Teledyne 3350 - Microprocessor based control room monitor for personnel safety - Manual (Page 21)

3-5
Alarm Oxygen Monitor Installation 3
Teledyne Analytical Instruments
Periodically test the condition of the battery pack by pressing the
“BATTERY TEST” pushbutton inside the instrument’s control panel and
note the battery condition by viewing the "battery low" LED on the front
panel. Release the pushbutton to return to the normal sampling mode. The
battery test provides only an indication of the battery state under the test
conditions; it is possible that a battery might test well but perform for only a
short time under actual operational conditions (a characteristic of the battery,
not the analyzer), so it is very important that power outages be corrected
without delay. Furthermore, TAI recommends that the instrument be tested
periodically by operating it for several hours without AC power (that is,
under battery power).
The optional battery backup version of the Model 3350 is designed to
operate on standby battery power for at least 17 hours in Fail Safe mode and
48 hours in Non-Fail Safe mode (if conditions are favorable, i.e., conditions
are not extreme and the battery is well charged and in good condition).
Under actual conditions, however, these factors will always tend to evolve
toward the worst case if left unattended. Therefore, the user must always
ensure that battery condition, charge and other related factors are monitored
with sufficient frequency to prevent problems. Most importantly, DO NOT
DEPEND UPON THE LONGEVITY OF BATTERY BACKUP, but
correct problems as soon as possible.
Battery service life depends on the number of discharge cycles, depth of
discharge and ambient temperature.
Cycle service life in relation to depth of discharge:
180 cycles at 100% discharge
450 cycles at 50% discharge
1200 cycles at 30% discharge
The battery is designed for use in standby operation for approximately 3-5
years under normal service conditions. An ideal service condition will be
realized when the battery is operated at an ambient temperature of 20
o C
(68 o F). Operation of the battery at higher temperatures will reduce the
battery life.
3.5.2.1 Connecting the Rechargeable Battery
Connect the battery as follows:
1. Slide "quick connect" lug attached to the black wire onto the
negative (-) lug of the battery located closest to the opening of the
enclosure.
Analog outputs should not be connected to any AC line
source, or any source of hazardous voltages.