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Vaisala HMT330 Series Humidity and Temperature Transmitters

Humidity and Temperature Transmitters
HMT330 Series

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® sensor is available, next to the proven reliable and accurate sensor.

Chemical purge minimizes effects 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 configurable 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® software. The transmitter 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.

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 field 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.

• 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

Relative humidity
Measurement range
0 ... 100 % RH
Accuracy (including non-linearity, hysteresis, and repeatability)
with Vaisala HUMICAP® 180 or 180R
for typical applications
Accuracy (including non-linearity, hysteresis, and repeatability)
with Vaisala HUMICAP® 180 or 180R
for applications with chemical purge/warmed probe
at +15 ... +25 °C (59 ... +77 °F) ±1 %RH (0 ... 90 %)
±1.7 %RH (90 ... 100 %RH)
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)
± 1.0 % RH (40 ... 97 %RH)
(Defined as ±2 standard deviation limits. Small variations possible, see also calibration certificate.)
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
40 s / 60 s* with sintered filter
Accuracy at +20 °C (+68 °F) ± 0.2 °C (± 0.36 °F)
Accuracy over temperature range (measurement range depends on model)
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 (Uin 24 VDC) RS-232 max. 25 mA
Uout 2 x 0 ... 1 V/0 ... 5 V/0 ... 10 V max. 25 mA
Iout 2 x 0 ... 20 mA max. 60 mA
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 RL < 500 ohm
0 ... 1 V output RL> 2 kohm
0 ... 5 V and 0 ... 10 V outputs RL> 10 kohm
Max. wire size 0.5 mm2 (AWG 20) stranded wires recommended
Digital outputs RS-232, RS-485 (optional)
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) 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
LCD with backlight, graphic trend display
of any parameter
English, Chinese, Japanese, Spanish, German,
French, Swedish, Russian, Finnish
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)

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