DIGITAL ATOMIC WALL CLOCK
Indoor Temperature/Humidity
Outdoor Temperature
Moon Phase
Model KWS-8140U-IT | Instruction Manual
The digital atomic wall clock features radio-controlled time, date, alarm, indoor temperature and humidity, and moon
phase. Wireless outdoor temperature range (open air) up to 200 feet (60.96 meters).
Atomic Wall Clock
Outdoor Temperature Transmitter: TX40U-IT
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Setup Instructions Step-By-Step
Step 1:
• Slide the battery cover down and lift off the back of the transmitter.
• Insert 2 NEW AAA batteries (not included) into the TX40U-IT transmitter. Observe the correct polarity.
Step 2:
• Remove battery cover from atomic wall clock: insert a solid object in the space provided at the lower-central position of
the battery cover, then push up and pull out on the battery cover.
• Insert 2 NEW AA batteries (not included) into the back of the atomic wall clock. Observe the correct polarity (see
marking inside the battery compartment). The atomic wall clock will display time and indoor temperature.
• Within 3 minutes the outdoor temperature should be displayed.
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Keep the atomic wall clock and transmitter within 10 feet of each other during setup (15 minutes).
Do Not Mix Old and New Batteries
Do Not Mix Alkaline, Standard, Lithium or Rechargeable Batteries
915MHz Reception for Outdoor Transmitter
The atomic wall clock will receive the temperature data within 4 seconds. If the temperature data is not being received 2
minutes after set up (or the display shows “- - -”), then please check the following points:
1. The distance of the atomic wall clock or outdoor temperature transmitter should be at least 6 feet (2 meters) away
from any interfering sources such as computer monitors or TV sets.
2. Avoid placing the receiver onto or in the immediate proximity of metal window frames.
3. Using other electrical products such as headphones or speakers operating on the same signal frequency (915MHz)
may prevent correct signal transmission and reception.
4. Neighbors using electrical devices operating on the 915MHz signal frequency can also cause interference.
Note: When the 915 MHz signal is received correctly, do not re-open the battery cover of either the outdoor temperature
transmitter or atomic wall clock, as the batteries may spring free from the contacts and force a false reset. Should this
happen accidentally then reset all units (see SETUP above) otherwise transmission problems may occur.
The maximum transmission range is 220 feet (60 meters) from the outdoor temperature transmitter to the atomic wall
clock (in open space). However, this depends on the surrounding environment and interference levels. If no reception is
possible despite the observation of these factors, all system units have to be reset (see SETUP).
WWVB Radio-controlled Time Signal
The NIST radio station, WWVB, 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 atomic wall clock. However, due to the nature of the Earth’s Ionosphere, reception is very limited
during daylight hours. The atomic wall clock will search for a signal every night when reception is best.
Once the outdoor temperature is displayed on the atomic wall clock, the WWVB tower icon in the atomic wall clock will
flash the top of the LCD. This indicates that the atomic wall clock has detected a radio signal and is trying to receive it.
When the time code is received, the WWVB tower becomes permanently lit and the time will be displayed.
If the tower icon flashes, but does not set the time or the WWVB tower does not appear at all, then please take note of the
following:
• Recommended distance to any interfering sources like computer monitors or TV sets is a minimum of 6 feet (2 meters).
• Within ferro-concrete rooms (basements, superstructures), the received signal is naturally weakened. In extreme cases,
please place the unit close to a window and/or point its front or back towards the Fort Collins, Colorado..
• During nighttime, the atmospheric disturbances are usually less severe and reception is possible in most cases. A single
daily reception is adequate to keep the accuracy deviation below 1 second.
Note: In case the atomic wall clock is not able to detect the WWVB-signal (disturbances, transmitting distance, etc.), the
time can be manually set (please see Program Menu).
Function Buttons
The atomic wall clock has four easy to use buttons:
SET
+
ALM
SNZ
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SET
Hold to enter into the set mode for the following functions: time zone, DST ON/OFF (daylight saving time),
hour, minute, year, month, date, weekday, 12/24h time format display, ºF/ ºC temperature unit.
+
Hold to change any values in manual set mode
Press and release to toggle between the seconds, indoor, and outdoor display
ALM
SNZ
Hold to enter into the alarm set mode
Press and release to activate/deactivate the alarm
Press and release to activate the snooze function during alarm
Press and release to exit manual setting modes
Program Menu
Note: If the atomic wall clock has already successfully received the WWVB time signal and displays the correct time and
date, then the Manual settings can be skipped.
The SET button moves through the program menu. The + button changes a value. The following settings can now be
programmed:
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Time zone setting
DST ON/OFF
Manual time setting (Hour, Minute)
Year setting
Month setting
Date setting
Weekday setting
12/24h time format display
ºF/ºC temperature setting
Time Zone
The time zone can be set between the +/–12-hour range. Hold the SET button for 5 seconds.
1. The time zone -5 EST will flash. Use the + button to select the desired time zone.
Time zone settings: -12, -11, -10, ALA, PST, MST, CST, EST, ATL, EST, -4, -3, -2, -
1, 0, +1, +2...+12. (Default: EST)
2. Press and release the SET button to enter the DST Setting.
DST (daylight saving time)
1. The ON digit will flash on. Select DST ON or OFF by pressing the + button.
2. Press and release the SET button to manually set the time.
Note: The DST default is “ON”, meaning that the WWVB will automatically change the time according to
Daylight Saving Time in the spring and fall. For areas that do not recognize DST changes (Arizona and
Hawaii) turn the DST “OFF”.
Time Set
1. The hour digits will flash.
2. Press and release the + button to set the hour.
3. Press and release the SET button to move to the minutes.
4. The minute digits will flash.
5. Press and release the + button to set the minutes. If the + button is held, the units will
increase by 5.
6. Press and release the SET button to move to calendar set.
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Calendar Set
The year can be selected sequentially from 2001 to 2029 and will then start over again (default setting 2009). The year
will only appear in the manual set mode.
1. The year digits will flash(only last 2 digits).
2. Press and release the + button to set the year.
3. Press and release the SET button to move to the month.
4. The month digits will flash.
5. Press and release the + button to set the month.
6. Press and release the SET button to move to the numeric date.
7. The date digits will flash.
8. Press and release the + button to set the date.
Note: The date can only be set in conjunction with the selected month. For example, it is not possible to set the date 30 if
the month of February is selected.
9. Press and release the SET button to move to the weekday.
10. The weekday symbols will flash.
11. Press and release the + button to set the weekday.
12. Press and release the SET button to move to 12/24 hour time.
12/24h Time Format
The time format can be display in 12 or 24 (Default setting 12).
1. The digits 12 or 24 will flash.
2. Press and release the + button to select 12 hour or 24 hour time format.
3. Press and release the SET button to move to select ºF or ºC Temperature .
°F or °C Temperature
The temperature setting can be set to either to ºF or ºC (Default setting °F).
1. The characters °F or °C will flash.
2. Use the + button to select °F for temperature display in degrees Celsius or °C for degrees Fahrenheit.
3. Press and release the SET button to exit the setting mode and switch back to the normal time display.
Exit Manual Set Mode
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Press the SNZ button to return to the normal time display mode anywhere in manual setting mode.
If no buttons are pressed for at least 15 seconds in setting mode, the atomic wall clock will automatically switch back
to normal display mode.
Display Modes (seconds counting)
This clock offers a feature of having seconds count on in place of the temperatures or weekday. This offers a variety of
display options for your clock.
The default time display will show the lower display as:
indoor humidity/ indoor temperature/ Month& date/ Weekday/ outdoor temperature.
(no seconds)
1. Press the + button. The display should now show:
indoor humidity/ seconds/ Month& date/ Weekday/ outdoor temperature.
(Seconds replace indoor temperature).
2. Press the + button a second time and the display will now show:
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indoor humidity/ indoor temperature/ month & date/ weekday/ seconds.
(Seconds replace outdoor temperature).
3. Press the + button a third time and the display will now show:
indoor humidity/ indoor temperature/ month & date/ seconds/ outdoor temperature
(Seconds replace weekday).
4. Press the + button a fourth time and the display will return to the default time display.
Alarm Set
To enter into the alarm setting mode:
1. Hold the ALM button for 4 seconds. The hour digits start flashing.
2. Press and release the + button to set the hour.
3. Press and release the ALM button to set the minutes. The minute digits start flashing.
4. Press and release the + button to set the minutes.
5. Press and release again the ALM button to exit the Alarm setting mode or wait for 15 seconds automatic timeout.
Deactivate Alarm
The alarm will be automatically ON when the alarm time is set. The alarm icon
is visible after the minutes. To
deactivate the alarm (OFF), press and release once the ALM button in normal mode display. The alarm icon will
disappear, the alarm is now off.
Snooze
When the alarm sounds press the SNZ button on the back of the clock to activate the snooze feature for 10 minutes..
Moon Phase
The Moon Phase will show according to the calendar setting. There are total twelve Moon Phases that will display on
LCD.
Note: With the moon shown against a light colored background, the phases will show opposite to a paper calendar. The
segments that are highlighted portray the part of the moon that is lit. For instance, the moon will be blank during a new
moon and dark during a full moon.
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Waxing means growing or expanding illumination which occurs after a new moon.
Waning means decreasing illumination and occurs after a full moon.
Crescent refers to the moon being less than half illuminated. Crescents can be waning or waxing.
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Gibbous describes a moon phase when more than half is illuminated. Gibbous can be waxing or waning.
New Moon occurs when the moon is between the earth and sun, so the illuminated portion of the moon is on the back
side facing the sun and we cannot see it. After a new moon, the illuminated (visible) portion will increase or wax until
the full moon occurs.
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Full Moon occurs when the earth, moon and sun are in approximate alignment with the moon and the sun on
opposite sides of the earth. The illuminated portion of the moon faces the earth, giving us complete visibility of one
side of the entire moon. After a full moon, the illuminated portion will decrease or wane until the new moon occurs.
First Quarter and Last Quarter moons occur when the moon is at a 90 degree angle to the earth and sun. We see
half of the moon illuminated and half is in shadow.
Low Battery Icon
When the
When the
symbol appears behind the time, replace the batteries in the atomic wall clock.
symbol appears near the outdoor temperature, replace batteries in the outdoor transmitter.
Please help in the preservation of the environment and return used batteries to an authorized depot.
Install Batteries in the Outdoor Transmitter
The Outdoor Transmitter uses 2 x AAA, IEC, LR3, 1.5V batteries. To install and replace the batteries, please follow the
steps below:
1. Slide the battery cover down and lift off the back of the transmitter.
2. Insert 2 NEW AAA batteries (not included) into the TX40U-IT transmitter. Observe the correct polarity.
Note: When changing batteries in any unit, all units need to be reset by following the setup procedures.
This is due to a random security code assigned by the transmitter at start-up. This code must be received
and stored by the atomic wall clock in the first 3 minutes of power being supplied to the transmitter. If the
atomic wall clock has been operating for more than 5 hours, remove batteries from the outdoor transmitter and the atomic
wall clock for at least 15 minutes before completing a restart.
Install Batteries in the Atomic wall clock
The atomic wall clock uses 2 x AA, IEC LR6 1.5V batteries. To install and replace the batteries, please follow the steps
below:
1. Remove battery cover from atomic wall clock: insert a solid object in the space
provided at the lower-central position of the battery cover, then push up and pull out
on the battery cover.
2. Insert 2 NEW AA batteries (not included) into the back of the atomic wall clock.
Observe the correct polarity (see marking inside the battery compartment). The
atomic wall clock will display time and indoor temperature.
3. Within 3 minutes the outdoor temperature should be displayed.
4. Keep the atomic wall clock and transmitter within 10 feet of each other during setup
(15 minutes).
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Do Not Mix Old and New Batteries
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Do Not Mix Alkaline, Standard, Lithium or Rechargeable Batteries
Note: If the atomic wall clock does not display indoor temperature after 60 seconds, remove batteries and
wait for at least 60 seconds before repeating the setup process.
Position the Atomic wall clock
The atomic wall clock provides the option of table standing or wall mounting. Before mounting, please check that
the outdoor data can be received from the desired locations.
Foldout stands: Simply unfold the legs on the back and place the atomic wall clock on a desk or table.
Wall mounted:
1.Fix a screw (not supplied) into the desired wall, leaving the head extended out by about 0.2” (5mm).
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2.Place the atomic wall clock onto the screw, using the hanging hole on the backside. Gently pull the atomic wall clock
down to lock the screw into place.
3.Choose a location 6 feet or more from electronics such as cordless phones, gaming systems, televisions,
microwaves, routers, etc.
4.Place within range of the outdoor transmitter.
5.The maximum transmitting range in open air is 200 feet (96 meters). Obstacles such as walls, windows,
stucco, concrete, and large metal objects can reduce the range.
6.For best WWVB reception, orientate the atomic wall clock with the front or the back facing Ft. Collins,
Colorado and mount on an exterior wall.
Position the Outdoor Transmitter
To achieve a true temperature reading, mount in a shaded location. While the outdoor temperature sensor is weather
resistant, avoid submersion in water or snow. We recommend that you mount the outdoor temperature sensor on an
outside North-facing wall. The transmission range is 200ft(open air). Obstacles such as walls, concrete, and large metal
objects can reduce the range. Place both units in desired location, and wait approximately 15 minutes before
permanently mounting to ensure that there is proper reception.
Wall Mount:
1.Remove the mounting bracket from the outdoor temperature sensor .
2.Place the mounting bracket in the desired shaded location (wall or table).
3.Through the screw holes of the bracket, mark the mounting surface with a pencil.
4.Screw mounting bracket onto the mounting surface. Ensure that the screws are flush with the
bracket. Do not over-tighten.
5.Insert the outdoor temperature sensor into the bracket.
Note: Mounting with adhesive tape is not recommended as a permanent mounting solution. Only use adhesive tape
during set-up process.
Care and Maintenance
• Do Not Mix Old and New Batteries
• Do Not Mix Alkaline, Standard, Lithium or Rechargeable Batteries
• Do not expose the atomic wall clock to extreme temperatures, vibration or shock.
• Keep atomic wall clock dry.
• Clean atomic wall clock with a soft damp cloth. Do not use solvents or scouring agents.
• The product is not a toy. Keep it out of reach of children.
• The product is not to be used for medical purpose or for public information, but is determined for home use only.
• The specifications of this product may change without prior notice.
• Improper use or unauthorized opening of housing will void the warranty.
• If the unit does not work properly, change the batteries.
Specifications
Temperature measuring range
Indoor:
14.5°F to 138°F with 0.5°F resolution (-9.5°C to +59.9°C with 0.5°C resolution)
(“OF” displayed if outside this range)
Outdoor:
-39.8°F to 139.8°F with 0.2°F resolution (-39.9°C to 59.9°C with 0.1°C resolution)
(“OFL” displayed if outside this range)
Indoor humidity:
20% to 95% with 1% resolution
(“- -“ is displayed if outside the range)
(“19%” is displayed below 20%; "96%“will be displayed above 95%)
Temperature and humidity checking interval:
Indoor:
Every 8 or 16 seconds
Outdoor:
Humidity:
Every 4 seconds
Every 65 seconds
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Transmission distance:
Maximum:
200 feet (60 meters) in open air
Power consumption (Alkaline batteries recommended)
Atomic wall clock:
TX40U-IT Temp Sensor:
2 x AA, 1.5V batteries
2 x AAA, 1.5V batteries
Battery life:
Atomic wall clock:
TX40U-IT Temp Sensor:
approximately 24 months
approximately 12 months
Dimensions (L x W x H)
Atomic wall clock:
TX40U-IT Temp Sensor:
9.17“ x 1.16“ x 8.30“ (233 x 29.4 x 210.8 mm)
1.27" x 0.55" x 3.40" (32.4mm x 14.1 x 86.5mm)
Warranty Information
La Crosse Technology, Ltd provides a 1-year limited warranty on this product against manufacturing defects in materials
and workmanship.
This limited warranty begins on the original date of purchase, is valid only on products purchased and used in North
America and only to the original purchaser of this product. To receive warranty service, the purchaser must contact La
Crosse Technology, Ltd for problem determination and service procedures. Warranty service can only be performed by a
La Crosse Technology, Ltd authorized service center. The original dated bill of sale must be presented upon request as
proof of purchase to La Crosse Technology, Ltd or La Crosse Technology, Ltd’s authorized service center.
La Crosse Technology, Ltd will repair or replace this product, at our option and at no charge as stipulated herein, with new
or reconditioned parts or products if found to be defective during the limited warranty period specified above. All replaced
parts and products become the property of La Crosse Technology, Ltd and must be returned to La Crosse Technology,
Ltd. Replacement parts and products assume the remaining original warranty, or ninety (90) days, whichever is longer.
La Crosse Technology, Ltd will pay all expenses for labor and materials for all repairs covered by this warranty. If
necessary repairs are not covered by this warranty, or if a product is examined which is not in need or repair, you will be
charged for the repairs or examination. The owner must pay any shipping charges incurred in getting the La Crosse
Technology, Ltd product to a La Crosse Technology, Ltd authorized service center. La Crosse Technology, Ltd will pay
ground return shipping charges to the owner of the product to a USA address only.
The La Crosse Technology, Ltd warranty covers all defects in material and workmanship with the following specified
exceptions: (1) damage caused by accident, unreasonable use or neglect (including the lack of reasonable and necessary
maintenance); (2) damage occurring during shipment (claims must be presented to the carrier); (3) damage to, or
deterioration of, any accessory or decorative surface; (4) damage resulting from failure to follow instructions contained in
the owner’s manual; (5) damage resulting from the performance of repairs or alterations by someone other than an
authorized La Crosse Technology, Ltd authorized service center; (6) units used for other than home use (7) applications
and uses that this product was not intended or (8) the products inability to receive a signal due to any source of
interference.. This warranty covers only actual defects within the product itself, and does not cover the cost of installation
or removal from a fixed installation, normal set-up or adjustments, claims based on misrepresentation by the seller or
performance variations resulting from installation-related circumstances.
LA CROSSE TECHNOLOGY, LTD WILL NOT ASSUME LIABILITY FOR INCIDENTAL, CONSEQUENTIAL, PUNITIVE,
OR OTHER SIMILAR DAMAGES ASSOCIATED WITH THE OPERATION OR MALFUNCTION OF THIS PRODUCT.
THIS PRODUCT IS NOT TO BE USED FOR MEDICAL PURPOSES OR FOR PUBLIC INFORMATION. THIS PRODUCT
IS NOT A TOY. KEEP OUT OF CHILDREN’S REACH.
This warranty gives you specific legal rights. You may also have other rights specific to the State. Some States do not
allow the exclusion of consequential or incidental damages therefore the above exclusion of limitation may not apply to
you.
For warranty work, technical support, or information contact:
La Crosse Technology, Ltd
2817 Losey Blvd. S.
La Crosse, WI 54601
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Contact Support: 1-608-782-1610
Product Registration:
Online at:
Protected under U.S. Patents:
5,978,738
6,076,044
6,597,990
FCC Disclaimer
RF Exposure mobile:
The internal / external antennas used for this mobile transmitter must provide a separation distance of at least 20 cm (8 inches)
from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter."
Statement according to FCC part 15.19:
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not
cause harmful interference, and (2) this device must accept any interference received, including interference that may cause
undesired operation.
Statement according to FCC part 15.21:
Modifications not expressly approved by this company could void the user's authority to operate the equipment.
Statement according to FCC part 15.105:
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
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Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help
All rights reserved. This handbook must not be reproduced in any form, even in excerpts, or duplicated or processed using
electronic, mechanical or chemical procedures without written permission of the publisher.
This handbook may contain mistakes and printing errors. The information in this handbook is regularly checked and corrections
made in the next issue. We accept no liability for technical mistakes or printing errors, or their consequences.
All trademarks and patents are acknowledged.
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