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Vaisala HMT330 Series Humidity and Temperature Transmitter

condition: Brand NewPart #: VA-HMT330Availability: Out of StockInfo Message: DISCONTINUED ITEM
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DISCONTINUED ITEM-Recommended Replacement: Vaisala Indigo 520 Transmitter

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. HMT330 is also capable in applying the MODBUS communication protocol and together with an appropriate connection option provides either MODBUS RTU (RS485) or MODBUS TCP/IP (Ethernet) communication.

  • Six models for demanding industrial applications

-HMT331 for wall mounting
-HMT333 for duct mounting and tight spaces
-HMT334 for high pressures up to 100 bar and vacuum conditions
-HMT335 for high temperatures
-HMT337 for high humidity and meteorological applications
-HMT338 for pressurized pipelines up to 40 bar

  • 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
  • Outdoor Measurement
  • Cleanroom Measurement and Monitoring
  • Metrology/Calibration Labs
  • Measurement and Monitoring in Test Chambers
  • Measurement and Monitoring in Incubators
  • Measuring Dew Point in Compressed Air
  • Controlling Humidity Level in Bakeries
  • Measuring Dew Point in Furnace Gas
  • Measuring Humidity of Air Exiting from the Hood

Relative Humidity Measurement

Measurement Range 0 … 100 % RH
Accuracy at +20 °C (68 °F) ± 1.0 % RH (0 … 90 % RH)± 1.7 % RH (90 … 100 % RH)
Sensor Vaisala HUMICAP® 180

Vaisala HUMICAP® 180R


Temperature Measurement

Measurement Range
HMT331 -40 … +60 °C (-40 … +140 °F)
HMT333 -40 … +80 °C or  -40 … +120 °C

(-40 … +176 °F or -40 … +248 °F)

HMT334/335/337/338 -70 … +180 °C (-94 … +356 °F)
Sensor PT100 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.


Operating Environment

Temperature for Probe Same as measurement ranges
Temperature for Transmitter Body -40 …+ 60 °C (-40 … +140 °F)
Temperature for Transmitter Body with Display 0 …+ 60 °C (+32 … +140 °F)
Pressure HMT334 0 … 10 MPa (0 … 100 bar)
Pressure HMT338 0 … 4 MPa (0 … 40 bar)
Pressure HMT333/335/337 vapor tight


Inputs and Outputs

Operating Voltage with Optional Power 10 … 35 VDC, 24 VAC
Operating Voltage with Supply Module 100 … 240 VAC 50/60 Hz
Power consumption @ 20 °C (Uin24 VDC)
RS-232 max. 25 mA
Uout2 x 0 … 1 V/ 0 … 5 V/0… 10 V max. 25 mA
Iout2 x 0 … 20 mA V max. 60 mA
Analog Current Output 0 … 20 mA, 4 … 20 mA
Analog Voltage Output 0 … 1 V, 0 … 5 V, 0 … 10 V
Digital Outputs RS-232, RS-485 (optional)
Ethernet interface (optional) 10/100Base-T
Supported standards RJ45
Connector Telnet
WLAN Interface (optional) 802.11b
Supported Standards RP-SMA
Antenna Connector Type Telnet
Protocols WEP 64/128,WPA
Authentication / Encryption
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
Menu Languages English, French, Spanish, German, Japanese, Russian, Swedish, Finnish, Chinese



Probe Cable Diameter
HMT333 6.0 mm
Other Probes 5.5 mm
Material (housing) G-AlSi 10 Mg (DIN 1725)
Housing Classification IP65 (NEMA 4)
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