Change Of Batteries - BT CGA-411 Operation Manual

7.

CHANGE OF BATTERIES

Automatic Battery Check
The Gas-Sentry CGA-411 and CGA-412 can be powered by four (4) alkaline (non-
rechargeable) AA batteries (1.5V, Type AM-3) or by four (4) Ni/Cd rechargeable batteries
(1.25V, 0.85 Ah). If the estimated battery life is less than about 1 hour, the display flashes "Lo"
(low) between readings. The batteries should be changed at a convenient time. If the battery life
is over, the display stays on "Lo". The batteries must then be changed to make the instrument
operational.
WARNING: The batteries must be changed in an atmosphere known to be
non-hazardous.
To replace batteries:
1. Remove batteries
Snap open the bottom part of the carryall, partially
withdraw the instrument, and slide out the battery
cover by depressing latch with thumb while pressing
down on cover with fingers.
2. Discard four alkaline AA cells or remove four Ni/Cd cells.
Insert four, fresh AA alkaline batteries or recharged Ni/Cd batteries. Insert each battery
with the correct polarity as shown on rear of instrument. Replace battery cover and lock
into place. Always replace a set of batteries, do not mix new and used batteries.
If the instrument does not operate after battery replacement, or if the display is dim, there is
a high probability that one or more cells have been inserted with the wrong polarity. Re-insert
the batteries taking extra care to insert each battery correctly.
Note: The CO cell is powered by the four batteries in the unit even when the instrument is OFF.
The instrument should not be left without power for more than one minute during battery
replacement. If the instrument is without batteries for an extended period, the CO cell
will require about 10 minutes to return to a proper operating condition.
CAUTION: Always store the instrument with a full complement of batteries.
WARNING: Use only alkaline or Ni/Cd batteries in a Gas-Sentry. Do not attemp to
charge the alkaline (non-rechargeable) batteries as they may leak or vent.
15
Fig. 2.