DLR-TL001 Functional Description
8
DLR-TL001
sample. The MKT function can be enabled/disabled. The
following formula gives the MKT:
Where ΔH is the MKT activation energy constant
expressed in J/mol, R is the universal gas constant, n is
the number of the samples and Tn is the temperature of
the different samples expressed in °K.
The user can set a threshold value for the MKT; if the MKT
exceeds the threshold, DLR-TL001 Tag generates an alarm
setting MKT_ALARM bit to 1 in the STATUS register.
Remaining Shelf Life Calculation
Shelf Life is the length of time that perishable items are
given before they are considered unsuitable for sale or
consumption. As well as the MKT, the remaining Shelf Life
calculation is useful to monitor the status of the protected
goods during the shipment. The DLR-TL001 calculates the
remaining Shelf Life at each sampling time. Shelf Life time
can be enabled/disabled.
The remaining Shelf Life (hours) is calculated with a for-
mula that is described in the Product Reference Guide or
in the Programming Manual, in the “Shelf Life” dedicated
chapter.
Battery Measurement and Behaviour
The DLR-TL001 tag includes a battery measurement cir-
cuitry that allows to control the battery charge level.
Four battery charge levels are defined: Full (3), Normal (2),
Low (1), Empty (0); values can be obtained by reading two
dedicated BITs in the STATUS register. The DLR-TL001 tag
behaves normally when the battery is at the Full or Nor-
mal battery level, while it is automatically put in Sleep
state when the level reaches the Low value.
When the battery level status is Low (1) or Empty (0) the
battery level is considered critical, so the condition is
reported by the manual interface as described in the rele-
vant paragraph.
n
e
e
e
R
H
MKT
n
RT
H
RT
H
RT
H
...
ln
2
1
