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10 | P a g e
Internal PCB - Internal electronics circuit (The pressure sensor chip is
mounted within this PCBA, and it senses the tire pressure
against a built-in vacuum, resulting in an Absolute
Pressure reading. The internal firmware will then subtract
the sea-level pressure of 101.3 Kpa (14.7 psi) from this
reading. This final reading which will be shown in the
app can be termed as i) Tire Absolute Pressure minus
sea level pressure, or ii) Gage Pressure reference to sea-
level altitude. With this formulation, Fobo tire sensor will
read the same pressure value for any given tire,
irrespective of altitude (assuming a constant temperature).
This will ensure the correct tire footprint per vehicle
manufacturer‟s pressure recommendation, for all altitude
above sea-level, given a constant temperature.
As a corollary, a tire with a Fobo reading of, say 40 psi at
an altitude of 5000ft, will read the same 40 psi when
driven to sea-level, given a constant temperature. In
reality, it will read higher due to the warmer temperature
at sea-level, and may need some air release if the
temperature difference is great. Tire pressure generally
will increase 1 psi (~7kPa) for every 10 deg F (5.6 deg C)
rise in temperature.
Fobo wishes to highlight the above formulation is for
usage at sea-level and above, and will not be accurate for
use otherwise. In practice, this should not be an issue as
the lowest area on earth will result in an insignificant
error of 0.3 psi (~2 Kpa).
For users who wish to retain „Gage Pressure Reading‟,
the Fobo Tire App has a Gage Pressure, adjusted to local
altitude using cell towers or individual phone barometer
if available. This Gage Pressure button can be accessed
from the App (Kindly refers to Section 5.11 of this user
manual).
FOBO Tire sensor units are designed to be robust and operate reliably 24x7 to
provide tire information around the clock. It is designed to be water proof (IP57)
and by our special use of custom engineering plastics, it will be able to withstand
road salts or other common automotive chemicals (petrol, engine oil, car wash
shampoo, etc.).
Our designers have designed the sensors to ensure that there is no air leakage as it
replaces the tire‟s original valve cap. There is no need to screw on the sensor
10


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