F-1
BLZZRD
Portable Refrigerated Sampler
Appendix F Battery Selection Guide
F.1 Introduction
This section provides information to assist with selecting a power
source for a 12 Vdc battery-powered BLZZRD sampler. Teledyne
ISCO recommends deep-cycle marine batteries, although any 12
Vdc power source will work provided that it can meet the current
demands of the refrigeration system.
F.2 Determining the
Power Consumption
The sampler requires continuous 12 Vdc power for several pur-
poses:
•
an idle current while the sampler is inhibited, waiting
for the next sample, or after it has finished its sampling
program
•
logging temperature readings at one-minute intervals
•
operating the pump
•
cooling the samples.
The first three are negligible when compared to the energy
required to cool the liquid as it is collected and to maintain the
samples at 3 °C.
The amount of energy required to cool the samples correlates to
ambient air temperature. The higher the air temperature, the
more the sampler must operate the refrigeration system.
The equation below may be used as a guide for selecting a
battery that will meet the requirements of your sampling
program.
Before using the equation you must know:
•
the total sample volume that will be collected
•
the number of days that the sampler must keep the
sample cooled to 3 °C
•
and the average ambient temperature.
The first group in the equation calculates the amp-hours
required to cool the sample liquid as it is collected. The total
sample volume, V
c
, can be determined by the programmed
number of samples multiplied by the sample volume. If the
sampler is programmed for continuous sampling, V
c
would be the
V
c
x A
c
Where:
V
c
= Total sample volume to cool, in liters
A
c
= Amp-hours to cool sample liquid from 20 °C
D
m
= Number of days sample volume must be maintained
A
m
= Amp-hour per day factor for maintenance
+ D
m
x A
m
= Expected power consumption, Amp-hours
6
(
) (
)
(Fig F-1)
(Fig F-2)
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Страница 219: ...BLZZRD Portable Refrigerated Sampler Appendix B Material Safety Data Sheets B 8 ...
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