Product code: WSMETPAKPRO
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.
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 MetPak Pro 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.
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.
The MetPak Pro is also available as a base station with optional remote wind sensor.
|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 Benefits|
• Compact unit
|MetPak Pro Weather Station Measures|
• Wind speed
|Units of Measurement|
• knots, m/s, km/h, mph, ft/min
• Wind Speed ±2% of reading @ 12m/s
• Speed 0.01 to 60 m/s (116 knots)
• Golf Club Weather Monitoring & Club Safety
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.
To change the setting of a MetPak Pro weather station from the default factory settings, it is possible to communicate with the instrument direct from a PC.
• 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
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||361mm height (overall)
270mm standoff (max) from face of mounting pole
|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)|
|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|
|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, 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, 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
<26 mA (output 1second) @ 12 V
|SDI-12||12 V nominal (9.6 to 16 V dc)
< 12 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|
|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