DIGITAL ATOMIC WALL CLOCK
Indoor Tempe rature/Humidity
Outdoor Tem pe r atu r e
Moon Pha se
Model KWS-8140U-IT | Instruction Manual
The digital atomic wall clock features radio-cont r olled time, date, alarm, indoor temperature and humidity, and m oon
phase. Wirel ess outdoor t em per ature range (open air) up to 200 feet (60.96 meters).
Atomic Wall Clock
Outdoor Temperature Transmitter: TX40U-IT
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Table of Contents
TX40U-IT
(32.4mm x 14.1 x 86.5mm)
Atomic Wall Clock 1
Outdoor Temper ature Transmitter: TX40U-IT 1
Features 2
Setup Instructi ons St ep-By-Step 3
915MHz Reception Outdoor Transmitter 3
WWVB Radio-controlled Time Signal 3
Function Buttons 3
Program Menu 4
Time Zone 4
Daylight Saving Time 4
Time Set 4
Calendar Set 5
12/24 Hour Format 5
Fahrenheit /Celsius 5
Exit Program Menu 5
Display Modes 5
Alarm Set 6
Deactivate Alarm 6
Snooze 6
Moon Phase 6
Low Battery 7
Install or Repl ac e Batteries in the Outdoor Transmitter 7
Install or Repl ac e Batteries in the Atomic Wall Clock 7
Position the Atomic Wall Clock 7
Position the Outdoor Transmitter 8
Care and Maintenance 8
Specifications 8
Warranty Information 9
FCC Statement 10
KWS-8140U-IT
2-AA Alkaline batteries
9.17“ x 1.16“ x 8. 30“
(233 x 29.4 x 210.8 mm)
2-AAA Alkaline batteries
1.27" x 0.55" x 3.40"
Features
• Wireless outdoor temperature (°F or °C)
• Monitors indoor temperatur e (°F or ° C)
• Monitors indoor humidity
• 12 moon phases
• Atomic time and date with manual setting
• Automatically updates f or Daylight Saving Time (on/off option)
• 12/24 hour time display
• Perpetual calendar
• Time zone setting
• Time alarm with snooze
• Time display: hours, minutes, seconds
• Wall hanging or free standing
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Setup Instructions Step-By-Step
Step 1:
• Sli de the battery cover down and lift off the back of the transmitter.
• Insert 2 NEW AAA batteries (not included) i nto 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, t hen push up and pul l out on the battery cover.
• Insert 2 NEW AA batteries (not included) into the back of the atomic wall clock. Observe the corr ect polar ity (see
marking inside the battery compartment). The atomic wall clock will display time and indoor t em per ature.
• Within 3 minutes the outdoor temper ature should be displayed.
• 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 Rechargeabl e Bat t eries
915MHz Reception for Outdoor Transmitter
The atomic wall clock will receive the temperature data withi n 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 t he atomic wall clock or outdoor temperatur e 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 rec eiv er onto or in the immediate proximity of met al window frames.
3. Using other el ec trical products such as headphones or speaker s operat ing on the same signal fr equenc y ( 915MHz)
may prevent corr ect si gnal transmission and recepti on.
4. Neighbors using el ec trical 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
transmitt er or atomic wall clock, as the batteries may spring free from the contacts and force a fal se reset. S hould this
happen accidentally then reset all units (see SETUP abov e) otherwise tr ansmission problems m ay 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 environm ent and interference levels. If no reception is
possible despite the observation of these fact or s, 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 tim e signal c ontinuously
throughout the Unit ed S tates at 60 kHz. The signal can be received up to 2,000 miles away through the internal
antenna in the atomic wall cl oc k . However, due to the nature of the Ear th’s Ionosphere, reception is very limit ed
during daylight hours. The atom ic wall clo ck will search for a signal every night when recepti on is best.
Once the outdoor temper ature is displayed on the atomic wall cloc k, the WWVB tower icon in the at omi c wall clock will
flash the top of the LCD. This indicat es that t he atomic wall clo c k has detected a radio signal and i s trying to receive it.
When the time code is receiv ed, t he WW VB tower becom es permanently lit and the time will be displayed.
If the tower icon fl ashes, but does not set the time or the WWVB tower does not appear at all, then please take note of the
following:
• Rec om mended distance to any interfering sources like computer monitor s or TV sets is a minimum of 6 feet (2 meters).
• Within ferro-concrete rooms (basements, superstructur es), the received signal is naturally weakened. In extrem e cases,
please place the unit cl ose to a window and/or point its front or back towards the Fort Collins, Colorado..
• Dur ing 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 devi ation below 1 second.
Note: In case the atomic wall cl oc k i s not able to detect the WWVB-signal (disturbances, t r ansmitting 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 f or the following functions: time zone, DST ON/OFF (daylight saving time),
hour, minute, y ear, m onth, date, weekday, 12/24h time format displ ay , ºF / ºC t em per ature unit.
+ Hold to change any values in manual set mode
Press and release to toggle between the seconds, indoor, and outdoor display
ALM Hold to enter into the alarm set mode
Press and release to ac tivate/deactiv ate the alarm
SNZ Press and release to ac tivate the snooze functi on duri ng alarm
Press and release to exit manual setting modes
Program Menu
Note: If the atomic wall clock has al r eady successf ully received the WWVB time signal and displays the correct time and
date, then the Manual setti ngs can be ski pped.
The SET button moves through the program menu. The + button changes a value. The following settings can now be
programmed:
• T ime 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 setti ng
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 wil l 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 S E T button to enter the DST Setting.
DST (daylight saving time)
1. The ON digit will f la sh 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 automaticall y change t he time according to
Daylight Saving Time in the spring and fall. For areas that do not recogniz e DS T changes (Ari z ona and
Hawaii) turn the DST “OFF”.
Time Set
1. The hour digits w ill flas h .
2. Press and release t he + button to set the hour.
3. Press and release the SET button to move to the minutes.
4. The minute digits w ill flas h .
5. Press and release t he + button to set the minutes. If the + button is held, the unit s wil l
increase by 5.
6. Press and release the S E T button to move to calendar set.
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Calendar Set
The year can be selected sequenti ally from 2001 to 2029 and will then start over again (default setti ng 2009) . The year
will only appear in the manual set mode.
1. The year digits will f la sh(only last 2 digits).
2. Press and release t he + 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 t he + 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 t he + button to set the date.
Note: The date can only be set in conj unction with the selected month. For ex am ple, it is not possible to set the date 30 if
the month of February i s selected.
9. Press and release the SET button to move to the weekday.
10. The weekday symbols will flash.
11. P r ess and release the + button to set the weekday.
12. P r ess and release the SET button to move to 12/24 hour time.
12/24h Time Form at
The time format can be display in 12 or 24 ( Default setting 12).
1. The di gits 12 or 24 will flash.
2. Press and release t he + 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 temperatur e setting can be set to either to ºF or ºC (Default setting °F).
1. The charac ters °F or °C will flash.
2. Use the + button to select °F for temperature display in degrees Celsius or °C for degrees Fahrenhei t.
3. Press and release the S E T button to exit the setting mode and switch back to t he normal time display.
Exit Manual Set Mode
• 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 setti ng m ode, the atomic wall clock will automati c ally switch back
to normal display mode.
Display Modes (second s count in g)
This clock offers a feature of having seconds count on in place of the temperat ur es or weekday. This offers a variety of
display options for your clock.
The default time display will show the lower displ ay 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 t em per ature).
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 w eek day ) .
4. Press the + button a fourth time and the display will return t o the default time display.
Alarm Set
To enter into the alarm setting mode:
1. Hold t he 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 agai n the ALM button to exit the Alarm setting mode or wait for 15 seconds automatic timeout.
Deactivate Alarm
The alarm will be automati c ally ON when the alarm time is set. The alarm icon is visible after the minutes. To
deactivat e the alarm (OFF ), pr ess and release once the ALM button i n 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 Phas e
The Moon Phase will show accordi ng 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 phase s will show opposite to a paper calendar . The
segments that are highlighted portray the part of the moon that is li t. For instanc e, the moon will be blank during a new
moon and dark during a full moon.
• 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 wax ing.
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• Gibbous describes a moon phase when more than half is illuminat ed. Gibbous can be waxing or waning.
• New Moon occurs when the moon is between the earth and sun, so the i lluminated portion of the m oon is on the back
side facing the sun and we cannot see it. After a new moon, the illuminated (v isible) portion will increase or wax until
the full moon occurs.
• Full M o on occurs when the earth, moon and sun are i n approximate alignment with the moon and the sun on
opposite sides of t he ear th. The illuminated portion of the m oon faces the ear th, giving us complete vi sibili ty 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 symbol appears behind the time, replace the batteries i n the atomic wall clock.
When the symbol appears near the outdoor temperature, replace batteries in the outdoor t r ansmit ter.
Please help in the preservati on of the envir onm ent and return used batte r ie s t o a n a uthorized de pot.
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 c ode assigned by the transmitter at start-up. Thi s code must be r eceived
and stored by the atomic wall cl oc k i n the fi r st 3 mi nutes of power being supplied to the transmit ter. If the
atomic wall clock has been operating for more than 5 hours, remove batteries fr om the outdoor transmitter and the atomic
wall clock for at least 15 minutes before c om pleting 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 bat teries, please follow the steps
below:
1. Remov e battery cover from atomic wall clock: insert a solid object in t he 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 t he atomic wall clock.
Observe the correc t polarity (see marking inside t he battery c om par tment). The
atomic wall clock will display time and indoor temperature.
3. Within 3 minutes the out door temper ature should be displayed.
4. Keep the at omi c wall clock and transmitter within 10 feet of each other during setup
(15 minutes).
• Do Not Mix Old and New Batteries
• Do Not Mix Alkali ne, Standard, Lithium or Rechargeabl e Bat t eries
Note: If the atomic wall clock does not di spl ay indoor temperature after 60 seconds, rem ove batteries and
wait for at least 60 seconds bef or e r epeating the setup process.
Position the Atomic wall clock
The atomic wall cloc k provides the option of table standing or wall mounting. Before mounting, please check that
the outdoor data can be r ec eiv ed from the desir ed 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 ext ended out by about 0.2” (5mm).
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2. Place the atomic wall clock onto t he screw, using the hanging hole on t he backside. Gently pull the atomic wall clock
down to lock the screw into plac e.
3. Choose a location 6 f eet or more from elec tronics such as cordless phones, gaming systems, televisions,
microwaves, routers, etc.
4. Place within range of t he outdoor transmitter.
5. The maximum transmitti ng r ange in open air is 200 feet (96 meters). Obstacles such as walls, windows,
stucco, concret e, 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 exter ior wall.
Positio n t he Outdoor Tra ns m itt e r
To achiev e a true temper ature 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-faci ng wall. The transmission range is 200ft(open air). Obstacles such as walls, c onc r ete, and large metal
objects can reduce t he r ange. Plac e both units in desired location, and wait approximately 15 minutes befor e
permanently m ounting to ensure that there is proper recepti on.
Wall Mount:
1. Remove the mounting brac k et f r om the outdoor temperature sensor .
2. Place the mounting brac k et in the desired shaded location (wall or t able) .
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 fl ush with the
bracket. Do not over-tighten.
5. Insert the outdoor temperature sensor into the brack et.
Note: Mounting wit h adhesive tape is not recommended as a permanent mounti ng sol ution. Only use adhe sive tape
during set-up process.
Care and Maintenance
• Do Not Mix Old and New Batteries
• Do Not Mix Alkaline, Standard, Li thiu m or Rech argeable Batteries
• Do not expose the atomic wall clock to extrem e temperatur es, v ibration 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 childr en.
• The product is not to be used for medic al pur pose or for publi c information, but is determined f or home use only .
• The specifications of t his product may change without prior notic e.
• Improper use or unauthoriz ed opening of housing will void the warranty .
• If the unit does not work properly, change the batteries.
Specifications
Temperature measu rin g 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 t his 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 humidit y: 20% to 95% with 1% resoluti on
(“- -“ is displayed if outside the range)
(“19%” i s di spl ay ed below 20%; "96%“ will be displayed above 95%)
Temperature and humidity checking interval:
Indoor: Every 8 or 16 seconds
Outdoor: Every 4 seconds
Humidity: Every 65 seconds
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Transmission distance:
Maximum: 200 feet (60 meters) in open air
Power consumption (Alkaline batteries recomm ended)
Atomic wall clock: 2 x AA, 1.5V batteries
TX40U-IT Temp Sensor: 2 x AAA, 1.5V batteries
Battery life:
Atomic wall clock: approximately 24 months
TX40U-IT Temp Sensor: approximately 12 months
Dimensions (L x W x H)
Atomic wall clock: 9.17“ x 1.16“ x 8.30“ (233 x 29.4 x 210.8 mm)
TX40U-IT Temp Sensor: 1.27" x 0.55" x 3.40" (32.4mm x 14.1 x 86.5mm)
Warranty Information
La Crosse Tec hnology, Ltd provides a 1-year limited warranty on t his product against manufacturing def ec ts 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 servic e, t he pur c haser must c ontact La
Crosse Technology, Ltd for problem determination and service pr oc edur es. Warranty service can only be perfor med by a
La Crosse Tec hnology, 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 Technol ogy, Ltd’s authorized servi c e c enter.
La Crosse Tec hnology, Ltd will repair or replace this product, at our option and at no charge as stipulated herein, wit h new
or reconditioned par ts or products if found to be defective during the limited warranty peri od specif ied above. All replaced
parts and products become the property of La Crosse Technology, Ltd and must be retur ned to La Crosse Technology,
Ltd. Replacement parts and products assume the remaining ori ginal warranty, or ninety ( 90) days, whichever is longer.
La Crosse Tec hnology, Ltd will pay all expenses for labor and material s for all r epair s covered by this warranty. If
necessary repairs are not c overed by this warranty, or if a product is examined which is not in need or repair, you will be
charged for the repair s or exami nation. The owner must pay any shipping charges incurr ed in getting the La Crosse
Technology, Ltd product to a La Crosse Technology, Ltd authorized service c enter. La Crosse Technology, Ltd will pay
ground return shippi ng c har ges 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 spec ified
exceptions: (1) dam age c aused by acc ident, unreasonable use or neglect (i ncl uding the lack of reasonable and necessary
maintenance); (2) damage occurring during shipment (claims must be presented to the carri er ) ; (3) dam age to, or
deteriorati on of, any ac c essory or decor ative surface; (4) damage r esul ting from failure to follow instructions contained in
the owner’s manual; (5) damage resulting from the performance of repairs or alter ations 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 inabil ity to receive a signal due to any source of
interfer enc e.. This warranty cov er s onl y act ual 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 misrepresentati on by the seller or
performance variations resulting from installation-related ci r c um stanc es.
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 giv es 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 dam ages ther efore the above excl usi on of limitation may not apply to
you.
For warranty work, technical support, or information contact:
La Crosse Tec hnology, Ltd
2817 Losey Blvd. S.
La Crosse, WI 54601
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Contact Support : 1-608-782-1610
Product Registr ation:
www.lacrossetechnology.com/support/register
Online at:
http://www.lacrossetechnology.com/8140
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, th er e 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:
• 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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