Digital Weather Station with Wireless Sensors

• Purpose: continuous measurement of the state of the atmosphere for physics and geography classrooms — indoor and outdoor air temperature, relative humidity, atmospheric pressure, wind speed and direction, rainfall, illuminance and ultraviolet radiation
• Configuration: indoor main unit (receiver) and a wireless outdoor transmitter with a group of sensors
• Air temperature: indoor 0 to +60 °C, outdoor -40 to +60 °C; accuracy ±1 °C
• Relative humidity: 10 to 99 %; accuracy ±5 %
• Atmospheric pressure: 300 to 1100 hPa; accuracy ±3 hPa
• Wind speed: 0 to 50 m/s
• Wind direction: 0 to 360°
• Rainfall: 0 to 9999 mm; resolution 0.3 mm to 1000 mm and 1 mm above 1000 mm
• Illuminance: 0 to 200 000 lx; accuracy ±15 %
• Ultraviolet radiation: UV index 1 to 15+ (UV-B to UV-A); accuracy ±1 level
• Radio link to the transmitter: 433.92 MHz; range 90 m in open terrain; transmission interval 16 s; no cables between the sensors and the receiver
• Power supply: receiver — 3 × AAA 1.5 V cells; transmitter — 3 × AA 1.5 V cells and a solar panel; cells are not supplied with the product
• Main unit dimensions: approximately 170 × 125 mm

Kit Contents:

Main Unit (Receiver), Indoor

• Main unit with colour LCD and bright colour-changing backlight, approximately 170 × 125 mm, powered by 3 alkaline or lithium AAA 1.5 V cells (not supplied) — 1 pc
• Built-in indoor air temperature and relative humidity sensor, temperature 0 to +60 °C ±1 °C, humidity 10 to 99 % ±5 % — 1 pc
• Built-in atmospheric pressure sensor (barometer), 300 to 1100 hPa ±3 hPa — 1 pc

Wireless Outdoor Transmitter with Sensor Group

• Wireless outdoor transmitter with solar panel supporting its power supply, backup power 3 alkaline or lithium AA 1.5 V cells (not supplied), data transmission at 433.92 MHz every 16 s over 90 m in open terrain — 1 pc
• Outdoor air temperature and relative humidity sensor, temperature -40 to +60 °C ±1 °C, humidity 10 to 99 % ±5 % — 1 pc
• Wind speed sensor (anemometer), 0 to 50 m/s, accuracy ±3 m/s in the range 2 to 10 m/s and ±10 % in the range 10 to 50 m/s — 1 pc
• Wind direction sensor (wind vane), 0 to 360° — 1 pc
• Rain gauge, 0 to 9999 mm, resolution 0.3 mm for rainfall to 1000 mm and 1 mm above 1000 mm, accuracy ±1 mm to 15 mm and ±7 % in the range 15 to 9999 mm — 1 pc
• Illuminance sensor, 0 to 200 000 lx, accuracy ±15 % — 1 pc
• Ultraviolet radiation sensor, UV index 1 to 15+ over the UV-B to UV-A range, accuracy ±1 level — 1 pc

Display and Calculated Values on the Main Unit

• Current readings of all sensors simultaneously
• Recorded minimum and maximum values
• Dew point
• Wind chill index (temperature as felt in wind)
• Weather forecast from the barometric trend over the pressure range 300 to 1100 hPa
• Moon phases, calendar, clock with alarm
• Alarm when a reading goes outside a set upper or lower limit

Product passport: ULABS-G023 (PDF)

Preparation for Work

• Check the contents against the kit list. Inspect the main unit, the transmitter housing, the anemometer cups, the wind vane, the rain gauge funnel and the solar panel: cracks, skew and dirty sensor windows distort the readings, and damaged components must not be used.
• Fit the cells: three AAA 1.5 V cells in the receiver and three AA 1.5 V cells in the transmitter, alkaline or lithium; they are bought separately. Check the polarity against the markings in the compartment. Switch on the transmitter first and the receiver second — they establish the radio link faster this way.
• Choose a site for the transmitter: an open place away from walls, trees and heat sources that distort the temperature measurement and block the airflow. Mount the rain gauge strictly horizontally, set the anemometer cups and the wind vane so that they turn freely, and orient the solar panel to the south. Keep the distance to the receiver within 90 m in open terrain; walls, floors and metal structures reduce it.
• Place the main unit indoors in a visible spot and check that the outdoor sensor readings appear on the display. Set the current time, date and units and define the upper and lower alarm limits for the values you need.

Observation Procedure

• Current values: data from all sensors reach the main unit simultaneously every 16 s, so the display shows the state of the atmosphere practically in real time. The outdoor sensor does not react instantly — after the transmitter is taken outside or after an abrupt weather change, allow several transmission cycles for the readings to settle.
• Wind and rainfall: compare readings in calm and windy weather and relate the wind direction to changes in temperature and pressure. The rain gauge accumulates rainfall as a running total; record the reading after each rain and reset the accumulated value before a new series of observations.
• Pressure, forecast and derived values: the product measures pressure over 300 to 1100 hPa with an accuracy of ±3 hPa and builds a weather forecast from its trend. The display also shows dew point and wind chill index, calculated from the measured temperature, humidity and wind speed; use the recorded minima and maxima to follow the daily course of the values.
• Illuminance and ultraviolet radiation: compare readings at different hours and under different cloud cover, noting that the maximum UV index and the maximum illuminance do not always occur at the same moment.
• Observation log: for long-term studies record the readings at the same hours, noting date and time. Such a data series suits plotting the daily and weekly course of temperature, pressure and humidity. Do not move the transmitter in the middle of a series — the results of different days then become incomparable.

Safety

• Use only cells of the type and rating stated in the manual or on the housing; do not mix new and partly discharged cells and observe the polarity. If electrolyte leaks, remove the cells at once without touching the contents.
• Remove the cells if the product will not be used for over a month — leaking electrolyte destroys the instrument. Do not recharge non-rechargeable cells and do not throw them into fire.
• Do not open the housing and do not expose the product to impacts, moisture or direct sunlight.
• Mounting and servicing the outdoor transmitter at height is done by an adult: work in pairs, from a stable ladder, and do not involve students in this work.
• Do not install, remove or service the outdoor sensors during a thunderstorm, strong wind, rain or icing; choose a site away from power lines.
• Fasten the transmitter securely to its mast: an unsecured assembly with the anemometer and wind vane is torn off by the wind and falls from height.
• The main unit is installed indoors, protected from moisture, direct sunlight and heating appliances; it has no protection against precipitation and is not intended for outdoor installation.
• When measuring illuminance and UV index, do not look at the sun and do not point optical instruments at it.
• Do not base decisions about people's safety on the readings: this is an educational instrument and its readings do not replace official meteorological warnings.
• Students work with the product under the supervision of a teacher; recommended for learners aged 10 and older (grade 5 and up).

Operating and Storage Conditions

• Air temperature: +5 °C to +40 °C
• Relative humidity: 40 % to 60 %
• Atmospheric pressure: 84 to 107 kPa (630-800 mm Hg)
• Store in a room at +5 °C to +40 °C and relative humidity of 60 %; keep the air free of impurities that corrode metals.

Maintenance

• Wipe the main unit with a soft dry cloth; it needs no wet cleaning or detergents. Do not block the ventilation openings and do not place the unit near heating appliances — this overstates the indoor temperature reading.
• Inspect the outdoor transmitter every quarter and after every spell of bad weather. Clear the rain gauge funnel of leaves, dust and insects, otherwise rainfall is collected incompletely; check that the anemometer cups and the wind vane turn freely and keep their axles clean. Wipe the solar panel and the windows of the illuminance and UV sensors with a soft damp cloth — a layer of dust understates the readings. In winter check for ice on the anemometer cups and in the rain gauge funnel.
• Replace the cells as soon as the readings become unstable or the radio link with the transmitter is lost; fit a complete set of new cells of the same type in both units at once. For long periods out of use, remove the cells from both units, take the transmitter off its mast and move the components to a dry heated room.

Warranty and Disposal

• Warranty: 3 years, covering defect elimination and replacement of defective parts or equipment; spare parts and consumables available for 5 years.
• Compliance: the product meets the requirements of the applicable EU directives and regulations and bears the CE and WEEE markings.
• Disposal: the WEEE marking (crossed-out wheeled bin) prohibits disposal with unsorted municipal waste. Remove the cells before disposal and hand them in separately at a battery collection point; the product goes to a separate collection point for waste electrical and electronic equipment. Metal parts are recycled as scrap metal, electronic components go to specialised processing.