• Barometric pressure, humidity and temperature measurement in one transmitter
• Available with two barometric pressure sensors - added reliability
• RS-232C serial interface with NMEA protocol for GPS use
• Graphical display of measurement trends and over four-year history
• 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

One transmitter, three measurements
The Vaisala Combined Pressure, Humidity and Temperature Transmitter PTU300 measures barometric pressure in two accuracy classes, humidity, and temperature. You can choose which probe best suits your needs: PTU301 for laboratories, PTU303 for outdoor use, the warmed PTU307 probe for demanding meteorology, and PTU30T for pressure and temperature only.

Vaisala proven sensor
technology 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.

Graphical trend display
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

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 PTU300 to a PC.

Flexible calibration
A quick, one-point field calibration for humidity can easily be done using the Vaisala Hand-Held Humidity Meter HM70.

Serial communication
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.

Outdoor installation kit
The optional HMT330MIK Installation Kit is available for outdoor installation. It provides reliable measurements for meteorological purposes.

The display also shows the WMO pressure
trend ΔP 3h and tendency of 0 ... 9.