HMT333 Humidity and Temperature Transmitter with Remote Probe, Modbus RTU, 1%RH accuracy - Vaisala Online Store

/ Online Store

Your location
appears to be United States.

HMT333 Humidity and Temperature Transmitter with Remote Probe, Modbus RTU, 1%RH accuracy

The HMT333 is the top-of-the-line versatile instrument for applications where a small remote probe is needed. It supports Modbus RTU. The Vaisala HUMICAP® Humidity and Temperature Transmitter HMT330 series incorporates Vaisala’s 40 years of experience in industrial humidity measurement.The instrument offers a wide variety of different psychrometric units, including dew point, enthalpy, wet bulb temperature, absolute humidity, and mixing ratio.

The transmitter has a keypad and a large graphical display for convenient monitoring of the reading and transmitter setting changes. For example both output signal type (voltage or current) and scaling can easily be changed by the user.

See other HMT330-series transmitters
Field check and adjust your transmitter using a HM70 humidity meter

Vaisala offers a 10-year warranty for new HMT333 transmitters that are calibrated annually at a Vaisala Service Center. Please see the details on our web page and the conditions of the 10-year warranty.

Galvanically isolated RS485 interface supporting Modbus RTU protocol.

Two Analog outputs are preset at the factory to:

  • Channel 1: 4…20 mA = 0...100% RH
  • Channel 2: 4...20 mA = -40...+80°C (-40...+176°F) T

The package includes:

  • Compact probe with 2 m (6.5 ft) cable
  • Calibration certificate (ISO9001 compliant, traceable)
  • M20x1.5 cable gland and NPT1/2" conduit fitting included to facilitate wiring
  • User's Guide in English

HMT333 Humidity and Temperature Transmitter with Remote Probe, Modbus RTU, 1%RH accuracy
HMT330 series: HMT333 Humidity and Temperature Transmitter (calculates Dewpoint, Absolute humidity, Wet Bulb temperature, Mixing ratio and Enthalpy) with Remote Probe, supports Modbus RTU
Standard delivery time for single unit: 1 week
About delivery times »
Warranty: 24 months, extended to 10 years if calibrated annually at a Vaisala service center
About warranty »
Choose Probe cable length

Part no. Choose options first

Quantity Price

Detailed information

Measurement parameter(s)Relative humidity
Absolute humidity
Dew point temperature
Mixing ratio
Water vapor pressure
Wet bulb
Measurement range0 ... 100 % RH
-40 ... +80 °C (-40 ... +176 °F) T
Measurement accuracy±1.0 % RH (0 ... 90 % RH)
±1.7 % RH (90 ... 100 % RH)
±0.2 °C (±0.36 °F) T
Operating temperature-40 ... +80 °C (-40 ... +176 °F)
Operating voltage10 ... 35 VDC, 24 VAC ±20%
Analog outputs4 ... 20 mA (default setting)
0 ... 20 mA
0 ... 1 V
0 ... 5 V
0 ... 10 V
Digital outputsModbus RTU over RS485
Housing classificationIP65 (NEMA 4)
Links See full specifications on
Download user guides and other product documents on

Did not find products or accessories and spares parts you were looking for?
Online Store has a limited selection of our products. See our full product offering»
Discuss your specific needs with our knowledgeable Sales Engineers. Find your local sales contact»

Shopping cart
Total 0,00 €

About the Online Store

Contact Us

Payment Methods

Trusted Commerce