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MetPak™ Pro Base Station
Designed & manufactured in the UK

MetPak Pro Base Station


£ inc VAT

Add Tipping Bucket Rain Gauge @ £

Remote sensor:
Include WindSonic @ £ inc VAT
Include Heated WindSonic M @ £ inc VAT

Professional Weather Station

MetPak Pro measures the same range of weather parameters as the MetPak with the additional ability to connect up to four external measurement devices.

The system combines the proven WindSonic ultrasonic wind speed & direction sensor, a highly accurate barometric pressure sensor housed in a vented enclosure and a Rotronic Hygroclip temperature/humidity probe contained in a naturally aspirated radiation shield to maximise measurement accuracy.

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MetPak Pro contains a PCB allowing users to conveniently add additional parameters using industry standard formats. Additional inputs allow for connection of a Pt100 temperature sensor, tipping bucket rain gauge (available from R-P-R) and two analogue sensors (water level sensor, pyranometer, pressure sensor, soil temperature sensor etc).

The serial data output is ideal for interfacing with a WS-15A Display Unit or for data logging to a SpaceLogger WindLogger.

The MetPak RG weather station is supplied with digital SDI-12, RS232 & 422 outputs. Low power consumption enables this weather station instrument to be used in remote locations where power is at a premium. An electrical junction box is fitted to the mounting bracket allowing convenient termination of all electrical cables.

MetPak Pro Base Station

MetPak Pro is available as a Base Station which enables the system to be specified with a remote wind sensor if required. This sensor can be positioned away from the Base Station and a connection cable is provided.

The Base Station has been tested in accordance with BSEN 60945 and is suitable for use in marine environments. This system, which includes inputs for a Pt100 temperature sensor, tipping bucket rain gauge and two analogue sensors, can also be specified without a wind sensor if wind measurement data is not required.

The MetPak Pro base station can be specified with a remote sensor from any of the options below:

For wind speed and direction measurements to 60 m/s. Corrosion free, polycarbonate housing

WindSonic M
Wind speed and direction measurements to 60 m/s with heating and impact resistant to UL2218 Class 1 & BSEN 60945

WindObserver 70
With enhanced heating and wind measurements up to 70 m/s for extreme conditions

Three dimensional wind measurements up to 45 m/s in a lightweight carbon fibre/aluminium construction

WindMaster Pro
Three dimensional wind measurement up to 65 m/s in a stainless steel housing

Rain Gauge
ARG100 Professional quality tipping bucket Rain Gauge

An optional heater interface box is available for ease of connection for remote heated wind sensors.

An optional MetPak Pro junction box allows an alternative method to connect the sensors to the base station in a convenient separate box.

MetPak Pro with Integrated WindSonic

This variant of the MetPak Pro features the same on-board sensors as the Base Station, with an integrated WindSonic ultrasonic wind sensor for high accuracy wind speed and direction measurement. This unit also features inputs for up to four external measurement devices including the precision tipping bucket Rain Gauge.

MetPak Pro weather station features

• Wind Speed & Direction
• Temperature
• Humidity
• Barometric Pressure
• Dew Point
• 2 Analogue inputs, suitable for water level sensor, pyranometer, pressure sensor, soil temperature sensor etc
• Pt100 Input
• Digital Input (tipping bucket rain gauge)
• Gill ASC11 Output
• SDI-12 Output
• Rugged Professional Design

MetPak Pro weather station benefits

• Compact unit
• Ultrasonic wind sensor with no moving parts
• Low start up wind speed (0.01 m/s)
• True 0 to 360° operation
• Serial data output options
• Lightweight
• Easily pole mounted
• Easy plug in for additional inputs
• Low power consumption for remote monitoring

MetPak Pro Weather Station measures

• Wind speed
• Wind direction
• Air temperature
• Relative humidity
• Dew point
• Barometric pressure

Units of measure

• knots, m/s, km/h, mph, ft/min
• qdegrees
• °C or °F
• % RH
• hPa, mbar, mmHg, InHg


• Wind Speed ±2% of reading @ 12m/s
• Wind Direction ±3° @ 12 m/s
• Air temperature ±0.1°C
• Relative humidity ±0.8% @23°C
• Barometric pressure ±0.5hPa


• Speed 0.01 to 60 m/s (116 knots)
• Direction 0 to 359° (no dead band)
• Temperature -35°C to +70°C
• Relative humidity 0-100% RH
• Barometric pressure 600-1100hPa


• Golf Club Weather Monitoring & Club Safety
• HVAC & Building Automation Control
• Agricultural Weather Station
• Government & Emergency Management
• Education & Environmental Research
• Pollution Control
• Weather Forecasting
• Power and Smart Grid Solutions
• Sports & Recreation Environmental Observation
• Transport & Aviation Weather Monitoring
• Environmental monitoring
• Industrial controls
• Road Weather Stations
• Coastal Weather Stations

What Does It Output?

MetPak Pro can be configured using the free MetView software provided to select the output rate and units of measurement that suit the application.
The MetPak Pro automatically transmits a status code with each output to indicate the operating status of each of the sensors. This ensures accuracy and reliability.

Advantages of WindSonic ultrasonic sensors over conventional anemometers

• No moving parts - no bearings to wear or require replacement
• Very low start up speed
• 0 to 360° operation - no dead band
• Single robust sensor
• Designed to withstand a 1m drop test
• No calibration
• Low cost of ownership
• 2 year warranty

Configuring the MetPak

To change the setting of a MetPak weather station from the default factory settings, it is possible to communicate with the instrument direct from a PC.

MetPak can be configured using:

• A terminal program such as MS Windows HyperTerminal
• MetSet Configuration Software: MetSet is a free software package that allows the user to configure the output and display data provided by the MetPak II. The simple interface features a range of drop-down selection boxes, providing the ability to enable or disable existing sensors and adjust output rates.

MetView software

MetView software is also provided free with each weather station, offering a clear, intuitive display of the current weather conditions.

MetView features five gauges: Temperature, Humidity, Pressure, Wind Speed and Wind direction. There is also a digital readout of Dew Point.

How Ultrasonic Wind Sensors Work

The WindSonic sensor uses the time of flight method of air velocity measurement.

There are four ultrasonic transducers arranged as two pairs at right angles to each other. Each pair is used to measure the component of the wind in the direction between the transducers.

For example if one pair is on a North South line and the other pair is on an East West line then the North South component VN and the East West component VE are measured. These are then combined to give the actual wind speed and direction.

Wind angle  A = arctan ( VE / VN )

Wind speed  S = sqroot ( VE 2 + VN 2 )

To look at how the component measurements are done we will take the example of the North South transducer pair:

A pulse of ultrasonic sound is transmitted by the North transducer and the time T1 it takes to travel to the South transducer is accurately measured. The time T2 is then measured for an ultrasonic pulse to travel in the opposite direction from the South transducer to the North transducer. These times are affected by the wind blowing along the line between the transducers. For example if there is some wind blowing from a Northerly direction, then the time taken for the ultrasonic pulse to travel from N to S will be shorter than from S to N.

The time for the pulse to travel from N to S is given by

T1 = L / ( C + VN )

and the time for the pulse to travel from N to S is given by

T2 = L / ( C - VN )

L is the distance between the transducers and
C the speed of sound

From this the northerly component of the wind can be found from

VN = L ( 1/T1 - 1/T2 ) / 2

and the speed of sound from

C = L ( 1/T1 + 1/T2 ) / 2

Physical Dimensions 361mm height (overall)
270mm standoff (max) from face of mounting pole
142mm width
Weight 2.1 kg (including bracket)
Mounting Vertical pipe mounting to 30mm to 58mm diameter mast
Material UV Stabilised white thermoplastic with anodised aluminium mounting bracket
Performance Wind speed Range 0.01 to 60 m/s (0.02 to 116 knots)
Accuracy ±2 % @ 12m/s
Resolution 0.01 m/s (0.02 mph)
Threshold 0.01 m/s
Units of measure m/s, knots, mph, km/hr, ft/min
Wind direction Range 0 to 360° (no dead band)
Accuracy ±3° @ 12m/s
Response time 0.25 sec
Air temperature Range -35°C to +70°C
Accuracy ± 0.1°C
Resolution 0.1°C (0.1°F)
Units of measure °C, °F or K
Relative humidity Range 0-100% RH
Accuracy ± 0.8% @ 23°C
Resolution 0.1% RH
Units of measure % RH
Barometric pressure Range 600-1100 hPa
Accuracy ±0.5hPa
Resolution 0.1hPa
Units of measure hPa. mbar, mmHg, InHg
Dew point Accuracy ± 0.15°C @ 23°C ambient temp and 20°C dew point
Resolution 0.1°C (0.1°F)
Units of measure °C or °F
Sensors Wind speed & direction WindSonic ultrasonic sensor
Temperature, relative humidity & dew point Rotronic HygroClip model HC2-S3 compensated for temperature dependency.
Radiation shield 6-plate naturally aspirated
Barometric pressure Solid state device compensated for temperature dependency -20°C to +70°C
Inputs Analogue 1 0-5V or 4-20mA loop or self powered
Analogue 2 0-5V or 4-20mA loop or self powered
MetPak Pro A-D Conversion 12 bit resolution with an accuracy of ± 0.1% of reading +35µV offset
Pt100 temperature probe 4 wire Pt100 conforms to IEC 60751
Digital Contact closure for tipping bucket rain gauge capable of capturing events up to 10Hz
Outputs Digital outputs RS232, RS422 or SDI-12
Baud rates 1200 (SDI-12) - 9600-57600 (ASCII RS232, RS422)
Protocols ASCII or SDI-12 V1.3
Output rate 0.25, 0.5, 1 Hz or polled mode
Parameters output Polar wind speed and direction or U & V vectors, barometric pressure, humidity, temperature, dew point, power supply voltage, MetPak status code, checksum
  click on the Overview tab for details of the default serial output
Power Power requirements RS232, RS422 5 to 30 V dc
36 mA (output 1second) @ 12 V
SDI-12 12 V nominal (9.6 to 16 V dc)
< 36 mA
Environmental Temperature Operating range: -35°C to +70°C
Storage range: -40°C to +80°C
Humidity Operating range: 0% to 100% RH
Protection Class IP65
EMC EN 61326
Miscellaneous Calibration Factory calibrated
Software MetView - Free software for the display of data and logging
MetSet - Free software for the configuration of the MetPak, MetPak RG & MetPak Pro

The manufacturer reserves the right to amend the specification and therefore the information in this document may be subject to change

Case Studies

Our following Case Studies give an overview of how this product applies to different sectors.
Please click on the title below to read the full case study.

Agriculture Agriculture
Aviation Aviation
Construction Construction
Education Education
Emergency Services Emergency Services
Environmental Monitoring (with SpaceLogger Data Loggers) Environmental Monitoring (with SpaceLogger Data Loggers)
Environmental Monitoring (with Wind Systems) Environmental Monitoring (with Wind Systems)
Health & Safety Monitoring Health & Safety Monitoring
Marine, Ships & Harbours Marine, Ships & Harbours
Outdoor Sports Outdoor Sports
Research Research
Tower Cranes Tower Cranes
Transport Safety Transport Safety
Weather Weather