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The dew point is the temperature the air needs to be cooled to (at constant
pressure) in order to achieve a relative humidity (RH) of 100%. At this point, the
air cannot hold more water in the gas form. Dew Point is automatically calculated
by a math formula that uses readings from temperature and relative humidity
sensors.
3.3
BAROMETRIC PRESSURE
The pressure sensor is an absolute barometric pressure sensor with extremely
high accuracy and resolution and low noise. The sensor provides full accuracy
from 300 to 1100 hPa. Each reading is taken every 15 seconds to minimize internal
sensor heat-up and reduce power consumption.
Uranus firmware is able to calculate and display relative barometric (sea level)
pressure and barometric altitude.
LIGHT / SKY BRIGHTNESS
3.4
The light sensor has a very-high sensitivity light-to-digital converter that transforms
light intensity into a digital signal output. The sensor combines one broadband
photodiode (visible plus infrared) and one infrared-responding photodiode on a
single CMOS integrated circuit. By subtracting infrared from broadband light, the
sensor can precisely calculate visible light. This is the reason why it does not
require an IR-Cut glass. Moreover, sensor comes into a UV-rejection package.
The light sensor has a very high dynamic range of 600M:1 able to measure from
direct sunlight to very dark skies (practically up to 22.0 mag/arcsec
sensitivity is down to 188 μlux.
Light sensor provides data to the microcontroller of Uranus where illuminance
(ambient light level) in lux is derived using an empirical formula to approximate the
human eye response. Lux readings are converted to Magnitudes per square
arcsecond, abbreviated as MPSAS. In addition, Uranus calculates the NELM
(Naked Eye Limit
Uranus Meteo Sensor
Magnitude) and
Bortle Scale.
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Pegasus Astro - Uranus Meteo Sensor Manual
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). Its highest
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