User manual CHANEY INSTRUMENT ACURITE WEATHER STATION

[. . . ] Once again, be sure to dry the lens and bezel with a soft cloth after cleaning. HOW YOUR WEATHER STATION INSTRUMENTS WORK DIAL THERMOMETER The dial thermometer is designed for indoor use only and will provide an accurate measurement of air temperature in the vicinity of the instrument. Dial types thermometers are operated by sensitive bi-metal coil spring mechanisms that respond to air temperature changes. The thermometer instrument has been calibrated at the factory and should not need adjustment. As with all instruments that are placed in a new location, you should always allow a period of several hours for stabilization before determining whether it is reading accurately. [. . . ] Low humidity levels can cause health problems and can be hard on wood furnishings. Acu-rite hygrometers are preset at the factory and typically should need no further adjustment. Remember to allow ample time for the instrument to "stabilize" in its new location before determining whether accurate humidity levels are being indicated. If you do decide that the instrument needs readjustments, this can be done as follows: Soak a folded face cloth or dish cloth with water and place the cloth on a plate, saucer, or another relatively flat container. Remove the hygrometer from the weather station plaque by simply placing your hand against the back plate and pushing the instrument out of its mounting hole. Remove the backplate and carefully lay the back edge of the hygrometer flat on the damp cloth. Allow 30-45 minutes for the hygrometer to read approximately 95% humidity. If this reading is not indicated, carefully rotate the "U" bracket (holding the coil between your thumb and forefinger) counter clockwise until the indicator hand is reading 95%. Replace the backplate and remount the hygrometer into the wood plaque. The hygrometer will gradually return to indicate the actual condition of the air moisture content. IMPORTANT: Any other method than what has been described to adjust the hygrometer could damage the instrument. DIAL BAROMETER Acu-rite barometers measure atmospheric pressure by means of changes of shape of a small chamber with a partial vacuum. As atmospheric pressure 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. If the altitude in your location is different, the barometer 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. [. . . ] A slow but continuous drop in barometric pressure typically indicates that persistent bad weather can be expected. Slow atmospheric pressure drops of 2 to 3 tenths of an inch per 24 hours typically indicates a depression of some distance away. Pressure drops of 1 to 2 tenths of an inch per hour typically means weather disturbances nearby of short duration. Steep pressure 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. [. . . ]