ADS Environmental Services Model 4000 530017 A0 - Manual (Page 89)

Maintenance and Troubleshooting 5-3
Confirming the Monitor
Confirm the accuracy of the sensor subsystems in the monitor on a
regular basis. Confirmation involves comparing manually-
measured depth of flow and velocity readings to the monitor's
readings. This process also verifies sensor calibrations. Refer to
the FieldScan User's Guide (#950021**) for detailed information
on confirmation procedures.
Opening the Monitor Enclosure
Removing the monitor chassis during battery or board swaps
increases the risk of damaging internal components or introducing
debris or moisture to the monitor electronics. Make every effort to
prevent water, dirt, and debris from contacting the monitor's
internal components during routine maintenance or part
replacement.
The chassis includes a special Velcro  strap for securing the
chassis cables within the enclosure to prevent damage or pinching
between the monitor top and enclosure. Inspect the strap whenever
you open the monitor to replace the batteries, and always replace
this strap following board swaps.
Replacing the Battery Pack
Check the battery voltage using FieldScan before installing the
monitor and after collecting data. The projected life for the battery
pack is 365 days at a 15-minute sample rate. However, replace the
battery pack as soon as possible whenever the voltage reads below
8.0 volts or FieldScan or Profile provides a Low battery status.
Warning: A dead battery will prevent communication
with and data collection from the monitor.
Refer to the FieldScan User's Guide (#950021**) for instructions
on requesting the battery voltage and status.
Replace the battery pack in the following way:
1. Collect data from the monitor.