Siemens SITRANS F MAG 8000 Standard Operating Instructions Manual page 72

Operation
7.6 Battery-powered operation
Leakage detection (advanced version only) will affect battery operation time if a higher
excitation frequency is selected during leakage period.
The effect of other temperatures is shown in the figure below.
A variation in temperature from 15 °C to 55 °C (59 °F to 131 °F) reduces the capacity by 17%
(in the table from 15 Ah to 12½ Ah).
Figure 7-15
Note
Installation orientation of battery pack may influence battery capacity. Optimal battery capacity
is achieved with battery pack in an upright position.
MAG 8000 Irrigation (7ME6880)
Excitation frequency
(24 hours operation)
1 D-Cell battery DN 25 to 600
(1" to 24")
DN 700 to
1200
(28" to 48")
Two D-Cell bat‐ DN 25 to 600
tery 33 Ah (1" to 24")
Internal battery
DN 700 to
pack
1200
(28" to 48")
Four D-Cell bat‐ DN 25 to 600
tery 66 Ah (1" to 24")
External battery
DN 700 to
pack
1200
(28" to 48")
Typical operation time of 6 years is based on only 80% battery capacity and an operation time/
temperature profile of 5% at 0 °C (32 °F), 80% at 15 °C (59 °F) and 15% at 50 °C (122 °F),
and no use of add-on communication module.
72
Available capacity
1/60 1/30
Hz Hz
52 months 40 months
36 months 24 months
105 months 80 months
72 months 48 months
200 months 160 months
120 months 96 months
1/15 1/5
Hz Hz
25 months 12 months
12 months 6 months
50 months 24 months
24 months 12 months
100 months 48 months
48 months 24 months
Operating Instructions, 11/2018, A5E03071515-AE
1.5625 Hz 3.125
Hz
2 months 1 month
1 month N/A
4 months 2 months
2 months N/A
8 months 4 months
4 months N/A
SITRANS MAG 8000