation from
forming on the sensor.

As the probe is warmed, the humidity
level inside it stays below the ambient
level. With accurate temperature
measurement, the ambient dewpoint
can be calculated precisely.

If the relative humidity value is
needed, an additional temperature
sensor is used. The measured
ambient temperature provides
the compensation for calculating
relative humidity and other humidity
parameters.

Many ways to install

A tight installation through a process
wall can be achieved with Swagelok
ttings. Meteorological installation
kits for outdoor installations and duct
installation kits are also available.

®

HMT338 Humidity and Temperature Transmitter
for Pressurized Pipelines

down to the appropriate depth. The
hex nut is tightened with a wrench
to lock the probe in its place. Hot
tapping is possible in pressures up to
10 bar.

Graphical display of
history and measurement
trends

From the display, the user can
easily monitor operational data,
measurement trends and one-year
measurement history.

The optional data logger with
real-time clock makes it possible
to generate more than four years
of measured history, and zoom in
on any desired time or time frame.

The HMT338 is ideal for installations in pressurized processes where the probe
needs to be removed while the is running.

The battery backup of the real-time
clock guarantees a reliable logging of
measured data.

Features/Benefits

Installed through ball valve

▪

– can be inserted and removed
while the process is running

Adjustable probe depth

▪

Pressure tolerance 40 bar

▪

For temperatures

▪

-70 ... +180 °C (-94 ... +356 °F)

Two probe lengths available

▪

The Vaisala HUMICAP® Humidity and
Temperature Transmitter HMT338 is
designed for pressurized processes.

Insert or remove probe
while the process is
running

With “hot tapping”, the probe is
inserted directly into the process
while it is running, without the need
for venting or lowering the process
pressure.

The probe is screwed into a ball
valve assembly that has been xed
to the process pipe or wall. The
adjustable hex nut is hand-tightened
to temporarily hold the probe to the
process. Then the probe is pushed

Vaisala HUMICAP®

The HMT338 incorporates Vaisala’s
more than 30 years of experience in
industrial humidity measurement.
The sensor provides accurate and
reliable measurement and is immune
to particulate contamination and
most chemicals.

Technical Data

Temperature measurement range

-70 ... +180 °C (-94 ... +356 °F)

Operating pressure

0 ... 4MPa (0 ... 40 bar)

Accessories

Ball valve set BALLVALVE-1
Pressure fitting ISO 1/2 to NPT 1/2 210662
PC software + cable 215005
USB-RJ45 Serial Connection Cable 219685
Connection cable for HM70 211339
Wall mounting plate (plastic) 214829
Pole installation kit 215108
Rain shield 215109
DIN rail installation set 215094

Dimensions

Dimensions in mm (inches)