Calculation example 3 – Xylem CHATTER Hardware Manual User Manual
Page 41

Calculation Example 3
Chatter basic consumption per day (fixed) =
1.0
No. of logs per day @sensor consump.=2mA
24 x
0.1 = 2.4
No. of logs per day @sensor consump. =4mA
-
x
0.2 =
-
No. of event logs per day @sensor consump.=2mA 180 x
0.1 = 18.0
No. of event logs per day @sensor consump. =4mA -
x
0.2 =
-
No. of calls per day
2
x
3 = 6.0
No. of alarm calls per day
-
x
3 =
-
Consumption per day (total):
27.4
Battery lifetime in days:
15000/consump. per day [day] =
547.0
Battery lifetime in months:
Battery lifetime [days]/30 [months] =
18.2
Battery lifetime in years:
Battery lifetime [months]/12 [years] = 1.5 yrs
=======
Appendix B. Calculation of Battery Lifetime
Data Logger
41
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