Glacier Transportable Sampler - Isco

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Glacier Transportable Sampler Appendix D Battery Selection Guide Glacier is programmed for continuous sampling, V c would be the programmed bottle volume, provided that bottle-full detection is being used. Use Figure D-1 to find A c by determining the amp-hours for the average ambient temperature at your sampling site. Once the sample liquid has been cooled, more energy is required to keep it cool. The second group in the equation may be used to calculate the amp-hours required each day to keep the sample at 3° C. The number of days, D m , is the days from the first collected sample to when the Glacier is no longer expected to keep the sample cool. Use Figure D-2 to find A m . The following scenario illustrates how to use the equation. Consider a Glacier that is inhibited while waiting for an external device to indicate that a measured condition, such as a rain event, has occurred. The average ambient temperature is 30° C (86° F). When the external device clears the inhibit, the Glacier will collect sample volumes of 250 ml, once an hour, for 24 hours. After running the program, it will take another day to retrieve the Glacier and bring the composite sample to the lab. From this example, we know that V c is 6 liters, D m is two days (one to collect the samples, another to retrieve it), and the ambient temperature is 30° C. At this ambient temperature, Figure D-1 tells us A c is 25, and Figure D-2 tells us A m is 29. The equation would be: ( )( ) V c x A c + D m x A m = Expected power consumption, Amp-hours 6 6 x 25 + 2 x 29 = 83 Amp-hours ( 6 )( ) Using the equation we find operating the sampler under these conditions would need a fully-charged battery with a capacity of at least 83 amp-hours. As previously mentioned, standby current is negligible. In the example above, the Glacier could be waiting several days for the rain event. Because the refrigeration system is not activated until the first sample is taken, the number of days the Glacier is inhibited is generally of no concern. Figure D-1 assumes that the liquid temperature at the sampling point is at room temperature (68 to 77° F or 20 to 25° C). Increase or decrease the expected battery capacity accordingly if the actual liquid temperature falls outside of this temperature range. Other factors, such as high suction head heights (over 3 m or 10 feet) or the amount of direct sunlight will also affect the rated current demand on the battery. D-2
Glacier Transportable Sampler Appendix D Battery Selection Guide Ambient (˚C) 60 0 10 20 30 40 50 50 40 Sample Cooling Demand Amp-hours 30 20 10 0 32 47 62 77 92 107 Ambient (˚F) 122 Figure D-1 Amp-hours required to cool 6 liters of sample liquid from 20° C (A c ) Ambient (˚C) 60 0 10 20 30 40 50 Sample Maintenance Demand 50 Amp-hours per Day 40 30 20 10 0 32 47 62 77 92 107 122 Ambient (˚F) Figure D-2 Amp-hours per day required to maintain sample liquid at 3° C (A m ) D-3
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