The Fifth meeting of the Pacific Meteorological Council (PMC-5) will showcase the innovative MeteoHelix® micro-weather stations

MeteoHelix® weather station monitoring a beach

With the fifth meeting of the Pacific Meteorological Council (PMC-5) in Apia, Samoa quickly approaching, BARANI DESIGN Technologies team has set off to showcase the latest meteorological technology to the PMC's NHMS members and senior government officials from SPREP member countries. Additionally, their development partners, Council of the Regional Organisations in the Pacific (CROP), United Nations' agencies, collaborating organisations and institutions with also be present to discuss mitigation strategies of accelerated global warming and the adoption of early warning weather monitoring systems.

BARANI DESIGN Technologies will showcase the MeteoHelix® weather stations which are capable of surviving impacts of flying debris as found in cyclones. Being the only professional weather station to be able to survive such conditions while meeting WMO requirements for precision and accuracy of measurement, makes the MeteoHelix® IoT Pro a one of a kind proposition for island nations most affected by climate change.

The hydrometeorological equipment exhibition will be held on 5 - 9th August 2019 alongside the PMC-5 and is organized by Varysian.

HMP155 & sensor response time effect on measurement error

Its worth noting that the temperature time constant listed for the HMP155 is at a hefty 3 m/s airflow speed as shown in the photo from its manual. Thus the HMP155 temperature time constant converted to still air will, unfortunately, be significantly higher and hence the HMP155 temperature measurement error due to fluctuating air temperature will NOT be per WMO recommended guidelines as specified in the WMO – The CIMO Guide – Guide to Meteorological Instruments and Methods of Observation, 2014 Edition updated in 2017.

Due to the slow time response of this temperature sensor, an air temperature fluctuation of 2 °C over a period of 2 minutes in 3 m/s airflow will show a measurement error of 0.29 °C (at 3 m/s air speed) on top of the basic sensor accuracy/uncertainty.

Flow obstruction caused by a radiation shield will significantly increase this error for low wind speeds. Despite the status quo, it will be very hard to justify the HMP155’s use for precision climatic measurement. In 1 m/s air, the time constant can rise to 35 seconds and in 0.5 m/s air to 49 seconds, thus producing errors over 0.5 °C due to only the sensor’s slow response time.

• To reduce most air temperature errors due to sensor response time below 0.2 °C a sensor time constant of 13 seconds is required for air speeds of <1 m/s.

• To reduce the errors below 0.1 °C a τ63.2 % time constant of 7 seconds is required for air speeds of <1 m/s.

• The above values were calculated using the online Web calculator at the following link:

  • Influence of sensor response time (τ 63.2%) on climatic temperature measurements

• Below results were calculated using the Web calculator for sensor step response at this link:

  • Calculation of sensor stabilization time for climatic temperature measurements with heated humidity sensors

Monitoring climate change in the South Pacific while helping local agriculture

BARANI MeteoHelix® weather station in the South Pacific with a RainWise rain gauge. ( Image: Nouvelle station petit by https://repair.nc)

As part of a pilot project on water management started in July 2018 in New Caledonia in the South Pacific, the MeteoHelix® IoT Pro weather stations connected through the wireless Sigfox network will provide critical weather information at never before possible all-weather accuracy. The quality of weather information supplied by the new MeteoHelix® weather stations is such, that it will be able to be used for climatological monitoring of global warming in addition to its primary use for water management and agriculture. The weather stations were supplied by http://www.iot.nc, a leader in IoT development in the South Pacific.

If you wish to contribute and give your ideas for the development of this application, please contact the REPAIR team below:

https://repair.nc/actualites/
tel: +687 27 21 88
contact@repair.nc

Repair.nc
Complexe commerciale La Belle Vie
6ème km
Bâtiment BCI, 2ème étage
98800 Nouméa BP 27098

MeteoHelix® IoT Pro micro weather stations are distributed by http://www.iot.nc​ in New Caledonia. Please email contact@iot.nc for more information.