Setra System Model 370 - Manual (Page 41)

IV.1 BATTERY / RECHARGER OPTION
The Model 370 Digital Pressure Gauge can be operated as a portable
instrument with the battery/recharger option. The battery option is
designed to allow a standard 8 hour workshift, followed by a 16 hour
recharge cycle.
The battery option is a rechargeable 12 VDC Nicad battery, and an
automatic internal battery charger which functions whenever the gauge is
plugged into an AC outlet. Also included in the battery option are an on/off
switch and the required internal wiring.
OPERATION
The battery is shipped from the factory in a low charge condition. Before
use, plug the gauge into AC power for 16-24 hours to allow a complete
charge of the battery to take place.
The high capacity Nicad batteries are rated for more than 1,000 charge/dis
charge cycles. As with any Nicad, the life and performance of the battery pack
can be extended by following the suggested usage guidelines, that is, allow the
battery to run and discharge for 8 continuous hours before recharging it for a
minimum of 16 hours.
The battery is automatically trickle charged whenever AC power is present.
There is no danger of overcharging the battery so no other precautions
are necessary.
Setra also offers replacement or spare battery packs and an external recharger
for applications where battery operation is desired for longer than 8 hours. A
battery pack may be externally charged and then placed in the gauge.
REPLACING THE BATTERY PACK
1. Disconnect the AC power cord.
2. Place the gauge face down on a clean flat surface.
3. Remove the 3 screws which hold the back cover in place and remove
the cover.
4. Do not remove any other screws, opening the sensor cavity will
affect calibration.
5. The battery is the block with the yellow plastic cover. Unplug its' cord
from the receptacle in the housing.
6. Remove the battery by lifting up and back (the battery is "L" shaped).
7. Replace the new battery by reversing the above steps.
Appendix IV
ACCESSORIES AND OPTIONS
35