Starting at $2,398.00

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  • Barometric pressure, humidity and temperature measurement in one transmitter
  • Available with two barometric pressure sensors - for added reliability
  • RS-232C serial interface with NMEA protocol for GPS use
  • Optional display, RS-485, analog output, and relay
  • Optional power supply module
  • NIST traceable calibration
  • HMT330MIK Installation kit for outdoor use
  • Applications include environmental monitoring in calibration laboratories, GPS meteorology: estimating precipitable water vapor in the atmosphere; weather stations
  • Integrated data logging, with over four years of measured history

The Vaisala PTU300 series is a versatile, multi-purpose instrument that combines pressure, humidity and temperature transmitters into a single unit. Each model of the PTU300 series includes the base station and a probe especially designed to suit specific applications. The PTU301 is ideal for laboratories, the PTU303 for outdoor use, the warmed PTU307 probe for demanding meteorology, and PTU30T for pressure and temperature measurements only.

The PTU300 transmitter uses sensors known for their high accuracy and excellent long-term stability: the Vaisala BAROCAP® is used for pressure measurement and the Vaisala HUMICAP® for humidity measurement. The temperature sensor is a platinum RTD sensor. Two classes of accuracy are available for barometric pressure reading and two barometric pressure sensors are available for added reliability.

The PTU300 series features a large numerical and graphical display allowing users to easily 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 real-time 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. The PTU300 comes with a standard RS-232 serial interface. The output format is compatible with major GPS receivers and NMEA coded messages. RS-485 is available as an option.

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 LAN interface Ethernet connection. A USB-RJ45 cable makes it easy to connect the service port of the PTU300 to a PC. PTU300 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.


Vaisala 219685 USB Cable
USB-RJ45 serial connection cable with software driver
In Stock
Vaisala 211339 Connection Cable
Connection cable for the HMT120 humidity/temperature transmitter
In Stock
Vaisala HMP247CG Cable gland AGRO


Vaisala MI70LINK Software
Vaisala MI70LINK Software with USB or serial port cable
In Stock


Please consider these optional accessories.

Vaisala 214829 Adapter Plate
Transmitter wall mount adapter plate
Vaisala 215108 Pole Installation Kit
Metal mounting plate, fixing brakets, and mounting nuts for 30 to 102mm pole or pipeline
In Stock
Vaisala 215109 Outdoor Installation Kit
Vaisala 215109 Outdoor Installation Kit
Vaisala 210697 Duct Installation Kit
Vaisala 210697 Duct Installation Kit
Vaisala DTR502B Radiation Shield
9-plate shield to protect humidity and temperature sensors from solar radiation and precipitation