La Crosse Technology WS-9740U-IT User manual

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Contents
Language Page
___________________________________________________________________
English 1
French 47
Spanish 96

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TABLE OF CONTENTS
Topic Page
Inventory of Contents 3
Features 4
Setting Up 6
Battery Installation 8
Function keys 10
LC Screen and Settings 12
Atomic time -WWVB Radio Controlled Time 14
Manual Settings 15
Weather Man Icon 20
isplay of Indoor Temperature and Humidity Reading 21
isplay of Outdoor Temperature Reading 22
isplay of Outdoor Minimum and Maximum records 23
isplay of Indoor Minimum and Maximum records 24
Ice Alarm 26
915 MHz Reception 27
Mounting 28
Care and Maintenance 31
Specifications 32

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Warranty Information 33
FAQ
INVENTORY OF CONTENTS
1. Wireless Weather Station
2. Wireless Temperature Sensor (TX37U) and mounting bracket.
3. Instruction Manual
This product o ers: INSTANT TRANSMISSION
is the state
-
o
-
the
-
art
new wireless transmission technology,
exclusively designed and developed by LA
CROSSE TECHNOLOGY. INSTANT
TRANSMISSION
o ers you an immediate update
(every 4 seconds!) o all your outdoor data
measured rom the transmitters: ollow your
climatic variations in real-time!

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FEATURES:
The Weather Station
Foldout
Stand
Battery
compartment
cover
Function
Keys
LC
isplay
Hanging hole
Ice Alarm Key

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• Atomic time function (WWVB Radio controlled time) with manual setting options
• aylight Saving Time ON/OFF
• Hour and minute display
• Calendar display
• Time zone option 0 to 12 hours
• Wireless transmission at 915 MHz
• Outdoor signal reception intervals at 4-second
• isplay one of the multiple easy-to-read Temperature condition icons featured by
Weather Girl
• Temperature display in Fahrenheit (°F) or Celsius (°C) selectable
• Indoor and Outdoor temperature display with MIN/MAX recording
• All MIN/MAX recordings can be reset
• Low battery indicator
• Wall hanging or free standing

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The Outdoor Temperature Sensor
• Remote transmission of outdoor temperature to Weather
Station by 915 MHz
• Weather-resistant casing
• Wall mounting case
• Mount in a sheltered place. Avoid direct rain and sunshine
SETTING UP:
1. First, insert the batteries into the temperature sensor. (see “Install and replace
batteries in the temperature sensor“).
2. Immediately after and within 2 minutes, insert the batteries into Weather Station (see
“Install and replace batteries in the Weather Station”). Once the batteries are in
place, all segments of the LC will light up briefly. Following the time as 12:00 and
the "Oscar Outlook" icon will be displayed. If these are not displayed after 60

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seconds, remove the batteries and wait for at least 10 seconds before reinserting
them.
3. After inserting the batteries into the sensor, the Weather Station will start receiving
data from the sensor. The outdoor temperature and the signal reception icon should
then be displayed on the Weather Station. If this does not happen after 5 minutes, the
batteries will need to be removed from both units and reset from step 1.
4. In order to ensure sufficient 915 MHz transmission there should be no more than 330
feet (100 meters) between the final position of the Weather Station and the sensor
(see notes on “Mounting” and “915 MHz Reception”).
Note:
• The Weather Station will receive one outdoor sensor only.
• If the signal reception is not successful on the first frequency (915MHz) for 22
seconds, the frequency is changed to 920MHz and the reception is tried another 22
seconds. If still not successful the reception is tried for 22 seconds on 910MHz. This
will also be done for re-synchronization.
• If after 10 minutes, the Atomic time (WWVB time) signal has not been received, press
the SET key to manually enter a time initially.
• aily WWVB reception is attempted at full hour between 12:00 am to 6:00 am. If the
reception is successful, there will no reception attempt until the following day. When
this is successful, the received time will override the manually set time. The date is

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also updated with the received time. (Please refer also to notes on “Atomic auto-set
time - WWVB Radio controlled Time” and “Manual Time Setting”).
BATTERY INSTALLATION
INSTALL AND REPLACE BATTERIES IN THE WEATHER STATION
The Weather Station uses 2 x AAA, IEC LR3, 1.5V Alkaline batteries. To install and replace
the batteries, please follow the steps below:
1. Remove the cover at the back of the Weather
Station.
2. Insert batteries observing the correct polarity (see
marking).
3. Replace compartment cover.

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INSTALL AND REPLACE BATTERIES IN THE TEMPERATURE SENSOR
The temperature sensor uses 2 x AA, IEC LR6, 1.5V Alkaline battery.
To install and replace the batteries, please follow the steps below:
1. Pull out the battery holder at the bottom of the sensor.
2. Insert the batteries, observing the correct polarity (see marking).
3. Replace the battery holder on the unit.
Note:
In the event of changing batteries in any of the units, all units need to be reset by following
the setting up procedures. This is because a random security code is assigned by the
sensor at start-up and this code must be received and stored by the Weather Station in the
first 3 minutes of power being supplied to it
BATTERY CHANGE:
It is recommended to replace the batteries in all units regularly to ensure optimum accuracy
of these units (Battery life see Speci ications below).

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Please participate in the preservation o the environment. Return used
batteries to an authorized depot.
FUNCTION KEYS:
Weather Station:
The Weather Station has four easy to use function keys.
SET key (Manual Setting):
• Press to enter the set mode for the following functions: Time zone, aylight saving
SET key
MIN/
MAX key
+ key
Ice Alarm key

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time ON/OFF, Manual time, Year, Month, ate, Weekday and °C/°F settings.
MIN/ MAX key
• To toggle between the maximum/ minimum outdoor temperature and maximum/
minimum indoor temperature data
• Press to reset the maximum or minimum temperature records of the indoor and the
outdoor channel (will reset all records to current level)
• Press to exit the setting mode
+ key
• Make adjustments for various settings
• In normal display, press to toggle between the display of the calendar and second of
time in the time display of LC
Ice Alarm key
• To activate / deactivate the Ice Alarm (alarm will be triggered once the outdoor
temperature has dropped to 39.2°F)
• To exit from the manual setting mode

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LCD SCREEN AND SETTINGS:
Indoor Temperature
isplay "Calendar"
or "Second"
Time display
Weather Girl icon
(Based on
temperature)
Receiver low
battery icon
Outdoor Temperature
Ice alarm icon
Time reception icon
Indoor humidity %RH
Outdoor signal
reception icon*
Transmitter low battery icon

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* When the outdoor signal is successfully received by the Weather Station, this icon will be
switched on. (If not successful, the icon will not be shown in LC ) User can easily see
whether the last reception was successful (icon on) or not (icon off). On the other hand, the
short blinking of the icon shows that a reception is currently taking place.
For easy viewing, the LC screen is divided into 3 sections displaying the information for
time and indoor data, weather forecast, and outdoor data.
Section 1 - OUTDOOR TEMPERATURE
• isplay the current outdoor temperature.
• By pressing the MIN/ MAX key, display the stored MIN/MAX outdoor temperature,
with simultaneous display of MIN/ MAX icon.
• A signal reception symbol will be shown indicating that outdoor temperature signal is
received.
Section 2 - INDOOR DATA AND WEATHER ICON (FEATURED BY WEATHER GIRL)
• isplay indoor temperature and indoor humidity
• The current temperature condition is displayed in form of one of multiple icons,
featured by Weather Girl, which change in appearance according to the current
outdoor temperature.
• Format of the Oscar Outlook icons refers to the below clause "Weather Girl"

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Section 3 - TIME AND CALENDAR
• In normal mode, display the time and calendar.
• A signal reception symbol is shown indicating that Atomic time (WWVB time) signal is
received.
ATOMIC TIME - WWVB RADIO CONTROLLED TIME
The NIST (National Institute of Standards and Technology—Time and Frequency ivision)
WWVB radio station is located in Ft. Collins, Colorado, and transmits the exact time signal
continuously throughout the United States at 60 kHz. The signal can be received up to
2,000 miles away through the internal antenna in the Weather Station. However, due to the
nature of the Earth’s Ionosphere, reception is very limited during daylight hours. The
wireless weather station will search for a signal every night when reception is best.
The WWVB radio station receives the time data from the NIST Atomic clock in Boulder,
Colorado. A team of atomic physicists is continually measuring every second, of every day,
to an accuracy of ten billionths of a second per day. These physicists have created an
international standard, measuring a second as 9,192,631,770 vibrations of a Cesium-133
atom in a vacuum. For more detail, visit http://www.boulder.nist.gov/timefreq.htm. To listen
to the NIST time, call [phone]. This number will connect you to an automated time,
announced at the top of the minute in “Coordinated Universal Time”, which is also known
as Greenwich Mean Time (GMT). This time does not follow aylight Saving Time changes.

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After the top of the minute, a tone will sound for every second. It is possible that your
wireless weather station will not be exactly on the second due to the variance in the quartz.
However, the clock will adjust the quartz timing over the course of several days to be very
accurate; under 0.10 seconds per day.
MANUAL SETTINGS:
The following manual settings can be done in the setting mode:
• Time zone setting
• aylight Saving Time ON/OFF setting
• Manual time setting
• Calendar setting
• °F/ °C setting
Press and hold the SET key for about 3 seconds to advance to the setting mode:
TIME ZONE SETTING:
flashing

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The time zone default of the Weather station is -5 hr. To change to another time zone:
1. Press and hold the SET key for about 3 seconds to enter the time zone setting
(flashing).
2. Using the + key, set the time zone. The range runs between 0 to -12 hr, in
consecutive 1 hour intervals.
3. Press the SET key to confirm and enter the “Daylight Saving time ON/OFF setting”
or exit the setting mode by pressing the MIN/MAX key
DAYLIGHT SAVING TIME ON/OFF SETTING
1. The digit “ON ST” will start flashing on the LC .
2. Use the + key to turn ON or OFF the daylight saving time function.
3. Confirm with the SET key and enter the “Manual Time setting” or exit the setting
mode by pressing the MIN/MAX key.
flashing

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MANUAL TIME SETTING
In case the Weather Station is not able to detect the Atomic time (WWVB) signal
(disturbances, transmitting distance, etc.), the time can be manually set. The clock will then
work as a normal Quartz clock.
To set the clock:
1. The hour digits start flashing in the time display section.
2. Use the + key to adjust the hours and then press SET key to go to the minute setting.
3. The minute will be flashing. Press the + key to adjust the minutes.
4. Confirm with the SET key and enter the “Calendar Setting” or exit the setting mode
by pressing the MIN/MAX key
Note:
• The unit will still try to receive the signal at each full hour despite it being manually
set. When it does receive the signal, it will change the manually set time into the
received time.
Minutes (flashing)
Hours (flashing)

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Weekday
•
The time format is fixed to "12-hr" time display. "PM" will be shown in hours from
noon to midnight.
CALENDAR SETTING
The date default of the Weather Station is 1. 1. of the year 2006 after initial set-up. Once
the radio-controlled time signals are received, the date is automatically updated. However,
if the signals are not received, the date can also be set manually. To do this:
1. Using the + key, set the year required. The range runs from 2000 to 2029 (default is
2006).
2. Press the SET key to enter the month setting mode.
Year
"Month. ate."

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3. The month digit will be flashing. Press the + key to set the month and then press the
SET key to go to the date setting.
4. The date digit will be flashing. Press the + key to set the date.
5. Confirm with the SET key and set the weekday.
6. Press + key to select the weekday, "MO", TU", "WE" etc.
7. Confirm with SET key and enter the “°F/°C TEMPERATURE UNIT SETTING” or exit
the setting mode by pressing the MIN/MAX key.
°F/°C TEMPERATURE UNIT SETTING
The default temperature reading is set to °F (Fahrenheit). To select °C (Celsius):
1. The “°F/ °C” will be flashing, use the + key to toggle between “°F” and “°C”.
2. Once the desired temperature unit has been chosen, confirm with the SET to exit the
setting mode.
flashing

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WEATHER GIRL ICON:
One of the multiple temperature icons (featured by Weather Girl with different clothing) is
displayed in the center of LC , which indicates the different temperature conditions due to
the current outdoor temperature (temperature value detected by the outdoor sensor):
>78.8°F 69.8 - 78.7 °F 59 - 69.7°F 50 - 58.9°F
(>26°C) (21.0 - 25.9°C) (15.0 - 20.9°C) (10.0 - 14.9°C)