Siemens SITRANS F M MAG 8000, Руководство по эксплуатации, Страница: 72 / 164

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).
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Figure 7-15 Available capacity
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) 1/60
Hz
1/30
Hz
1/15
Hz
1/5
Hz
1.5625 Hz 3.125
Hz
1 D-Cell battery DN 25 to 600
(1" to 24")
52 months 40 months 25 months 12 months 2 months 1 month
DN 700 to
1200
(28" to 48")
36 months 24 months 12 months 6 months 1 month N/A
Two D-Cell bat‐
tery 33 Ah
Internal battery
pack
DN 25 to 600
(1" to 24")
105 months 80 months 50 months 24 months 4 months 2 months
DN 700 to
1200
(28" to 48")
72 months 48 months 24 months 12 months 2 months N/A
Four D-Cell bat‐
tery 66 Ah
External battery
pack
DN 25 to 600
(1" to 24")
200 months 160 months 100 months 48 months 8 months 4 months
DN 700 to
1200
(28" to 48")
120 months 96 months 48 months 24 months 4 months N/A
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.
Operation
7.6 Battery-powered operation
SITRANS MAG 8000
72
Operating Instructions, 11/2018, A5E03071515-AE