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Global Water
Appendix B: Battery Life
While battery life depends on several factors such as charge, condition and temperature; it
can generally be assumed that the sampler can deployed in the field for 6 months waiting to
be triggered, while still retaining enough charge to run a single pump for one hour (about 10
gallons) or both pumps for ½ hour (5 gallons). To prevent large current surges which occur
when the pumps first turn on, the WS755 is designed so that only one pump will turn on or
off at a time. A ½ second time delay is inserted between these events, extending the life of
the charge and the life of the battery.
The battery should be monitored periodically for voltage; the low self-discharge design will
allow minimal maintenance during periods of non-use.
Appendix C: Input and Output Connections
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