Teledyne 4250, Installation And Operation Manual, Page: 24 / 204

4250 Flow Meter
Section 1 Introduction
1-12
Table 1-5 4250 Chart Longevity
Note
Report Generator is turned off.
Chart Speed, Inch/Hour Time to Empty Roll
4 7
1
/
4
Days
2 14
1
/
2
Days
1 29 Days
0.5 58 Days
Table 1-6 Battery Life Expectancy
Flow Meter Settings Minimum
Default
2
Maximum
Level Reading Interval 1 Minutes 5 Minutes Continuous
Velocity Reading Interval 5 Minutes 30 Minutes Continuous
Printer Off Off 4" per Hour
Report Generator Off Off Every Hour
Average Current 14 mA 11 mA 70 mA
Nickel-Cadmium
3
10.7 Days
5
13.6 Days 2.1 Days
Lead-Acid
4
17.4 Days 22.1 Days 3.4 Days
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.