How To Make Battery Calculations; Chart Longevity; Battery Life Expectancy1 - Teledyne 4220 Installation And Operation Manual

4220 Flow Meter
Section 1 Introduction
Table 1-3 Technical Specifications for the 3222 Submerged Probe (Continued)
Compensated Temperature Range 32° to 122°F (0° to 50° C).
Temperature Error (over compen-
sated temperature range)
Chart Speed, Inches/Hour
4
2
1
0.5
Note: Times assume Report Generator is turned off.
Flow Meter Settings Minimum
Reading Interval 5 Minutes
Printer Off
Report Generator Off
Average Current 14 mA
3
Nickel-Cadmium 10.7 Days
4
Lead-Acid 17.4 Days
Notes:
1. These figures are approximations based on calculations; actual times for your flow meter may vary due to
factors of battery age, charge condition, operating temperatures, and component differences. "Minimum" set-
tings 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.
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 holding down the 1 and Clear Entry keys at the same time.
3. The nickel-cadmium battery has a capacity of 4.0 ampere-hours at 20° C.
4. The lead-acid battery has a capacity of 6.5 ampere-hours at 20° C.
Both batteries are assumed to be fully charged with at least 95% of rated capacity and in good condition. These cal-
culations 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, rather than up.
1.7 How to Make Battery
Calculations
1-10
0.1 to 4.0 ft. (0.03 to 1.2 m) ±0.005 ft. per degree F
4.0 to 10.0 ft. (1.2 to 3.1 m) ±0.007 ft. per degree F
Table 1-4 Chart Longevity
Table 1-5 Battery Life Expectancy
Default
Continuous
Off
Off
9 mA
5
16.6 Days
27 Days
To calculate battery life expectancy for an installation, you must
know two things:
• The capacity of the battery you are using
• The average current draw of the flow meter or (other
device) powered.
Time to Empty Roll
1
/
195 Hours (8 Days)
2
1
/
16 Days
4
1
/
32 Days
2
65 Days
1
2
Maximum
Continuous
4" per Hour
Every Hour
23 mA
6.5 Days
10.5 days