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MAG 8000 & MAG 8000 CT
36
SFIDK.PS.026.D9.02
5. Operation
5.4.2 Battery operation
time and calculation
The battery operation time depends on the connected battery pack as well as the operation
conditions of the meter. Every 4 hours the advanced power management system calculates the
real power consumption and remaining operation capacity.
The power consumption calculation includes flow measurement, meter dialog (communication
and display) and pulse output.
The temperature is also measured to control and adjust its influence on the battery capacity.
The internal battery pack has a nominal capacity of 33 Ah giving a typical operation time of 6 years
in a revenue application. The nominal capacity of external battery packs is 66 Ah and the
operation time is limited to the lifetime of the batteries - typically 10 years. Configuration and
operation conditions
for a typical revenue application is shown in the table.
The typical operation time of 6 years is based on only 80% battery capacity and an operation time/
temperature profile of 5% @ 0 °C/32 °F, 80% @ 15 °C/59 °F and 15% @ 50 °C/122 °F.
The leakage detection, in the advance version, will affect the battery operation time if a higher
excitation frequency is selected during leakage period.
The effect from other temperatures can be seen from the figure.
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).
Note
Physical installation of the battery pack may
influence the battery capacity. Optimal battery
capacity is achieved with the battery pack in
an upright position.
Excitation frequency
(24 hours operation)
1/30 Hz
1/15 Hz
1/5 Hz
1.5625 Hz
3.125 Hz
6.25 Hz
Two D-Cell battery
DN 25...200
8 year
6 year
40
8 months
4 months
2 months
33 Ah Internal
(1"...8")
months
battery pack
DN 250…600
6 year
4 year
20
4 months
2 months
NA
(10"...24")
months
Four D-Cell battery DN 25...200
10 year
10 year
80
16 months
8 months
4 months
66 Ah External
(1"...8")
months
battery pack
DN 250…600
10 year 8 year
40
8 months
4 months
NA
(10"..24")
months
Scenario - Revenue application
Output A
Pulse - 10 Hz
Output B
Alarm or Call up
Meter dialog
1 hour per month
Excitation frequency
1/15 Hz
Country main frequency
50 Hz / 60 Hz
Содержание SITRANS F M MAG 8000
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