Battery Compartment Desiccant; Estimating The Battery Life - Hach 911 User Manual

Meter Installation

4.3.3 Battery Compartment Desiccant

1 Desiccant
1 Desiccant

4.3.4 Estimating the Battery Life

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The battery compartment in both the 911 and 940 Flow Meters is kept dry with a small
desiccant cartridge to avoid moisture damage to the batteries and power circuitry
(Figure 17 and Figure 18).
When the beads are blue they can remove moisture from the enclosure. When they turn
pink, they cannot absorb any more
moisture. When the blue desiccant turns pink, replace the desiccant.
Figure 17 911 Case, Battery End with Inserted Desiccant
Figure 18 940 Case, Battery End with Inserted Desiccant
When using the battery pack, battery life is based on:
• Number of sensors installed (more sensors decrease battery life).
• Recording intervals (longer intervals increase battery life).
• Temperature (colder temperatures decrease battery life).
• Site hydraulics (second order effect caused by excessive turbulence).
• Interval between downloads.
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