VAT 642 Series Installation, Operating, & Maintenance Instructions page 78

7.2.2.1 Durability of power fail battery
The curves in the graph show the estimated life of Ultra Cap PFO in the worst condition (max. sensor
load = 1 A, valve heating temperature = 150 °C).
If the SPS is not fully loaded (< 1 A) or heating temperature of valve body is lower than 150 °C, the
corresponding life time curve will be somewhere in between the upper and the lower curve.
Therefore please determine the equivalent maintenance period for replacing the Ultra Cap battery
(Option board).
120
100
80
60
40
20
0
20
78/94
MAINTENANCE
25 30
Ambient temperature [°C]
This graph shows estimated life of Ultra Cap PFO for reference and not as
guaranteed value.
Edition 2017-11-24
35 40
Series 642
w/o SPS module,
valve unheated
with SPS module,
valve unheated
w/o SPS module,
valve heated
with SPS module,
valve heated
45 50
605403ED