Chaney Instrument acurite weather station 사용자 설명서

Acu-rite barometers measure atmospheric pressure by means of changes of shape of a small chamber with a partial vacuum. As atmospheric pres-
sure varies on the chamber and changes shape, it moves a small drive linkage connected to the indicator hand. This linkage movement rotates the
hand to register changes in pressure.

Unlike the thermometer and hygrometer instruments, the barometer is not affected by location. Because all buildings have some air leakage, the
atmospheric pressure is the same indoors as it is outdoors.

The barometer has been regulated at the factory to function accurately at 950 ft. above sea level. If the altitude in your location is different, the barom-
eter must be re-adjusted or reset using either of the following methods:
1. Contact your local radio/TV weather service to get the correct barometric pressure reading for your location. Now set your barometer to that reading
by using a blade screwdriver to turn the small adjustment screw located in the back of the barometer instrument case. Turn the screw to the left or
right until the indicator hand moves in the direction you want. Continue to turn the screw until the indicator hand is registering the correct pressure. Tap
the lens "set Knob" lightly to ensure that friction from the linkage is not affecting a correct reading by the indicator.
CAUTION: Be careful not to force the adjustment screw. If the screw becomes tight in either direction, the end of the adjustment range has been reached

2. Use an existing barometer at your location which is known to be accurate and set the new Acu-rite barometer to the same reading using the same pro-
cedure as outlined in step one.

The Acu-rite barometer shows metric scale (millibars) and the traditional scale (inches) as used in the U.S.A. and some other countries.

The capability of a barometer to indicate changes in atmospheric pressure makes it a valuable instrument in weather forecasting. You should take read-
ings at least once daily, and always adjust the lens "set knob pointer" at the exact location of the indicator hand at the time of your reading. The "set knob
pointer" will allow you to tell what changes in pressure have occurred since your last reading. Remember that the rate of pressure change is just as impor-
tant as the amount of change. This is why multiple readings each day are best for accurate weather forecasting.

For the most accurate atmospheric pressure reading, it is a good idea to first lightly tap the lens before checking the exact position of the indicator hand on
the dial.

The following meteorological "Rules of Thumb" will help you interpret your Acu-rite barometer readings.
1. A fast rise in barometric pressure typically indicates good weather of short duration can be expected.  2. A rapid drop in barometric pressure typically
indicates that weather disturbances are nearby and could result in showers of short duration.  3. Regular elevation of barometric pressure typically indi-
cates that clear dry weather (cold and dry in winter) can be anticipated.  4. A slow but continuous drop in barometric pressure typically indicates that per-
sistent bad weather can be expected.  5. Slow atmospheric pressure drops of 2 to 3 tenths of an inch per 24 hours typically indicates a depression of
some distance away.  6. Pressure drops of 1 to 2 tenths of an inch per hour typically means weather disturbances nearby of short duration.  7. Steep pres-
sure drops of 6 tenths of an inch or more within a 4 to 5 hour period typically indicates approaching rain and storms with strong winds.

Remember that many factors determine actual weather conditions, Geographic location, temperature, humidity, wind direction, and even the season must
be considered when your barometer indicates a rising or falling atmospheric pressure.

The following "Weather Forecasting Guide" should prove to be an interesting and useful reference in your efforts to track and record the barometric
changes and resulting weather patterns in your location.

Southeast rains with high winds

Continued cool, warmer and cloudy tomorrow

Clear tonight, continued cool with variable winds

Fair and warmer, followed by wind and rain

Generally fair, probably cool with variable winds

Storm brewing in the direction of the wind

Fair with brisk winds which will diminish

Cloudy and warmer followed by unsettled

Fair with fresh winds tonight and tomorrow

Unsettled, increasing winds and warmer

High winds with cool wave preceded by squalls

Clearing, slight squalls fair and cooler tomorrow

Clearing with high winds and cool wave

Falling below 29.00 indicates a severe storm, in 

winter snow or cold wave in 24 hrs.

Clearing and colder

31.00

to

30.80

to

30,50

to

30.20

to

29.90

to

29.60

to

29.30

to

29.00

or

Below

31.00

to

30.20

to

30.00

to

29.80

or

Below

Unsettled, increasing winds and
warmer

If westerly wind,then fair, followed
within two days by warmer and rain

If winds south to west, then clearing
and colder within 12 hours

If winds going to west, then clearing
and colder

If winds south to east, then warmer, rain within 36 hrs. if winds west to north, then cold and clear, quickly
followed by warmer & rain

If winds south to east - then warmer and rain within 24 hours

If winds southeast to northeast, then rain with high wind followed within two days by clearing and colder

If winds southeast to northeast then severe storm of wind and rain imminent. In winter, snow or cold 
wave within 24 hours

If wind east to north then severe northeast gales and heavy rain/snow followed in winter by cold wave