Weems & Plath 4003 User manual

2 Year Warranty
ELECTRONIC MARINE
BAROMETER
#4003
08/2021

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INSTRUCTION MANUAL
e Weems & Plath Company Story ...............................................
Getting Started .................................................................................
Box Contents .........................................................................
Care Instructions ...................................................................
Technical Specications .........................................................
Operating Instructions ....................................................................
Power Methods .....................................................................
Navigation Button Overview .................................................
Upper Screen Icon Description .............................................
Lower Screen Description .....................................................
Initial Setup ......................................................................................
Conguring Settings ..............................................................
Language ....................................................................
Time & Date .............................................................
Measurement Units ....................................................
Pressure ..........................................................
Altitude ..........................................................
Temperature ...................................................
Pressure ......................................................................
Altitude & Pressure Calibration .....................
Advanced Functions Conguration .......................................
Mode Button .............................................................
Backlighting, +1 Hour or -1 Hour, Dual,
Alarm Clock, Buzzer .....................................
Pressure Alarm Function ...........................................
Zoom Function .........................................................
History Function ........................................................
Installation ………….….....……..……..……………........…....….....
Warranty ...........................................................................................
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THE WEEMS & PLATH COMPANY STORY
In May of 1919, eight years before Lindbergh’s famous solo ight, three
small planes set out from Naval Air Station Rockaway,NY headed for Plymouth,
England in an attempt to make the rst trans-Atlantic ight. Only one of them
made it. Twenty-ve hundred feet below on board a station tracking ship, a
young navigator, Lt. Cdr. Philip Van Horn Weems, U.S. Navy, gazed up and
thought there must be a safer and simpler way than using a small armada of
ships as beacons for the ight.
For centuries, man had relied on the heavens, circling planets and the
constant horizon to guide him in his travels. An accurate clock, compass,
sextant and charts were the necessary tools for plotting a course. But these
tools required time for computations and a place to spread out and study the
charts which meant celestial navigation was ill suited for the cockpit. Lt. Cdr.
Weems, a brilliant, inventive and determined young man knew as he tracked
that rst ight that modern navigation needed to change, and he went on to
revolutionize the eld with his ideas, writings and inventions.
e challenge he undertook was complex and involved the invention of
new methods and tools. Weems went on to develop a new kind of sextant and
the Second Setting Watch with its inner rotating dial. He also produced the
famous Weems Plotter, a more precise and easier to use plotting tool, which is
still one of our most popular plotters.
Weems continued to improve the instruments and broaden the applications
of his methods, including radio astronomy, polar exploration and space
navigation. He published numerous articles, taught navigation at the U.S.
Naval Academy, and established his own school in Annapolis to teach e
Weems System of Navigation. Charles Lindbergh studied with Weems before
attempting his trans-Atlantic ight and Admiral Byrd, a classmate of Weems
at the Naval Academy, came to Weems for instruction before setting out for
the North Pole.
A century earlier, Carl Plath’s company in Hamburg, Germany - C.
Plath, had been manufacturing the nest commercial sextants and magnetic
compasses available, including the rst gyrocompass installed on a commercial
vessel in 1913. It was a natural development for Weems’ company to become
the North American source for C. Plath’s ne instruments; hence the alliance
of two distinguished names - Weems & Plath. e exceptional workmanship
that both Philip Van Horn Weems and Carl Plath required in developing the
manufacturing of precision navigation tools remains at the heart of all our
products.
Weems & Plath is still located in the Chesapeake Bay town of Annapolis
where it began over 90 years ago. We are committed to supplying the world
with the nest nautical products available while maintaining the high standards
of service that have distinguished Weems & Plath from its inception.
214 Eastern Ave. Annapolis, MD 21403 | phone [phone] | 410.263.6700 | www.weems-plath.com

GETTING STARTED
ank you for purchasing the Electronic Marine Barometer #4003. is
instrument is designed specically for the mariner. It is a professional quality
air pressure detector that not only shows current pressure on a large display,
but also shows historical information on an expanded scale giving the viewer
the capability to see pressure changes that have occurred over the last 48 hours
in 30 minute increments.
e following pages contain important information to familiarize you with
this multi-function device. Please read fully before using your Electronic
Marine Barometer.
BOX CONTENTS
• 1 Electronic Barometer (#4003)
• 1 wall mount bracket
• 2 screws (to attach wall bracket to device)
• 4 batteries (AA)
• 1 instruction manual
• 1 12V DC connector
CARE INSTRUCTIONS
Do not open the barometer to access the electronic circuits inside; this will
void the warranty. Do not insert a blade, rod, screwdriver or other object into
the air vents; doing so could damage the device and void the warranty.
Handle the batteries carefully:
• Use only premium grade AA batteries.
• Please respect the polarity when inserting batteries.
• Do not place the batteries near a ame or source of heat.
• Batteries may leak when they have been completely discharged. To avoid
damaging the device, please replace the batteries before they die. Any battery
corrosion will void the warranty.
• When the LCD battery indicator shows a low battery level, replace the
batteries. All stored data will be lost if the batteries are fully discharged
and the screen is blank. Data will remain while batteries are changed. Keep
device away from children.
Keep the Electronic Barometer in a clean and dry location. If the device becomes
wet or damp, immediately dry it with a soft dry cloth. To remove salt, sand, dust
and dirt, do not use chemical cleaners or detergents. Instead, wipe with a soft,
slightly dampened cloth. Do not press on the screen or touch the screen with your
ngers or other objects.
Avoid sudden temperature changes. Use and keep your electronic barometer at
normal temperatures (between 14°F and +122°F). Rapid temperature changes
(which can occur when you enter or exit a heated area on a cold day), may result in
the creation of condensation inside the device. To avoid this, place the device in a
bag before exposing it to such temperature changes.
Damage may occur if dropped. Keep device away from strong magnetic elds.
Do not store your Electronic Barometer near equipment which generate magnetic
elds, such as radios, televisions, microwave ovens, computers or cell phones as
these may aect the display or damage the data stored in the device’s memory or
the circuits inside.
TECHNICAL SPECIFICATIONS
Air Pressure:
Accuracy: +/- 0.5 mb
Resolution: 0.1 mb
Linearity: +/- 0.2 mb
Temperature:
Accuracy: +/- 0.5° to 25°C - /Resolution : 0.1°C
Humidity:
Accuracy: 5% - Resolution: 1%
Clock:
Dimensions:
6.5” x 4.06” x 1.18” (165mm x 103mm x 30mm)
Weight:
215g (7.58oz) without batteries
280g (9.88oz) with batteries
Multiple Function Displays Include:
• Audible gale warning alarm
• 2 to 48 hour history display (2, 4, 6, 12, 24, & 48 hour increments)
• Temperature (°F & °C) /Relative % Humidity
• Dual time zones
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Available Separately:
AC adapter (#4002A)
Time Display Hour, Minutes in 12 or 24 hour Mode
Accuracy +/- 30s per Month
Date Display Month, Day

POWER METHODS
ere are three ways to power the Electronic Barometer:
1. Mini USB Connection - for power only
2. 12 Volt DC Connection - the white striped wire connects to positive (+)
port on power supply
3. Battery Operation - 4 AA batteries (included); battery life is up to 5
months with standard use
AC adapter is available separately (item #4002A).is adapter converts DC
power to AC without using a mini-USB connection.
NOTE: Frequent use of backlighting function will diminish battery life.
NOTE: If connected to USB or 12 volt DC power source, you can leave batteries inside as
a backup if the power is distrubted. If the battery power is low, the Low Battery icon will
display even if the power supply is plugged in.
NAVIGATION BUTTON OVERVIEW
M(orange) Button
• Pressure Alarm - hold 1 second
• Alarm Clock – hold 1 sec
• Settings – hold 1 sec
• Exit
G(“Return”)Button
• Allows viewer to review specic data points in pressure chart history
• Return or step backwards
▲Button
• Allows viewer to increase the time scale on the pressure chart history
• Increase values during initial set up
OK Button
• Used to activate the alarm
• Validates set up information
▼Button
• Allows viewer to decrease the time scale on the pressure chart history
• Decrease values during initial setup
Backlighting – one brief touch of any button
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OPERATING INSTRUCTIONS
Ports:
1. Top - Speaker Out
(non-functioning)
2. Mini USB -
For power only
3. DC 12V 0.3A
External Power
4. ON/OFF Switch

1. Loosen 2 screws on back and remove mounting bracket to expose battery
compartment.
2. Remove battery compartment cover and install the 4 provided AA batteries
(as indicated in housing cutouts). Replace battery cover.
3. To begin setup,turn on the device using the ON/OFF switch on the lower
left side. NOTE: When the Electronic Barometer is turned o or the batteries
are changed, your pressure chart history will remain when it powers back on but
you will need to reconrm the language, year, month and date settings.
e setup is carried out by pressing the navigation buttons. ▲and ▼are
used to increase or decrease the values displayed on the screen.
Pressing the G (“Return”) button allows you to return to the previous step.
e OK button validates the information and takes you to the next step.
4. Follow the manual step by step. You may return to a previous step by
pressing the Gbutton. All data must be entered before leaving the setup
mode. e lower LCD screen will display the steps that need to be taken.
NOTE: If no button is pushed within 28 seconds, the display returns to the chart history.
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UPPER SCREEN Upper Screen ICON Descriptions
POWER – animated phasing moon;
pauses for 25 seconds to display the
current phase of the moon. When the
icon is animated, it indicates the unit is
powered on and working.
ALARM CLOCK – displays only if
alarm clock function is enabled.
DUAL – displays when the clock is set
to monitor two time zones. e icon
will appear each time the second time zone is displaying.
TEMPERATURE – shows temperature in °F or °C as per initial set up.
HYGROMETER – shows relative humidity in percentage.
GALE WARNING – appears when a drop in air pressure of 3 hPa (millibars) or
greater over a period of 3 hours or less is detected. An audio alarm will sound when
the air pressure drops unless the buzzer is turned o. NOTE: is alarm is always
on. It cannot be switched o.
AIR PRESSURE – shows air pressure in hPa (millibars) or in Hg as per initial set up.
ALR. – is displayed when the preset target alarm goes o. NOTE: is is unrelated
to the gale warning alarm.
BUZZER MODE – the X over the top of the speaker icon indicates that the
buzzer is switched o. In this case, all alarms are sound-free and will only be
indicated by the text in the lower screen.
MIN. – displays when HISTORY function is in use,if a data point is the minimum
value during that period.
MAX. – displays when HISTORY function is in use,if a data point is the maximum
value during that period.
LOW BATTERY – displays only when remaining energy in batteries is low.
Batteries should be replaced within a few days to prevent data loss and battery
leakage.is icon will show even when the USB or 12 volt power supply is in use.
LOWER SCREEN Lower Screen Description (see image on p. 7)
A chart (barograph) displays the most recent air pressure in 2, 4, 6, 12, 24 or 48
hour increments. Use the ▲and ▼buttons to adjust the chart scale.
After initial set up is complete you can begin to congure various advanced
functions with your preferences.
INITIAL SETUP
e lower screen of the Electronic Barometer
Upper LCD Screen
Navigation Buttons
Lower LCD Screen
ON/OFF Switch
Power Icon
Gale Warning
Buzzer Mode
Alarm Clock
Alternating
Time & Date

CONFIGURING SETTINGS
To access the system settings, press and hold the orange Mbutton until the main
menu appears on the lower screen. en use the ▼button to move the cursor to
“settings” and press OK .
LANGUAGE:
e Electronic Barometer can be used in the following languages: English, Dutch,
French, German, Italian, Scandinavian, Spanish and Swedish.
English is the default language, however to select a dierent language follow the
steps below.
Within the SETTINGS menu, the cursor will be pointing at “language.” Press the
OK button to select. e next screen will show a list all the available languages.
Use the ▲ and ▼buttons to move the cursor to the desired language and press
OK to select.
TIME & DATE:
Format
Press the Gbutton to return to the “SETTINGS” menu, then use the ▼
button to move the cursor to “time date” and press OK to select. e cursor
will now be pointing at “format.” Press the OK button. Select “12/24 hours”
to congure how you would like the time to be displayed and “date format”
to congure how you would like the month and date to be displayed.
NOTE: On the “12/24 HOURS” screen, select “am/pm” if you want the time to
be shown in a 12-hour format.
Time
After conguring the format of the time and date, the screen will return to
the “FORMAT” menu. Press the Gbutton to return to the “TIME DATE”
menu. en use the ▼ button to move the cursor to “time” and press OK .
Now set the time by pressing the ▲button to increase the value or ▼button
to decrease the value for the hour and then minute. Press OK each time you
have arrived at the correct value.e arrow cursor will automatically move to
the next task when you push the OK button.
Date & Year
Follow the same procedure as above for the date and year: Press ▲or ▼to
increase or decrease the value for the month and then day. en repeat this
process to set the correct year.
MEASUREMENT UNITS:
Units of air pressure, altitude and temperature are adjustable. Press the Gbutton
to return to the “SETTINGS” menu and then use the ▼ button to move the
cursor to “units.” Press OK and you will see a screen with the following 3 choices:
pressure unit, altitude unit and temperature unit.
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• Pressure Unit:
e cursor should now be pointing at “pressure unit.”Press the OK button.Now
choose the unit of measure for atmospheric pressure. Your choices are: “hpa”
(NOTE: Hectopascal, a metric (SI) measurement unit of pressure. e hectopascal
is equivalent to millibar and commonly used to measure atmospheric pressure) or
“InHg”(inches of mercury). Click OK once you have made your choice using
the ▲or ▼ buttons.
• Altitude Unit:
e altitude screen oers meters and feet. Use the ▲and ▼ buttons to select
preference. Press OK .
• Temperature Unit:
Select °C (Celsius) or °F (Fahrenheit) with the ▲and ▼buttons. Press OK .
PRESSURE:
e pressure value can be displayed either in ‘actual adjusted pressure’ or in
‘pressure at sea level’ (when the altitude is set to 0 meters/feet). You must decide
if you want to see the actual pressure at the current elevation of the barometer or
the pressure at sea level.
NOTE: If you choose to show the pressure from an altitude that is above sea level, the sea
level pressure will be a higher value by about 1 mb for every 27.4 feet that the barometer
is above sea level.
Altitude & Pressure Adjustment/Calibration:
To adjust the altitude and pressure, return to the “SETTINGS” menu and
select “pressure”using the ▼and OK buttons.en use the ▲and ▼ buttons
to increase or decrease the value for altitude. e default value is “0” but you
can set the altitude between 0 and 3995 m/13,100’. Each time you press the
▲and ▼buttons the value will change by 1 meter. When the desired value
is displayed, press OK .
Repeat this process to adjust the pressure shown under “0 adjust” on the
“PRESSURE” screen. Each time you press the ▲or ▼buttons the pressure
value will increase or decrease by 0.1mb to a maximum of +/- 10 mb or by
0.01 InHg to a maximum of +/-0.3 InHg.
e initial setup of your Electronic Barometer is now complete. Press the orange
Mbutton to return to the chart history screen.
Pressure Altitude Temperature
Mb Meter °C
InHg Feet °F

ADVANCED FUNCTIONS CONFIGURATION
MBUTTON:
Pressing and holding the Mbutton will take you to other setup parameters
displayed on the lower screen:
• Backlighting
• +1 Hour or -1 Hour
• Dual
• Alarm Clock
• Buzzer
Backlighting – screen backlighting can be adjusted in the “SETTINGS”
menu. Press the ▼ button until the cursor points to “Backlight” and press
OK . Choose one of 4 levels of light intensity. e lower screen will display
“BACKLIGHT” and the cursor will point to “Level.” Each time you press
the ▲or ▼buttons the lighting level will increase from 0 to 1 to 2 to 3. e
number 0 turns the backlight o. When you’ve reached the desired level, press
OK .
Now follow the same procedure for “time out”- the length of time the backlight
will stay on when no buttons are pressed.
NOTE: Backlighting requires a great deal of energy and reduces battery life.
+1 Hour or -1 Hour – by selecting either “+1 HOUR” or “-1 HOUR” within
the “TIME DATE” menu, you can manually change to and from Daylight Savings
Time or set a second time zone which will show on the upper screen.
+1 hour: adds 1 hour to the displayed time
-1 hour: subtracts 1 hour from the displayed time
Dual –allows you to activate a second time zone by increasing or decreasing
the hour according to the time dierence. is function is found within the
“TIME DATE” menu and the word “Dual” will appear next to the second
time zone when it displays on the upper screen (the two times will appear
alternately). To stop the Dual function, set
the time dierence to 0 in the menu.
Alarm Clock – to activate the alarm clock,
select “alarm clock” in the main menu using
the ▼and OK buttons.e cursor will now
point at the “hours” value. Use the ▲and
▼buttons to set the hour that you want the alarm to go o. Press
OK to
move to the “minutes” value.e alarm clock icon will now be displayed on the
upper screen. e alarm will sound at the time you set. To quiet alarm when it
sounds, press the OK button. Turn the alarm o by returning to “alarm clock”
in the main menu. is time the cursor will be pointing to “stop.” Press OK
to conrm that you want to turn the alarm o. You will notice that the alarm
icon on the upper screen is gone. If you decide not to turn the alarm o, select
“continue” with the ▼button and then press OK to conrm.
Buzzer – found in the “SETTINGS” menu, “buzzer” allows you to set the
volume levels of the alarms and button “beeps.”ere are 4 settings for each –
0, 1, 2, 3. When “beep vol.” is set to 0 the buzzer is turned o and you will not
hear “beeps” when the buttons are pressed. e default volume for this setting
is 1 – the softest.
Similarly, when “alarm vol.” is set to 0 the alarm sound will be turned o
(NOTE: the lower screen will ash to let you know that the alarm is going o).e
default volume for this setting is 3 – the loudest.
PRESSURE ALARM:
With this function you can set alarms for air pressure variations – either rising
or falling (0.5 to 10 mb in 0.5 increments) for set periods of time ranging 1 to 6
hours or for a target air pressure value.
Set Pressure Alarm:
Press the OK button for 1 second and press OK again to select “pressure
alarm.”e dialogue box in the lower screen will read:
Drop
Increase
Target
Navigate the cursor by using the ▲, ▼
and OK buttons to select which alarm you
want to set.
Repeat this process to set the value and duration for that alarm. You can also
set a target value of a specic air pressure reading so that the alarm will sound
when this value is reached.
When an alarm function is setup, the “PRESSURE ALARM” menu will
show “Active” next to that alarm.
NOTE: e alarm for pressure variations is based on real pressure changes even
if the pressure is set to reduced “sea level pressure.”
Alarm OFF:
Navigate to the “PRESSURE ALARM”
menu and select the alarm you want to
turn o. e previously recorded data
will appear in the dialogue box and the
cursor will be next to “stop.” Press OK .
When an alarm function is turned o, the
“PRESSURE ALARM” menu will show
“Inactive” for that alarm. Press the OK button to return to the chart screen.
Modify Alarm:
To modify an alarm, you must rst deactivate the alarm and then reset it.
Silence Alarm:
When the alarm sounds, a message is displayed in the dialogue box showing
the current alarm setting.e buzzer will go o for 3 seconds and then stop;
but the message will continue to display. Press OK to silence the alarm.
1110

We strongly recommend that you mount the Electronic Barometer to the wall
using the included wall mount bracket rather than setting it on a at surface.
NOTE: Install batteries before installing device on wall. Be sure to leave a space above
the unit to access top mounting bracket screws.
Snap the wall mount bracket onto the rear of the barometer and reinsert the screws
to keep it secure. See image below for proper positioning.
INSTALLATION
1312
ZOOM FUNCTION:
is function allows you to zoom in on the chart history screen to see pressure
movement in 2, 4, 6, 12, 24 and 48 hour increments. Adjust the zoom increments
by pressing the ▲and ▼buttons.
HISTORY FUNCTION:
This function allows you to review past barometric pressure readings at any time.
Press the G button to initiate the History function.en use the Gbutton to move
the vertical line toward the left or the OK button to move the vertical line to
the right. As the line moves along each point on the graph, the upper screen will
display the barometric data for that point.
Time Interval Zoom MB Scale
1 min 2 hours 8 mb
2 min 4 hours 10 mb
3 min 6 hours 16 mb
6 min 12 hours 20 mb
12 min 24 hours 20 mb
24 min 48 hours 30 mb
Your Electronic Marine Barometer is warranted against defects for two years. Any
modications made to the barometer will void the warranty.
WARRANTY
Weems & Plath tWo (2) Year WarrantY
Your Weems & Plath product is warranted against defects in
material and workmanship for two (2) years from the date by
original purchase. Retain a copy of receipt for proof of purchase.
Any defect caused by misuse, accident, tampering or negligence
of the user is not covered by this warranty.
Caution: If your product is battery operated, movement damage caused by
battery leakage is not covered under warranty. A clock movement continues
to pull voltage from the battery until the battery dies. Leaving a dead battery
in place causes the battery to leak acid which destroys the movement. For
this reason, it is important to replace the battery once a year, even if the
battery is not dead at the time of replacement. If the instrument is not in
use,remove the battery to reduce the possibility of costly movement damage.
Weems & Plath
214 EASTERN AVE. • ANNAPOLIS, MD 21403
USA 410-263-6700 • fax [phone]
e-mail: [e-mail]
www.weems-plath.com
Product registration
In order to provide the best service possible, please register your product
online at www.Weems-Plath.com. Your registration serves as proof of
purchase and activates your warranty.

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