16
SMARTIRE SYSTEMS INC.
UNDERSTANDING TEMPERATURE COMPENSATED
PRESSURE READINGS
An important feature of the SmarTire Full Function Display system is that pressure
deviation alerts are initiated from a comparison of the temperature compensated
pressure to the measured tire pressure read by the sensor.
The reference pressure, or “cold pressure” is the air pressure inside the tire inflated
at room temperature (64˚ F or 18˚ C) to the vehicle manufacturer’s recommendation.
When a tire heats up, the air pressure inside the tire can also be expected to increase.
For example, a normal or “required” pressure at 64˚ F or 18˚ C may be 34 PSI or
2.35 Bar and a normal pressure at 120˚ F or 49˚ C may be 39 PSI or 2.7 Bar. Both
pressure readings are correct at their respective temperatures.
The amount of deviation from the required pressure (at any temperature) can be
read by using the Pressure Deviation mode of this SmarTire product. If at any time
you are uncertain that the Actual Pressure reading on the display indicates the
correct tire pressure, switch to the Pressure Deviation (
+-
) readout. A blank display
indicates that the reading on the display is the correct one. Any (+) or (-) value
indicates the tire pressure is incorrect by that value. This value can then be used to
correctly inflate the tire.
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