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Shop > Oregon Scientific > WMR968
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Oregon Scientific Cable Free™ Weather Station
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No more stretching wires under windows and through walls! Now you can monitor weather and environmental conditions in and outside of your home or office with this complete Cable Free™ Weather Station. Innovative wireless outdoor sensors operate on solar power for simple installation and sophisticated use.
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Oregon Scientific Cable Free™ Weather Station
Frequently Asked Questions:
Cable Free Weather Stations and Desktop Units
1. What is the standard atmospheric pressure?
The standard atmospheric pressure is the pressure of 1013.25 mill bars (mb), 29.92 inches of mercury (Hg), 760 millimeters of mercury (mm), 14.7 pounds per square inch (lb/in), 101,325 Pascal (Pa).
2. Where I can find a websites that would give me more information about barometric pressure?
Here's a link to USA Today's informative weather pages: http://www.usatoday.com/weather/wbarocx.htm
3. What is the high and low barometric pressure mean?
At the high barometric pressure situation an air is compressed a pushing down. At the low barometric pressure situation an air is rising
4. Could you please explain the barometric pressure changes and it's connection to the weather forecast?
Rain means a low barometric pressure and rising air.
Dry and sunny weather condition means high barometric pressure and compressed (down) air.
5. What barometric pressure is the default pressure reading on the main display?
The receiver's (display's) default barometric pressure reading is an actual (station) pressure for your house elevation in a 20 miles radius.
Barometric pressure sensor BTHR968 measures an actual barometric pressure of the environment and sends this information to the control display.
6. What is it "sea level" barometric pressure?.
The "sea level" barometric pressure mode reflects the air pressure adjusted to the elevation of your local weather source information; such as the TV broadcast station or local airport. This barometric pressure value is user { adjustable.
7. Which barometric pressure is connected to the weather forecast?
The weather forecast mechanism depends on actual (station) barometric pressure change.
Each segment shows an air pressure change (thinner or thicker) { 2 MB per every 6 hours.
To display barometric pressure for any hour for the past 24 hours, press UP or DOWN arrows on the display control panel.
8. My barometric pressure sensor BTHR968 shows 29.09 inHg, while the local airport pressure register 29.86. My elevation is 500 feet above the sea level. Why these measurements are different?
BTHR968 barometer reads the station pressure for your house elevation (500 ft). The local airport barometric pressure instrument shows the pressure for an airport elevation. The difference in elevations for two different locations makes the barometric pressure readings different, so the display reading is correct.
9. What powers the weather station elements?
Outdoor weather station elements (such as temperature sensor, anemometer and the rain gauge) are powered by the solar power and have 2 AA alkaline or (for the winter time) lithium batteries for the backup.
BTHR968 as an indoor element powers by 4 AAA alkaline batteries and the control display (receiver) powers by AC adapter and 4 AA alkaline batteries for the backup.
10. How I can calculate solar radiation energy?
In order to perform calculations, the total amount of solar radiation energy is expressed in hours of full sunlight per square M (meter), or Peak Sun Hours.
11.What factors have an influence to the solar radiation intensity?
Power of the solar system varies depending on the geographical location.
If an average of 6 hours of peak sun per day is available in the area, then the solar panel can produce the power per day that needed for the normal transmission.
12. How many hours solar transmitter can work without a direct sunlight and without the backup batteries?
More than 24 hours
13. What is the average life for the lithium battery in the solar transmitter?
20 months
14. What is the average battery life for the alkaline battery in the solar transmitter?
10 months
15. Where I need to place my solar panels in order to receive a maximum sunlight?
The positioning is critical for the solar panel maximum charge. They should be placed due south and receive sun all day. The angle is also important { at equator they should point straight up (90 degrees angle). To get the best angle at spring and fall you need to subtract your latitude from 90 degrees angle. Since the sun is lower in the winter and days are shorter, you can subtract about 20 degrees to maximize an available sunlight. During the summer time add 20 degrees.
16. Is it possible to disable a beeping signal that generates after pressing the display's touch screen using a control panel's key?
Unfortunately, not.
17.How often does the system update each parameter?
An update time is different for each remote sensor:
1. RGR (Rain gauge) { 47 sec
2. BTHR918 (Baro-thermo-hygrometer) { 38 sec
3. THGR918 (Outside temp. sensor) { 37 sec
4. WGR918 (Anemometer) { 14 sec
5. THGR228/238 (Channel 3) { 43 sec; Channel 2 { 41 sec; Channel 1 { 39 sec
18. What frequency range does the Weather Station have?
433 MHz
19. What is the difference between WMR918 and WMR968 models?
WMR968 has updated software that improves a reception performance
WMR968 barometric pressure sensor is able to register pressure on the elevation up to 12,000 feet above the sea level. The model WMR918 barometer works only for up to 6200 feet above the sea level.
20. What is the temperature accuracy for the WMR968?
+ Or { 2 degrees F
21. What is relative humidity?
Relative humidity takes in to consideration the ACTUAL amount of water vapor in the air compared to the amount of water vapor the air could hold for that particular temperature and pressure.
21. Why my display shows LL.L for outside dew point?
Dew point will show LL.L when outside temperature is below 32F or humidity lower than 2%
22. Why my display shows HH.H for outside dew point?
Dew point will show HH.H when an outside temperature is higher than 133F or outside humidity is higher than 98%.
23. I live at a higher altitude than the BA928 says it will adjust to. What do I do?
Their is an error in the owners manual for this product. Contrary to the manual, the unit is calculated in Meters and not feet. Convert your altitude to meters and program that number into the unit.
24. Why my display shows HH.H on a rainfall mode?
There are some possible reasons for these readings:
1. The real rain is higher that 393.7 in (higher than operating range)
2. A wrong number of the water buckets impulses due to wind influence on the bucket or the gauge support vibration.
Bucket impulses counter does not reset after each transmition.
25. How the rain gauge works
The rain gauge circuit board counts the buckets tip-over and then software calculates in/h rainfall. It requires a second tip to accomplish this calculation.
26. What kind of cable should I use for PC connection?
You should use a standard 9-pin serial cable. Do not use a NULL modem cable.
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