Product code: WSMETPAK2
Measuring wind speed and direction, temperature, relative humidity, dew point and barometric pressure, the MetPak with integrated WindSonic sensor offers unparalleled durability and accuracy. In a single lightweight unit, it is the optimum solution for research and environmental professionals and serious weather enthusiasts.
The WindSonic sensor with ultrasonic technology provides extremely accurate and reliable wind data. With no moving parts, the sensor is virtually maintenance free and easy to install - ideal for isolated locations and harsh environments.
Temperature and humidity is measured using a Rotronic Hygroclip HC2-S3 probe placed in a naturally aspirated radiation shield. Barometric pressure is measured within a durable UV Stabilised white thermoplastic vented enclosure.
The MetPak weather station is supplied with digital SDI-12, RS232 & 422 outputs.
You can link your MetPak to our WeatherFile.com website which delivers a clean and clear display of your weather data in real time.
The MetPak is also available as a base station with optional remote wind sensor.
|MetPak Weather Station Measures|
• Wind speed
• Wind direction
• Air temperature
• Relative humidity
• Barometric pressure
• Dew point
|Units of Measurement|
• knots, m/s, km/h, mph, ft/min
• °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
|MetPak Weather Station Benefits|
• Lightweight, compact and durable complete weather station
• 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
• Easily pole mounted
• Low power consumption for remote monitoring
• Emergency response
• Pollution control and plume modelling
• Weather Forecasting
• Environmental monitoring
• Industrial controls
• Road Weather Stations
• Coastal Weather Stations
• Sports stadium and outdoor events
• HVAC & Building Automation Control
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.
|The MetPak default serial output is as follows:|
|Data Connection||Data Bits 8, Parity None, Stop Bits 1, Flow Control None|
|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|
|Message terminator||Carriage return and line feed|
|Power up message||On|
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
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.
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 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.
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||370mm height (overall)
290mm standoff (max) from face of mounting pole
|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||Wind speed||Range||0.01 to 60 m/s (0.02 to 116 knots)|
|Accuracy||±2 % @ 12m/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|
|Units of measure||°C, °F or K|
|Relative humidity||Range||0-100% RH|
|Accuracy||± 0.8% @ 23°C|
|Units of measure||% RH|
|Barometric pressure||Range||600-1100 hPa|
|Units of measure||hPa. mbar, mmHg, InHg|
|Dew point||Accuracy||± 0.15°C @ 23°C ambient temp and 20°C dew point|
|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|
|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|
|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
|MetPak Weather Station Data Sheet - Issue 2|
|MetPak Weather Station User Manual - Issue 9|
|MetPak Base Station User Manual - Issue 2|
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