Battery Life Expectancy - Teledyne 4250 Installation And Operation Manual

4250 Flow Meter
Section 1 Introduction
1-12
Note
Report Generator is turned off.
Chart Speed, Inch/Hour
Table 1-6 Battery Life Expectancy
Flow Meter Settings
Level Reading Interval
Velocity Reading Interval
Printer
Report Generator
Average Current
3
Nickel-Cadmium
4
Lead-Acid
1. These values are approximations based on calculations; actual
times for your flow meter may vary substantially due to factors
of battery age, charge condition, operating temperatures, and
component differences.
"Minimum" settings are those providing the lowest average current
draw. "Maximum" settings are those requiring the highest current
draw. Your program should draw somewhere between the two. It is not
possible to calculate the current draw for every possible program com-
bination.
2. The default settings are the program entered at the factory. You can
reset the flow meter to the default program at any time by pressing the
1 and CLEAR ENTRY keys at the same time.
3. The nickel-cadmium battery has a capacity of 4.0 ampere-hours at
room temperature (20°C).
4. The lead-acid battery has a capacity of 6.5 ampere-hours at room tem-
perature (20°C). Both batteries are assumed to be fully-charged with
at least 95% of rated capacity and in good condition. These calcula-
tions also assume a 5% safety factor at the end of discharge.
Lead-acid batteries should never be completely discharged.
5. All fractional times are rounded down.
Table 1-5 4250 Chart Longevity
4
2
1
0.5
Minimum
Default
1 Minutes 5 Minutes
5 Minutes 30 Minutes
Off Off
Off Off
14 mA 11 mA
5
10.7 Days 13.6 Days
17.4 Days 22.1 Days
Time to Empty Roll
1
/
7 Days
4
1
/
14 Days
2
29 Days
58 Days
2
Maximum
Continuous
Continuous
4" per Hour
Every Hour
70 mA
2.1 Days
3.4 Days