General Instructions for setting up Barometers, Hygrometers and Thermometers.
Barometer
Instructions For Your Aneroid Barometer
This barometer was designed to
give the user accurate air pressure readings from sea level to an altitude of
7000 feet. Before leaving the factory your barometer was calibrated to standard
air pressure at sea level. For your barometer to give you optimum results, you
will have ro re calibrate it to your local barometric pressure before
use.
Locate your barometer in an are where it will remain undisturbed. Do
not position it in direct sunlight, as this could cause inaccurate
readings.
You need to calibrate your barometer to your location. This can
be done by getting the local pressure from a local radio or television station.
Use a small slotted screwdriver to turn the small screw on the back of the
barometer case to adjust your barometer until the black pressure indicator hand
points to a reading that corresponds to your known local barometric pressure.
Your barometer has now been calibrated.
For daily operation of your
barometer, place the gold pointer attached to the lens directly over the black
pressure indicator hand.
This will allow you to measure any change in
pressure that may have taken place. It is the amount of change in pressure and
the rate of that change that will be an indicator of the weather.
The
following basic rules will hold true in using the barometer to predict weather
conditions:
A fast rise in barometric pressure means good
weather of short duration.
A rapid drop in barometric
pressure means disturbances nearby - showers of short
duration.
Regular elevation of barometric pressure usually
will indicate clear, dray weather conditions (cold and dry in the
winter)
A drop of 2-3 tenths of an inch per 24 hours
indicates a depression some distance away.
Drops of 1-2
tenths per hour means disturbances near by, of short
duration
Steep drops of 6-10 tenths within a 4-5 hour period
indicates coming rain and a storm with strong winds.
Operating tolerance +/- 0.2"
Hygrometer
Instructions For Your Hygrometer
This hygrometer was designed to
measure relative air moisture indoors. It measures the amount of water vapor
present in room air as compared to the maximum amount of water vapor that could
be present (100%). This hygrometer must be keep in a mildly humid environment to
work properly.
Your hygrometer was preset at the factory and will not
normally need adjustment. It must be allowed to stabilize for 1-2 days in the
environment in which it will be used before attempting any
adjustment.
All that is normally required is an initial "moisture
charge". To do this, place a damp cloth on the back of the instrument for 20
minutes. This cloth should only be damp because any water droplets that would
come in contact with the spring inside the hygrometer would ruin the instrument.
Once the cloth is removed the hygrometer should read about 95% (between 90% and
100% is acceptable).
If you find that an adjustment must be made, then do
so very carefully. If you look through the back of the instrument you will
notice a coil spring that is held in place by a gold color support bracket. This
support bracket lies against the dial and has a small tab that comes away from
the dial at a right angle (). This small tab has red plastic pin going through
it and holding the coil in place. Do not touch this red plastic pin or the coil
at any time. To adjust the reading on the dial of your hygrometer, use a small
screwdriver to push on the side of the metal tab. This will turn the entire
support bracket. The support bracket should be turned in whichever direction
will give you the reading that you desire. Please remember that a hygrometer
reacts very slowly to changes in the environment. Allow 24-48 hours once the
instrument has been located before determining if the instrument is operating
properly.
Operating tolerance +/- 5%
Thermometer
This dial thermometer is designed for indoor use only and provides an
accurate measurement of air temperature in the immediate vicinity of the
instruments location. Please locate the instrument indoors in a location that
represents average air temperature. Avoid locations next to drafts, ovens, air
conditioners or heat registers.
Your thermometer was pre set at the
factory and will not normally need adjustment. Allow the thermometer to operate
for at least 24 hours once it has been located before determining if it is
operating properly.
If you find that an adjustment must be made, then do
very carefully. If you through the back of the instrument you will notice a coil
spring that is held in place by a gold color support bracket. This support
bracket lies against the dial and has a small tab that comes away from the dial
at a right angle (). This small tab has a red plastic pin going through it and
holding the coil in place. Do not touch this red plastic pin or the coil at any
time. To adjust the reading on the dial of your thermometer use a small
screwdriver to push on the side of the metal tab. This will turn the entire
support bracket. The support bracket should be turned in whichever direction
will give you the reading that you desire.
