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

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

Pressure tolerance up to

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100 bar (depending on model)

Next generation Vaisala

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HUMICAP® Sensor for excellent
accuracy and stability

Graphical display of

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measurement trends and over
four-year history

Multilingual user interface

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Excellent performance in harsh

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chemical concentrations

Corrosion resistant IP65

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housing

NIST traceable (certificate

▪

included)

Analog outputs, WLAN/LAN

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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