Transmitters for weather / wind speed and direction


  • 1 x built-in barometric pressure
  • Range: 800-1100mBar
  • Resolution: 1mBar
  • Accuracy: +/-3 mBar


The TMET weather transmitter interfaces digitally with the Vaisala WXT536 weather sensor or or Vaisala WXT532 wind speed sensor. The Vaisala WXT536 weather sensor supplies the following parameters:

  • Wind speed: 0-60m/s
  • Wind direction: 0-360°
  • Precipitation
  • Barometric pressure: 600-1100 hPa
  • Air temperature: -52°C to 60°C
  • Relative Humidity: 0-100%RH


The transmitter also has inputs for a thermistor temperature sensor and a pyranometer input for the Kipp and Zonen CMP3 or Skye SKS1110. The pyranometer channel provides Global (Total) and Diffuse irradiance in W.m-2.

TMET cannot provide wind gust data or sunshine hours.


Standard Options

Powering the TMET

The TMET and the Vaisala weather sensors are both low power devices, allowing the system to be powered by any of the following: Solar power The built in rechargeable battery and solar regulator used together with a 9W solar panel provides up to 5 days of continuous operations in the absence of significant sunlight (based on a transmitter interval of 5 minutes). AC power supply Use with a Eltek power supply type MP12U (mains input voltage 100/250V ). The internal rechargeable batteries provide several days of power should the AC supply fail. External 12V battery e.g. Yuasa sealed acid battery (12AH). Provides up to 3 weeks operation. Note: the above power options are not suitable for use with the Vaisala weather sensor if the de-icing option is required.


The TMET powers the weather senors. The pyranometer is self-powered.



The TMET is rated for indoor use only. If to be used outdoors, the TMET must be housed in a secondary enclosure. The outdoor unit type WBT is available for this purpose. The WBT is intended for mounting on a 25mm lightweight aluminium pole.

Supplied with key-lock door and galvanised clamp for use on the 25mm dia pole. (The pole is not supplied).

Dimensions: 200 x 300 x 132mm




10W solar panel supplied with 25mm dia pole mounting bracket and lead. Charge rate is 1A max.
The bracket fitted provides fixed inclination of 30 degrees and is optimised for latitude 52 degrees north. For extremes of latitude an alternative bracket may be required.



WBG Wall bracket docking kit

This kit enables fitment of the transmitter's built-in wall bracket to difficult or uneven surfaces. The kit provides additional docking security.

The following products are supported:

  • All GD, GC, GL and GS series transmitters
  • RP250GD repeater and RC250 receiver


Transmitter Specification

Model(s) Sensors Range Resolution Accuracy
TMET 1 x u type thermistor input -50 to 150°C 0.05°C (-5 to +75°C)
0.1°C (-25 to +100°C)
0.2°C (-40 to +125°C)
±0.1°C (-5 to +75°C)
±0.2°C (-25 to +100°C)
±0.4°C (-40 to +125°C)
  1 x voltage input for use with external device e.g. solarimeter┬átypes Kipp and Zonen CMP3 or Skye SKS1110 0-50mV 0.025% 0.1%
  1 x serial input for connection to Vaisala WXT536 or WXT532 The TMET transmitter interfaces digitally with the Vaisala WXT536 to derive:
Windspeed: 0-60m/s
Wind direction: 0-360°
Barometric pressure: 600-1100 hPa
Air temperature: -52°C to 60°C
Relative Humidity: 0-100%RH
Frequency: Default is 434.225Mhz (other frequencies are available)
Tx output power: 10mW ERP
Useable Tx interval: typically 10 seconds to 15 minutes
Size: 120 x 120 x 55mm (excluding antenna)
Weight: 560g
Connection strip: Standard 5mm pitch rising cage connector (included)
Antenna "TMET": Supplied compressed spring, L=70mm, modified SMA base
Gain: -3db
Antenna connector: SMA socket is mounted on the TMET
Fixing: 4 x 4mm dia holes (fixing screws are NOT provided)
Battery type: customised (7.2v) 2.3Ah Ni-mH with built in temperature sensor
Battery endurance: typically > 5 days if battery fully charged and with Vaisala connected
Charging time: Using MP12U: typically 8 hours from discharged
Using SPTMET typically from discharged 1 day of full sun.
Max lead length to any connected sensor is 10m.

Common GenII Transmitter Specification

RF specification: EN300-220
RF power: 10mW
Environment specification  
  Compliant to EN300-220: -10 to +55°C
  Actual: -30 to +65°C
  Humidity: 100% non condensing
Environmental rating: IP40
Dimensions (footprint): 78 x 41mm
Transmission interval range: 1 sec to 4 hours
Indicator (red LED): transmit active/on/off
Control switch (concealed): test mode / hibernate
Antenna socket: SMA


Common to all transmitters

Gen II Quick Start Instructions

Specific to this family of transmitters


TMET Datasheet

User Instructions:

TMET User Instructions