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

MetPak Base Station

Product code: WSMETPAKBASE

£ inc VAT

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

MetPak 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 10 m 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 can also be specified without a wind sensor if wind measurement data is not required.

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The MetPak base station is a compact and lightweight multi-sensor meteorological instrument that measures a wide range of weather parameters.

• Temperature
• Relative Humidity
• Dew point
• Barometric Pressure

Temperature and humidity are measured using industry standard probes housed in a naturally aspirated radiation shield. Barometric pressure is measured within a vented enclosure.

The MetPak 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

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

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

The MetPak 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.

For the complete MetPak weather station with integrated WindSonic sensor, see MetPak Weather Station.

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

MetPak Base Station measures
• Air temperature
• Relative humidity
• Dew point
• Barometric pressure

Units of measure
• °C or °F
• % RH
• hPa, mbar, mmHg, InHg

• Air temperature ±0.1°C
• Relative humidity ±0.8% @23°C
• Barometric pressure ±0.5hPa

Range • Temperature -35°C to +70°C
• Relative humidity 0-100% RH
• Barometric pressure 600-1100hPa

• Environmental monitoring
• Industrial controls
• Road Weather Stations
• Coastal Weather Stations

What does it output?

MetPak can be configured using the free MetView software provided to select the output rate and units of measurement that suit the application.

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

For details of the MetPak default serial output, click here

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.

Default Serial Output from MetPak

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: <STX>,Q,DDD,SSS.SS,PPPP.P,HH.H,T.T,WW.W,VV.V,AA,<ETX>,CC<CR>,<LF>

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.

Physical Dimensions 370mm height (overall)
290mm standoff (max) from face of mounting pole
142mm width
Weight 1.1 kg (including bracket)
Mounting Vertical pipe mounting 25mm to 50mm diameter
Material UV Stabilised white thermoplastic with gloss white painted aluminium mounting bracket (with moulded plastic V-block and stainless steel U-bolt)
Performance 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 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
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
Miscellaneous Calibration Factory calibrated
Software MetView - free software providing the means for configuring the MetPak II and reading output data

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