User manual
Version 1.5 ©Copyright 2010, Ambient LLC. All Rights Reserved. Page 33
1 inch of mercury = 33.86 millibars
Radio Controlled Clock
(RCC)
The United States government distributes time-of-day to the public
using radio broadcasts. The low frequency (LF) station WWVB is
located in Fort Collins, Colorado and broadcasts on 60 kHz. The high
frequency (HF) stations WWV and WWVH are located in Colorado and
Hawaii respectively, and broadcast on five different frequencies ranging
from 2.5 to 20 MHz. At least one HF signal should always be usable at
any given time anywhere in the United States.
Range
Range is defined as the amount or extent a value can be measured.
Relative Barometric
Pressure
Measured barometric pressure relative to your location or ambient
conditions.
Resolution
Resolution is defined as the number of significant digits (decimal
places) to which a value is being reliably measured.
Wind Vane
A wind vane is a device that measures the direction of the wind. The
wind vane is usually combined with the anemometer. Wind direction is
the direction from which the wind is blowing.
8. Specifications
8.1 Wireless Specifications
Line of sight wireless transmission (in open air): 300 feet
Update Rate: 48 seconds
Frequency: 433 MHz
8.2 Measurement Specifications
The following table provides the specifications for the measured parameters.
Measurement
Range
Accuracy
Resolution
Indoor Temperature
32 to 140 °F
± 2 °F
0.1 °F
Outdoor Temperature
-40 to 149 °F
± 2 °F
0.1 °F
Indoor Humidity
10 to 99%
± 5%
1 %
Outdoor Humidity
10 to 99%
± 5%
1 %
Barometric Pressure
8.85 to 32.50 inHg
± 0.08 inHg (within
range of 27.13 to 32.50
inHg)
0.01 inHg
Rain
0 to 394 in.
± 10%
0.01 in
Wind Direction
0 - 360 º
22.5º (16 point
compass)
22.5º (16 point
compass)
Wind Speed
0 to 112 mph
± 2.2 mph or 10%
(whichever is greater)
0.1 mph
8.3 Power Consumption
Base station : 3XAA 1.5V LR6 Alkaline batteries
Remote sensor : 2xAA 1.5V LR6 Alkaline batteries
Battery life: Minimum 12 months for base station
Minimum 24 months for thermo-hygro sensor (use lithium batteries in cold weather climates)