Smart Sampling at its best
with the improved MultiNet generation of the Multiple Plankton Sampler, the world’s leading sampling system for horizontal, oblique, and vertical collections in successive water layers. The MultiNet “Maxi” (0.5 m²) has 9 net bags attached to the stainless steel frame with strong canvas parts by means of zip fasteners.
The net bags are opened and closed by means of levers that are triggered by a battery-powered Motor Unit. The commands for actuation of the net bags are given via single or multi-conductor cable between the Underwater Unit and the included Deck Command Unit. The commands for actuation of the net bags are given via single or multi-conductor cable between the Underwater Unit and the included Deck Command Unit. A wide selection of mesh sizes for the net bags is available to meet the requirements of all standard and non-standard applications. For common horizontal collections, a mesh size of 300 microns is recommended (mesh sizes from 100 to 780 microns are available), for vertical collections mesh sizes from 55 to 780 microns are applicable. For mesh sizes below 100 microns, it is recommended to use an enhanced net bag (for example a double-layered net bag: one with 55 microns plus one with 300 microns).
An integrated Pressure Sensor (measuring range according to customers’ requirements) allows continuous supervision of the current operating depth. Depth values and all relevant system data are shown on the LCD display of the Deck Command Unit. Two Electronic Flow Meters with automatic angle compensation are mounted to the Underwater Unit: one inside the frame for the determination of the amount of water passing through the open nets, and one outside the opening for the determination of clogging effects.
For horizontal collections, a V-Fin Depth Depressor is attached to the MultiNet. To carry out vertical collections, stainless steel support is securely attached to the net buckets and enables a quick lowering to depth.
In case a conducting cable is not available on board, the required sampling depth can be pre-programmed via a personal computer. The activation of the net bags is then carried out automatically according to the pre-selected depth intervals. All measured data are stored inside the internal data memory of 16 MByte during the operation and can be read out by a PC when the MultiNet is back on board.
In case a conducting cable is not available on board, the required sampling depth can be pre-programmed via a personal computer. The activation of the net bags is then carried out automatically according to the pre-selected depth intervals. All measured data are stored inside the internal data memory of 16 MByte during the operation and can be read out by a PC when the MultiNet is back on board.
Together with the optional CT-Set the system offers the full capability of a state-of-the-art oceanographic CTD probe. The CT-Set consists of one conductivity sensor, one temperature sensor, and an additional electronics board which is completely integrated into the Motor Unit of the MultiNet. From the CTD data, the system computes salinity, density, and sound velocity according to UNESCO formulas.
The optional Pitch and Roll Sensor has been developed for measurements of the pitch angle and roll angle of the Underwater Unit of the MultiNet. It allows continuous supervision of the current orientation during horizontal operations.
– Additional sensors of various parameters
– Special version for operational depths down to 6000 metres
Length |
110 cm |
Width |
120 cm |
Height |
135 cm |
Net opening |
71 cm x 71 cm = 0.5 m² |
Net bags |
9 pcs., length: 365 cm |
Standard mesh size |
300 µm |
Plastic net buckets |
9 pcs., 11 cm dia. |
Soft net buckets |
9 pcs., 11 cm dia. |
Overall length ready for operation
|
800 cm |
Weight on air |
approx. 260 kg |
Weight for stainless steel support |
approx. 70 kg |
Weight of V-Fi depressor |
approx. 70 kg |
Material of frame |
Stainless Steel |
Material of motor unit and
|
Titanium |
Material of net bag |
MOnyl |
Material of net buckets |
PVC/Canvas |
Material of V-fin depth
|
Aluminium, lead-weighted |
Operational depth |
Standard 3000m – optional 6000m |
Pressure sensor |
Standard 3000.0 dbar ±0.1% f.s. (other ranges on request) |
Data memory |
16 MB |
Speed measurement |
2 pcs., 0.0 … 9.9 m/s |
Connection plug |
SUBCONN IL 2 M |
Cable counter plug |
SUBCONN IL 2 F |
Cable connection |
Electro-mechanical single- or multi-conductor cable, one pole can be in contact
|
Cable – Breaking load for shallow
|
approx. 4000 kg |
For deep sea applications
|
approx. 12000 kg |
Max. Cable Resistance
|
1000 Ohms |
Deck Command Unit |
Metal housing for use in 19″ rack or as table housing, push-button control for net changing,
|
Power supply underwater unit |
3 Lithium Batteries DL 123 A/3V, sufficient for approx. 100 hours of operation |
Towing speed (for 300 microns
|
recommended: for vertical tows 1m/s, for horizontal tows 4 knots |
The single / multi-conductor cable |
|
Product ID |
438 140 |