Dynasonics 902_903 Series Portable Doppler Ultrasonic Flow Meter - Manual (Page 20)

Rev. 10/08
- 18 - D902/3
The D902/3 flow meter is equipped with a Lead Acid Gel
Cell battery. This battery will require charging before initial
operation. Apply AC power, utilizing the enclosed line
power cord, to the D902/3 for a period of 16-24 hours prior
to using the product for the first time. The line cord
connects to the socket connection located on the side of
the enclosure.
The D902/3’s integral battery provides continuous
operation for up to 8 hours on a full-charge. The battery is
“maintenance free”, but it still requires a certain amount of
attention to prolong its useful life. To obtain the greatest
capacity and longevity from the battery, the following
practices are recommended:
• Do not allow the battery to completely discharge.
(Discharging the battery to the point where the LOW
BATTERY indicator illuminates will not damage the
battery. Allowing the battery to stay discharged for long
periods of time can degrade the storage capacity of the
battery.) When not in use, continually charge the
battery by keeping it plugged into line power. The
D902/3 battery management circuitry will not allow the
battery to become “over-charged”.
NOTE: The D902/3 will automatically enter a low power
consumption mode approximately 1-1/2 minutes after the
LOW BATTERY indicator illuminates. This circuit prevents
excessive discharge of the internal battery.
• If the D902/3 is stored for prolonged periods of time,
monthly charging is recommended.
• If the D902/3 is stored for prolonged periods of time,
store at a temperature below 70 ºF (21 ºC).
The CHARGING indicator will always be illuminated when
the D902/3 is connected to line power and the flow meter
is turned ON. If the D902/3 is turned OFF and line power
is connected, the CHARGING indicator will illuminate only
when the internal circuit is charging the battery. During
storage, the CHARGING indicator will cycle as necessary.
PART 2 - SERVICE AND MAINTENANCE
Battery Care and
Maintenance