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MetPak RG Base Station MetPak RG Base Station
Designed & manufactured in the UK

MetPak RG Base Station


£ inc VAT

Add Tipping Bucket Rain Gauge @ £

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

MetPak RG Base Station

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

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The MetPak RG base station is capable of monitoring seven weather parameters:

• Precipitation (with additional rain gauge)
• Barometric pressure
• Air temperature
• Humidity
• Dew point
• Wind speed (with additional wind sensor)
• Wind direction (with additional wind sensor)

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

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

WindSonic - 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
WindMaster - 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

The MetPak RG weather station is supplied with digital SDI-12, RS232 & 422 outputs.

The serial data output is ideal for interfacing with a WS-15A Display Unit.

Data from the MetPak RG can be stored using the SpaceLogger W10 (WindLogger) and SpaceLogger W8 Wireless data loggers providing a compact affordable logging solution for long term data collection.

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.

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

For the complete MetPak RG weather station with an integrated WindSonic ultrasonic wind sensor for wind speed and direction measurement, and a tipping bucket rain gauge for precipitation measurement., see MetPak RG Weather Station.

MetPak RG Base Station Benefits

• Compact unit
• Option for an ultrasonic wind sensor mounted remotely
• Includes 10m cable to connect a remote wind sensor
• Configurable
• Serial data output options
• Lightweight
• Easily pole mounted
• Low power consumption for remote monitoring

MetPak RG Base Station Measures

• Precipitation (with additional rain gauge)
• Barometric pressure
• Air temperature
• Humidity
• Dew point
• Wind speed (with additional wind sensor)
• Wind direction (with additional wind sensor)

Units of measure

• knots, m/s, km/h, mph, ft/min
• degrees
• °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 RG can be configured using the free MetView software provided to select the output rate and units of measurement that suit the application.

The MetPak RG automatically transmits a status code with each output to indicate the operating status of each of the sensors. This ensures accuracy and reliability.

The MetPak RG default serial output is as follows:

The MetPak default serial output is as follows:
Setting Function
Comms Levels RS232
Baud Rate 19200
Data Connection Data Bits 8, Parity None, Stop Bits 1, Flow Control None
Output rate 1Hz
Message Mode Continuous
Message Format Wind Direction (degrees), Wind Speed (metres/Sec), Barometric Pressure (hecto pascals), Humidity (percent), Temperature (degrees C), Dew Point (degrees C), Power Supply (volts), Status Code (00) Checksum (hex number)
Output Sentence Comma Separated Variable
Node Address Q
Message terminator Carriage return and line feed
Power up message On

Example Data String:


Q is the anemometer identifier. Can be set to any character Q to Z
DDD wind direction in degrees relative to sensor axis
SSS.SS wind speed
PPPP.P barometric pressure
HH.H relative humidity
T.T temperature
WW.W dew point
VV.V power supply voltage
AA status 00 ok, 01 anemometer axis 1 failed, 02 anemometer axis 2 failed, 04 anemometer axis 1 & 2 failed, 08 NVM error, 09 ROM error, 67 Temp/Humidity/Pressure or anemometer reading failed.
CC checksum Exclusive OR of all characters between <STX> and <ETX> as a two character hexadecimal value.
<STX> is the ASCII character with a value of 2
<ETX> is the ASCII character with a value of 3
<CR> is the ASCII carriage return character with a value of 13
<LF> is the ASCII line feed character with a value of 10

Details of other output options and configuration instructions are given in the user manual supplied with MetPak.

Configuring the MetPak RG

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 RG 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. 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 190mm height (overall)
290mm standoff (max) from face of mounting pole
142mm width
Weight 1.2 kg (including bracket)
Mounting Vertical pipe mounting 30mm to 58mm diameter
Material UV Stabilised white thermoplastic with anodised  aluminium mounting bracket
Performance Air temperature Range -35°C to +70°C
Accuracy ± 0.1°C
Resolution 0.1°C (0.1°F)
Units of measure °C or °F
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 (Not included)
Temperature, relative humidity & dew point Pt100 1/3 class B. 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
Precipitation Aerodynamic Tipping Bucket Rain Gauge (Not included)
Outputs Digital outputs RS232, RS422, RS485 (2 wire point to point) or SDI-12
Baud rates 1200 (SDI-12) - 4800-57600 (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, precipitation, 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
<16 mA (output 1second) @ 12 V
SDI-12 12 V nominal (9.6 to 16 V dc)
< 6.5 mA low power operation
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
Miscellaneous Calibration Factory calibrated
Software MetSet & MetView - free software providing the means for configuring the MetPak, MetPak RG and MetPak Pro and for reading output data

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