An intelligent degree-day sensor that can
be customized to your application.
The LifeTrack eTTI
(electronic time-temperature integrator) tag is a new type of low-cost degree-day monitor. Programmed with your application's precise time-temperature sensitivity curve, it can
monitor degree-day statistics for time intervals ranging from days to years, constantly monitoring the impact of temperature and time,
and generating a running total of the accumulative impact of time and
The LifeTrack computes the integral of time and a user programmed
degree-day temperature function, and can also test if the function has
exceeded a predetermined cutoff value.
Example of a LifeTrack display showing if a
preset degree-day criteria has been met yet or not (here the criteria
have not been met yet, and the process is only about 25% complete).
Each LifeTrack unit is
flash-programmed with the precise details of your application's temperature sensitivity.
The LifeTrack unit can be programmed with even complex degree-day criteria,
such as upper and lower development thresholds, horizontal, intermediate and
vertical cutoff methods, and other parameters. The unit is so low cost
that many LifeTrack units can be used to give a comprehensive set of
degree-day statistics throughout a large area.
and temperature statistics:
The LifeTrack unit outputs
degree-day statistics, and other temperature history data, through its onboard infrared
serial port. This port, which sends data to the RS232 interface of
essentially any computer through a low-cost download cable, provides
flexibility and easy manipulation of the output data. Each unit also has unique security codes and
individual serial numbers to help guard against tampering or misuse. A 60x speed "QC test mode" enables the unit to
be rapidly validated.
What can it monitor? With a
standard battery life of up to three years, the LifeTrack can monitor
degree-day statistics for any system operating from -20 oC to 70
oC, and from 1 day to three years, including:
Cutoff temperature sensitivity
Heating and cooling
Linear temperature sensitivity
Nonlinear temperature sensitivity
Threshold temperature sensitivity
and nearly any other
system where time-temperature history is critical.