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BAROMETER
Lifetime Warranty
214 EASTERN AVE. • ANNAPOLIS, MD 21403 • USA
410-263-6700 • fax 410-268-8713
E-mail: [email protected]
www.weems-plath.com
08/2018
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OPERATING INSTRUCTIONS
A barometer is an instrument used to predict a change in weather
by measuring variations in atmospheric pressure or the weight of the
air around us. e barometer will normally indicate changes in weather
12 to 24 hours in advance; it is not an indicator of present weather
conditions. Barometric pressure is the same indoors as outdoors.
Your barometer is an aneroid type which measures atmospheric
pressure mechanically without use of liquids. An evacuated hollow
metallic diaphragm is employed to actuate a pointer indicating
atmospheric pressure.
Do not take any notice of the words Rain, Change, Fair. ey are
a traditional graphic decoration found on all barometers. At sea level,
the normal atmospheric pressure is about 30 inches. Very rarely will the
needle ever exceed 30.5 or drop below 29.5. Sometimes it is possible
for the pressure to change only one or two tenths of one inch over a
week, even a storm may cause only a half inch of change.
When your barometer left the factory, it was set at standard
sea level which is the standard setting for weather observation.
e movements used in Weems & Plath® barometers are adjustable
up to an altitude of 3,500 feet. e pressure will decrease as your
altitude increases. It is necessary for you to adjust your barometer
to the atmospheric pressure in your geographic area by means of
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the small screw found on the back of the movement. To access the
screw, expose the back of movement (never turn this screw, in either
direction, more than one full rotation).
Contact your local weather bureau for present atmospheric
pressure and adjust your barometer accordingly. For every 100 feet in
altitude, an adjustment of 0.11 inches is required (1000 ft. = 1.1 inch).
Set the moveable pointer with the knob at the center of the
glass cover, to the present atmospheric pressure. is will allow you
to return to the barometer after time has passed to determine if the
atmospheric pressure is rising or falling.
BAROMETER TROUBLESHOOTING
Indicator Needle Does Not Move:
1. Place the movable pointer over the indicator needle (usually black)
and wait a few days to see if indicator needle moves. When atmospheric
pressure is steady the needle will not move. Waiting for weather change
over a period of days will determine if the needle is moving properly.
2. Place the barometer in a clear, plastic bag trapping air inside with the
barometer. Hold the bag opening closed and push on the bag to increase
air pressure which will cause the indicator needle to move.
3. If the needle does not move after trying #1 and 2, return for service.**
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Indicator Needle Shows Incorrect Reading:
1. Adjust the slot head screw in the back of the movement by turning
either left or right to bring the needle to the correct reading.
2. If it still is not working correctly after setting the needle and watching
for a few days, please return for service.**
**When returning for service, package carefully as Weems & Plath® cannot be
responsible for damage in transit. Fill out and include the Request Repair Form
found on the Support page of the Weems & Plath website or write a note with
your contact information and a description of the problem.
Send To:
WEEMS & PLATH
214 EASTERN AVE. • ANNAPOLIS, MD 21403 • USA
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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