Phytoplankton Sampler*
The PPS is designed to collect in situ suspended particulate
matter in an aquatic environment. A dual multi-port valve directs
the water through 24, user replaceable 47 mm filters for
a time-series operation. The positive displacement pump is placed
downstream from the filters to prevent sample contamination. Both
the multi-port valve and the positive displacement pump are controlled
by an internal computer, and can be accessed by an external computer
via serial communications (RS-232).
The menu-driven software allows the user to enter the initial
flow rate, total volume, maximum pumping time, and minimum flow
rate. In order to prevent the sample from being crushed onto the
filter and to conserve the battery life, the software is designed
to decease the flow rate when back pressure on a filter increases.
The internal computer records the instantaneous flow rate and
total volume at a constant interval of time for each filter.
The PPS can be deployed as a component of either an in-line
mooring (standard), seafloor lander, or ship deployment.
*U.S. Patent #5,341,834, and Japan #248282
Three-year warranty on parts and labor
| Physical |
Height |
165 cm |
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Width |
43 cm |
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Height |
43 cm |
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Weight in air |
60 kg |
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Weight in water |
35 kg |
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Type of deployments |
In-line mooring, seafloor lander, or ship deployment |
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| Multi-port valve |
Number of ports |
Dual 25 port valves |
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Drive |
High torque stepping motor with gearhead |
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| Filters |
Holder material |
Polypropylene |
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Filter size |
47 mm diameter |
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Filter type |
GFF or any other membrane filters |
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| Pump |
Flow rate |
50-125 ml/min;optional 100-250 ml/min |
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Maximum volume |
10 liters/filter (<10 µg/liters water) |
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Total |
250 liters |
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Volume error |
Average ± 3% total volume |
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Drive |
Brushless DC motor |
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| Controller |
Housing material |
Aluminium, 6061-T6 hardcoat anodized |
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Main battery |
31.5 VDC alkaline battery pack |
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Current consumption |
9000 mAh (1 year deployment) |
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Communications |
Serial (RS-232); external computer |
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| Frame |
Material |
316 Stainless Steel, electro-polished |
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Structure |
In-line mooring, weldment |
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Bridle configuration |
4 in-line |
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Frame & bridle eyes |
19 mm diameter, insulated |
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| Operation Conditions |
Maximum depth |
5,500 m |
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Max. deployment length |
14 months |
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Operating temperature |
0 to 50°C, Electronics tested to -10°C |
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Specifications subject to change
