W
IRELESS
W
ATER
S
ENSOR
C
OPYRIGHT
©
2018,
R
ADIO
B
RIDGE
I
NC
.
W
IRELESS
W
ATER
S
ENSOR
P
AGE
4
OF
10
3.
T
ECHNICAL
S
PECIFICATIONS
3.1.
Absolute Maximum Ratings
Table 4 Absolute Maximum Ratings
Parameter
Rating
Units
Operating ambient temperature
-30 to +70
°C
Storage ambient temperature
-40 to +100
°C
4.
B
ATTERY
L
IFE
The sensor uses a lithium non-rechargeable battery and is capable of 20,000 to 1,000,000+ total
messages depending on the wireless standard and usage. For an accurate estimate of battery life,
please refer to the “Sensor Battery Estimator.xlsx” spreadsheet on the Radio Bridge website. This
spreadsheet combines usage information such as average number of messages per day and
estimates the battery life for a particular sensor.
The power required for a message transmission is much greater than the “sleep current” (the
power consumed when the sensor is inactive) for high power radio technologies such as Sigfox
and LoRaWAN. This means that the battery life for most sensors is primarily dependent on the
number of transmissions per day.
Different battery types will deplete over time with different voltage profiles. For instance, a
lithium battery will maintain a relatively high voltage for the life of the battery and then
experience a rapid drop near the end, whereas an alkaline battery will experience a more gradual
reduction in voltage over time. Radio Bridge sensors are shipped with lithium batteries, and these
are recommended when the battery needs to be eventually replaced.
Refer to the spreadsheet “Sensor Battery Estimator.xlsx” on the Radio Bridge
website for specific battery life estimates.
