Term
Hygrometer
Inches of Mercury (inHg)
Range
Relative Barometric
Pressure
Resolution
Thermometer
6. Specifications
6.1 Wireless Specifications
Line of sight wireless transmission (in open air): 300 feet, 100 feet under most conditions
Update Rate: about one minute
Frequency: 915 MHz
6.2 Measurement Specifications
The following table provides the specifications for the measured parameters.
Measurement
Indoor Temperature
Outdoor Temperature
Indoor Humidity
Outdoor Humidity
Barometric Pressure
6.3 Power Consumption
ObserverIP Receiver : 5V DC Adaptor (included)
Indoor Thermo-hygrometer-barometer sensor : 2xAA batteries (not included)
Outdoor Thermo-hygrometer sensor: 2xAA batteries (not included)
Version 1.0
©Copyright 2015, Ambient LLC. All Rights Reserved.
as millibars (1 hPa = 1 mbar)
A hygrometer is a device that measures relative humidity. Relative
humidity is a term used to describe the amount or percentage of water
vapor that exists in air.
Pressure in Imperial units of measure.
1 inch of mercury = 33.86 millibars
Range is defined as the amount or extent a value can be measured.
Measured barometric pressure relative to your location or ambient
conditions.
Resolution is defined as the number of significant digits (decimal
places) to which a value is being reliably measured.
A thermometer is a device that measures temperature. Most digital
thermometers are resistive thermal devices (RTD). RTDs predict change
in temperature as a function of electrical resistance.
Range
32 to 140 °F
-40 to 149 °F Lithium
batteries
-23 to 140 °F Alkaline
batteries
1 to 99%
1 to 99%
8.85 to 32.50 inHg
Definition
Accuracy
± 2 °F
± 2 °F
± 5%
± 5%
± 0.08 inHg (within range of
27.13 to 32.50 inHg)
Resolution
0.1 °F
0.1 °F
1 %
1 %
0.01 inHg
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