• Assistance > Questions about products


      What is the maximum distance I can have the remote sensor from the display?

      The maximum open-air distance is 100 meters in a straight line although you should take into account the environment, distance and interferences. Subtract 6 to 10 meters for an exterior wall or any other similar obstruction, in width or composition. Subtract 3 to 10 meters per interior wall or any obstruction that is similar in width or composition. (An obstruction would include anything that is between the line of sight like a roof, walls, floors, ceilings, trees, etc.) Also keep your units away from electronic appliances like TV’s, microwaves, computers, refrigerators and speakers.

      Does the remote transmitter have any trouble transmitting through specific materials?

      Yes and No… We have trouble maintaining a signal through metal siding, stucco walls and UV glass. You can get the remote sensor to transmit through these materials, but it will take a little bit of trial and error. Reset the weather station as mentioned above and change the angle that the remote transmits through the siding or glass until an outdoor temperature remains on the display for an extended period of time. Keep in mind that the signal from the remote must travel through some space (10 cm of air minimum) before reaching a wall or glass window.

      What do I do if my display is blank?

      Check the polarity on your batteries to make sure they are installed according to the diagram in the battery compartment. Also make sure that you are using a quality alkaline battery. We advise against reloading batteries (except for specifical product).

      Why is my time incorrect or not displaying at all?

      Most of our items receive the DCF-77 signal from Frankfurt to set the clock to atomic time. Sometimes, due to poor atmospheric conditions or local interferences you will not be able to receive a signal immediately. The best way to get a signal is to put your clock in a window facing Frankfurt until you see the tower icon appear. If definitely you are not receiving the signal, wait one night, during the night time there are less atmospheric disturbances.

      If your time is off by an increment of exactly 1 hour, 2 hours, or more change your TIME ZONE on zero not to have time zone on the atomic time (which is CET meaning Central European Time (Brussels, Paris, Rome, Berlin, Madrid... ).

      Change time zone on “-1” for Great Britain and Portugal. Match any time zone when receiving DCF-77 signal.

      What means when “OFL” instead of data is displayed?

      “OFL” is displayed when in- or outdoor temperature or humidity data are “out of range”.

      In the case of outdoor temperature and humidity “OFL” can also be displayed when any interference occurs.

      Correct data transmission is usually restored during the next data collection. If that is not the case, you should restart your station.

      Where can I mount the remote sensor?

      In order to get an accurate reading and to prolong the life of your sensor we recommend that you have it in a sheltered area out of the sun and direct rain. Fog and Mist will not affect the sensor, but a soaking in water may.

      You can mount it outside under an eve of your house or any other suitable place that will keep it out of the sun and rain. Do not wrap the sensor in plastic or seal it in a plastic bag.

      How can I get outdoor temperature / humidity to show on the display for the first time or after loss of information (i.e. power blackout)

      Here is the fast procedure which can apply to the majority of our most recent devices (techologie IT +).

      Bring both units (station + transmitter) inside your house and have the units 1 to 2 meters apart with nothing in-between them.

      1. Remove the batteries from both units, display and remote sensor.
      2. Wait until the display is blank to clear all memory (we recommend one minute).
      3. Put the batteries back into the transmitter.
      4. Taking care NOT to press any keys, reinstall the batteries into the base station.

      Be careful, batteries must be inserted as mentionned hereabove (transmitter first, then in the base station) to ensure a good functioning.

      1. Do not press any keys for at least 10 minutes after installing the batteries. (Let them establish a good connection. Pressing a button during this stage would be enough to stop the search for the sensor which is being now carried out by the station).

      Outdoor data should be showing on your display. You can now put your outdoor sensor back outside.

      Weather forecast icon

      Weather forecast icon indicates improvement or degradation trend rather than immediate sun or rain as the icon shows.

      Example: if current weather is cloudy and the icon of rain is displayed, this does not imply that the station is deficient because it is not raining. It simply means that the atmospheric pressure fell and that weather will be getting poor but not necessarily raining.

      Once your station installed, it is recommended to ignore the forecast for the next 24 to 48 hours, in order to leave time to the station and to operate in constant condition and altitude.

      Each noticeable and important change of atmospheric pressure will result in a change of icon. In the climates subjected to abrupt weather changes (e.g. sunny to rainy weather) the station will operate more precisely than in a climate with small weather variations (e.g. almost always sunny). In addition, an estimated forecast precision is about 75%.

      The La Crosse Technology weather stations are the only ones being equipped with a pressure sensor which records pressure variations every 3 hours and which calculates, on a 12 hours average, and displays weather tendency averages. Consequently, the La Crosse Technology weather stations are more sensitive and more precise than all other similar products.

      What's to be done if the data transmission of the outside sensor is random ?

      The random loss of the data sent from the transmitter can be due to local interferences. Move your device and take them away from metallic structures or / and electric devices, then reset entirely your device by following the procedure of implementation.

      What’s to be done if my watch’s display is defective ?

      Check the battery power and change it if necessary.



      This range is specific for French market and will only work in France.


      Mounting the thermo-hygro transmitter :

      In order to get an accurate reading and to prolong the life of your sensor, we recommend that you respect the following instructions:

      -          Always make sure that the rain protection cover is correctly placed on the sensor.

      -          Have it in a sheltered area out of the sun and direct rain. Fog and Mist will not affect the sensor, but a soaking in water may.

      You can mount it outside under an eve of your house or any other suitable place that will keep it out of the sun and rain. Do not wrap the sensor in plastic or seal it in a plastic bag.

      Mounting the rain sensor :

      In order to get an accurate reading and to prolong the life of your sensor we recommend that you :

      -          Always make sure that the rain sensor is mounted onto a horizontal surface : a faulty installation can lead you to get wrong recordings, or no recording at all

      -          Mount the sensor at a height of minimum 1 meter off the ground to prevent dirt from obstructing the funnel

      -          Mount it away from trees (the leaves could block the sensor )

      Check by tilting the rain sensor from side to side that the seesaw tray can move freely

      Mounting the wind sensor :

      In order to get an accurate reading and to prolong the life of your sensor we recommend that you :

      -          Always make sure that the wind sensor is perfectly horizontal : a faulty mounting can lead you to get wrong recordings, or no recording at all

      -          Avoid mounting the wind sensor near a TV antenna or a satellite dish

      -          Avoid mounting the wind sensor onto a metallic mast

      -          Make sure that the mounting allows the wind to travel around the sensor unhindered from all directions

      Compatibility with operating system :

      WS1501IT+                             => No PC connection

      WS1600IT+                            => No PC connection

      WS3650IT+                           => Windows XP (32 bits)

       WS2355IT+ / WS2357IT+    => Windows XP, Vista (32 bits)

      WS2800IT+ / WS2801IT+     => Windows XP, Vista, 7 (32 bits)

      What can I do or check if the weather station doesn’t connect with the computer ?

      -          Check the compatibility of the weather station with the operating system (cf here over);

      -          Be sure the PC cable is well connected ;

      -          Be sure that the COM port number selected in the program is the good one (check in ”Device manager”)

      -          Be sure the associated program are well installed

  • Assistance > Glossary

      The anemometer measures the wind speed and strength. The wind speed can be displayed in different measurement units: - Kilometre per hour (km/h) - Metre per second (m/s) - Knot per hour (Kt/h): Note: 1 knot per hour = 1,852 km per hour = 0,515 m per second - Beaufort (from 1 to 12; ie details in Beaufort)
      The barometer is the basic meteorological instrument. Its main function is to measure atmospheric pressure. Atmospheric pressure and especially its foreseeable evolutions are the determining factors for generating short- and medium-term weather forecasts. Even if atmospheric pressure remains the indispensable measure, other natural events must be observed and measured to generate high accurate trends.Barometer operating principle is based on a physical experiment: the pressure at a specified point of a fluid (like air, water, or mercury) reveals the intensity of the force exerted by the fluid on a specific surface, whatever the orientation of this surface in space is. If we decide to position this surface horizontal, the force, for a quiescent vacuum fluid, is nothing but the backbone weight of the fluid overcoming the surface. So, measuring the force exerted by the fluid means measuring this weight...that is to say the backbone weight of the fluid overcoming the horizontal reference surface. Of course, this applies to the pressure exerted by the air at each point of the atmosphere and/or of Earth Planet.In mercury barometers, a vertical glass tube extends the quiescent mercury volume in contact with free air. The air pressure on a horizontal level associated to the tube surface is the same everywhere, and this pressure is atmospheric pressure. Thus, the mercury column weight inside the tube at this level is the same as the air column weight that would overcome a surface with a section equals to the one of the tube, through the whole atmosphere. So, measuring atmospheric pressure means measuring this weight...that is to say the mercury column height from the surface level, since this height is independent of the tube section.The standard atmospheric pressure, fixed at 1 013,25 hPa, is equivalent to 760 mm of mercury height.Invented in 1643 by the Italian scientist Torricelli, mercury barometer figures among the oldest instruments used in meteorology. Mercury was used (before being considered as dangerous) for it was the heaviest liquid ever tested: therefore shorter glass tubes could be used.Later aneroid barometers were widely used, they were so called because its functioning was based on capsules movements amplification (unique or stacked up for more precision) after vacuum inside those capsules was made.
      This measurement unit was created by the British Admiral Francis Beaufort (1774-1857) and has been used since 1874, especially by the navy. It indicates in a simple way the wind power at a standard height of 10m above a flat and covered soil. The Beaufort unit has its equivalents in km/h and knot (kts). 0Calm> 1 km/h ( > 1 knot) 1Light air1-5 km/h (1 to 3 kts) 2Light breeze6-11 km/h (4 to 6 kts) 3Gentle breeze12-19 km/h (7 to 10 kts) 4Moderate breeze20-28 km/h (11 to 16 kts) 5Fresh breeze29-38 km/h (17 to 21 kts) 6Strong breeze39-49 km/h (22 to 27 kts) 7Near galeRough trees, difficult to walk against wind. The sea swells, foam getting the wind direction bearings forms50-61 km/h (28 to 33 kts) 8Fresh gale62-74 km/h (34 to 40 kts) 9Strong gale75-88 km/h (41 to 47 kts) 10Storm89-102 km/h (48 to 55 kts) 11Violent storm103-117 km/h (56 to 63 kts) 12Hurricane118 km/h and more (64 kts and more)
      The wind vane was invented by Leonardo da Vinci. It positions itself in the wind direction, then mechanically or electronically indicates it on a compass graduated North, North-West, West, etc. The wind direction also expresses itself in degrees on this same compass graduated from 0° to 360°. Then the North is 0° as well as 360°. The graduation turns clockwise, so that the East is at 90°, the South at 180° and the West at 270°.
      The "Physikalisch Technische Bundesanstalt" of Braunschweig in Germany operates an atomic caesium clock, which time deviation, according to calculations, is around +/- 1 second per 1 million years. The time appointed by this clock (Official Clock of Germany) is coded and transmitted from Mainflingen, near Frankfurt by long wave signal on the DCF-77 (77,5 kHz) frequency. This signal reception operates up to approximately 1.500 km around the transmitter. Devices able to receive and convert this signal, are settled automatically; hours, minutes, seconds, calendar (day, date, month, year) display without any human interference, since data are periodically checked. Note that Daylight Savings Time (DST) changes are made, of course, automatically.
      This index is calculated from the combination of the measured relative humidity level and the effective temperature: the humidex or comfort index allows evaluating the comfort of your environment.If the indoor temperature is between +20°C and +26°C and the relative humidity is between 45% and 65%, then the comfort level is satisfying. Outside these ranges, the comfort level becomes mediocre then bad and finally dreadful...the further off these ranges it moves.
      Searching for humidity value to evaluate the quantity of water in the air. So electronic devices try to determinate the relative humidity level. Talking about humidity means also talking about the humidity felt at a specific time, at a certain place, by one or several people. We will talk about a humid environment where the air is almost at saturation, even saturated, and about a dryness feeling where on the contrary the relative humidity level reveals an appreciable steam deficiency compared to what would be acceptable at the same place (and at the same temperature) before condensation starts.Thus, humidity is a quantifiable meteorological unit, but also a feeling, rationally subjective.
      The humidity measurement is hygrometry and its measurement unit is the percentage (%)…of the relative humidity of ambient air. This relative humidity gives, in percentage, the ratio between the quantity of steam effectively absorbed by the air and the maximum quantity that could be absorbed at the same temperature. However, it is advisable to distinguish: Absolute humidity (corresponding to the quantity of water (in weight) contained at a specific time in a certain volume of air) Relative humidity (percentage corresponding to the ratio between the existing water weight and the maximum water weight that could contains the air mass)
      The measurement unit of luminosity is lux (lx). The luxmeter is a device measuring the quantity of light received by a subject or reflected by a lighted surface. 1 lux is the illumination of a surface located at 1m of a light source with a 1 Candela intensity (1 lux = 1 lumen /m² = 10-4 phot).
      Meteorology is the science which aim is to study and experiment atmospheric phenomenon and its laws. This discipline is based on accurate scientific observations resting on physical laws. It belongs to our day life since weather forecast, the most famous branch of meteorology, has an influence on our behaviour in many ways. From the choice of what to wear to influences on human activities (agriculture, aeronautics, etc.), meteorological phenomenon are very important for the day life.Despite being able to modify them when they are detrimental, the human being has been trying to study and forecast them. The climate is defined by the same parameters as “ what is the weather like?”: the temperature measured with the thermometer, the air humidity level (hygrometry) measured with the hygrometer, the precipitations measured with the rainmeter, the wind force and speed measured with the anemometer, ect...
    • RAIN
      The measurement unit of pluviometry is the millimetre (of rainfall...liquid water). The device designated for measuring the precipitation height is the rainmeter. It is a receptacle with a specific surface collecting a certain quantity of water that felt during a specific period of time: a mathematic operation which is sometimes inaccurate allows graduating simple rainmeters, so called funnels. Electronic rainmeters use the reference units counting to upgrade the rainfalls. Rainmeters must always be placed in non-sheltered areas, away from trees, houses or walls.
      During the night, with a generally clear weather and no major disturbance, the soil becomes colder and transmits this cooling to the immediate air layers, which temperature is step by step dropping. If the very low layers night cooling goes on with a sufficient persistence, the saturating vapour pressure contained inside these layers will not stop dropping as the temperature decreases. The steam will start condensing and deposit dew on the soil: the achieved temperature level is called dew point.
      The measurement unit of atmospheric pressure is hectopascal (hPa) : 1hPa = 100 Pa (100 Pascal). Atmospheric pressure changes accordingly with the localisation and the temperature.The standard pressure is 1013,25 hPa at 0 m altitude. At 500 m altitude, 954,5 hPa and at 1000 m altitude 899 hPa, etc....The pressure changes from 1 hPa every 8 meters. That is to say moving a barometer from the ground floor of a building to the 10th floor can immediately modify a forecast. When the pressure increases the weather should get better, when the pressure decreases the weather should get worse. Improvement and degradation are always referred to the former situation...
      The temperature measurement units are firstly the degree Celsius (°C) then the degree Fahrenheit (°F). Thermometers allow measuring the temperature, but also temperature changes. The European measuring system is the Celsius system, where water freezes at 0° (freezing point) and boils at 100° (boiling point).Anglo-Saxon countries use the Fahrenheit scale, where the freezing point is at +32°F and the boiling point is at 212°F. The conversion factor between °C and °F is calculated as follow: °F = (1,8 x °C) + 32 OR °C = 0,56 x ( °F - 32) Thermometers with liquid (mercury, ethyl alcohol, etc.) use the dilatation of a liquid according to the temperature at constant the liquids are vacuum sealed. Thermometers so-called « bimetallic » use the difference of metal thermal expansion made by two different blades welded together. Finally, modern temperature sensing elements use the properties of some metals or electronic devices that have an electric resistance changing with the temperature.
      Windchill is the temperature such as we feel in certain conditions, especially in low temperature and strong wind. So windchill is a different temperature (generally lower) than the real measured temperature. Around the skin, a thin air layer warmer than ambient air is generated, because the body supplies a certain amount of heat. The wind sends away this warm air layer and then the skin is not protected anymore. Therefore the stronger is the wind, the colder we feel...And the temperature felt by Mister X will then be different than the one felt by Mister Y, depending on what clothes they are wearing.
      « Instant Transmission» is the up and coming state-of-the-art new wireless transmission technology,  exclusively developed by LA CROSSE TECHNOLOGY. “IT +” offers an immediate update of all the outdoor data measured from the transmitters : follow your climatic variations in real-time !With IT +, the informations displayed on your weather station are immediately updated every 4 to 8 seconds, instead of the traditional 5 minutes intervals.
  • Assistance > Contact us

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      La Crosse Technology
      6A, rue du commerce
      67118 Geispolsheim - FRANCE