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MultiNet

Free!

Multiple Plankton Sampler

 

About

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 can be delivered in 4 sizes (apertures): Mini (0.125 m²), Midi (0.25 m²), Maxi (0.5 m²) and Mammoth (1 m²). Depending on the model 5 or 9 net bags are attached to the stainless steel frame with strong canvas part by means of zip fasteners. The net bags are opened and closed by means of levers which 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. 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 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, 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, a stainless steel support is securely attached to the net buckets and enables a quick lowering to depth.

Operation

In its initial position the MultiNet is brought to water with all net bags closed and the water flowing freely through the frame. The instrument can be lowered with high speed to the greatest desired depth. There the first net bag is opened by push-button control from the Deck Command Unit. At the end of the horizontal collection resp. after passing the intended depth interval in case of vertical operation, the first net bag is closed by a second command. The second net is opened simultaneously. This procedure is repeated for the remaining net bags and the Deck Command Unit indicates the number of the currently active net bag. During operations of Mini and Midi versions the last net (no. 5) remains open to collect plankton from the smallest desired depth up to the water surface. Using the Maxi and Mammoth versions the last net (no. 9) can be closed before reaching the water surface.

Offline Use

In case that a conducting cable is not available on board, the required sampling depth can be pre-programmed via personal computer. The activation of the net bags is then carried out automatically according to the pre-selected depth intervals. All measuring 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.

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Product Description

Accessories

CT-Set

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 are 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.

 

Pitch and Roll Sensor

The Pitch and Roll Sensor has been developed for measurements of pitch angle and roll angle of the Underwater Unit of the MultiNet. It allows continuous supervision of the current orientation during horizontal operations.

Options

  • Additional sensors of various parameters
  • Special version for operational depths down to 6000 metres
Spare Parts & Accessories

Spare Net Part

Free!

Spare Net Part (one single net) for MultiNet. Please choose your Multinet Type and mesh size.

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Category:

Spare Canvas Part

Free!

Spare Canvas Part  for MultiNet. Please choose your Multinet Type.

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Category:

Spare Plastic Net Bucket

Free!

Consisting of:
a) Fixing Ring with over centre fasteners for attaching to the end of a net
b) PVC-Net Bucket with side window, covered with sieve gauze

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Soft Net Bucket

Free!

With bolt rope.

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Mounting Ring

Free!

For Soft Net Bucket

Electronic Flow Meter (inner)

Free!

Electronic Flow Meter for MultiNet,
equipped with SUBCONN BH 2 F (Inside)

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Electronic Flow Meter (outer)

Free!

Electronic Flow Meter for MultiNet,
equipped with SUBCONN BH 2 M (Outside)

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CT-Set for MultiNet/Multi Water Sampler

Free!

Additional electronics board,
Conductivity sensor: 0 … 65 ± 0.01 mS/cm
Temperature sensor: -2 … +32 ± 0.005°C
Data rate: 1 Hz (1 data set per second)

Pitch and Roll Sensor

Free!

Channel Pitch: +60° … -60° ± 1° related to the horizontal
Channel Roll: +60° … -60° ± 1° related to the horizontal

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Technical Data

TECHNICAL DATA
Underwater UnitType Mini
No. 438 120
Type Midi
No. 438 130
Type Maxi
No. 438 140
Type Mammoth
No. 438 180
Dimensions (w x l x h)65 cm x 90 cm x 80 cm80 cm x 90 cm x 95 cm120 cm x 110 cm x 135 cm150 cm x 120 cm x 160 cm
Net Opening35.5 cm x 35.5 cm
= 0.125 m²
50 cm x 50 cm
= 0.25 m²
71 cm x 71 cm
= 0.5 m²
100 cm x 100 cm
= 1 m²
Net Bags5 pcs., length: 160 cm5 pcs., length: 250 cm9 pcs., length: 365 cm9 pcs., length: 550 cm
Standard Mesh Size300 µm300 µm300 µm300 µm
Plastic Net Buckets5 pcs., 11 cm dia.5 pcs., 11 cm dia.9 pcs., 11 cm dia.9 pcs., 11 cm dia.
Soft Net Buckets5 pcs., 11 cm dia.5 pcs., 11 cm dia.9 pcs., 11 cm dia.9 pcs., 11 cm dia.
Overall length ready for operation (from bridle to net bucket470 cm560 cm800 cm1000 cm
Weights
Net Frameapprox. 75 kgapprox. 100 kgapprox. 260 kgapprox. 390 kg
Stainless Steel Supportapprox. 30 kgapprox. 50 kgapprox. 70 kgapprox. 100 kg
V-Fin Depth Depressorapprox. 22 kgapprox. 22 kgapprox. 70 kgapprox. 70 kg
Materials
Net FrameStainless SteelStainless SteelStainless SteelStainless Steel
Motor Unit and Battery HousingTitaniumTitaniumTitaniumTitanium
Net BagsMOnylMOnylMOnylMOnyl
Net BucketsPVC/CanvasPVC/CanvasPVC/CanvasPVC/Canvas
V-Fin Depth DepressorAluminium, lead-weightedAluminium,
lead-weighted
Aluminium,
lead-weighted
Aluminium,
lead-weighted
Operational DepthStandard 3000 metresStandard 3000 metresStandard 3000 metresStandard 3000 metres
Pressure SensorStandard 3000.0 dbar
±0.1% f.s.
(other ranges on request)
Standard 3000.0 dbar
±0.1% f.s.
(other ranges on request)
Standard 3000.0 dbar
±0.1% f.s.
(other ranges on request)
Standard 3000.0 dbar
±0.1% f.s.
(other ranges on request)
Offline-SetData memory: 16 MBData memory: 16 MBData memory: 16 MBData memory: 16 MB
Electronic Flow Meter2 pcs., 0.0 ... 9.9 m/s2 pcs., 0.0 ... 9.9 m/s2 pcs., 0.0 ... 9.9 m/s2 pcs., 0.0 ... 9.9 m/s
Connection PlugSUBCONN IL 2 MSUBCONN IL 2 MSUBCONN IL 2 MSUBCONN IL 2 M
Cable Counter PlugSUBCONN IL 2 FSUBCONN IL 2 FSUBCONN IL 2 FSUBCONN IL 2 F
Cable ConnectionElectro-mechanical single- or multi-conductor cable, one pole can be in contact with sea water
Towing CablesType Mini
No. 438 120
Type Midi
No. 438 130
Type Maxi
No. 438 140
Type Mammoth
No. 438 180
Breaking load for shallow water applications
(up to 500 m)
approx. 1500 kgapprox. 2000 kgapprox. 4000 kgapprox. 8000 kg
For deep sea applications (from 500 m up to 3000 m)approx. 5000 kgapprox. 8000 kgapprox. 12000 kgapprox. 18000 kg
Max. Cable
Resistance (go-and-return line)
1000 Ohms1000 Ohms1000 Ohms1000 Ohms
Deck Command Unit:Metal housing for use in 19" rack or as table housing, not for use on deck; push-button control for net changing; indication of net number, pressure, battery status, ... LCD-display with LED backlight; Interface for Personal Computer (RS 232)
Power Supply
Underwater Unit3 Lithium Batteries DL 123 A/3V, sufficient for approx. 100 hours operation
Deck Command Unit85 - 260 VAC85 - 260 VAC85 - 260 VAC85 - 260 VAC
Towing SpeedRecommended for nets with 300 microns standard mesh size
Horizontal Collectionsmax. 4 knotsmax. 4 knotsmax. 4 knotsmax. 4 knots
Vertical Collectionsmax. 1 m per sec.max. 1 m per sec.max. 1 m per sec.max. 1 m per sec.
The single- or multi-conductor cable is not included in our scope of delivery.

Ordering Information

ORDERING INFORMATION 
Products
438 120MultiNet Type Mini, 0.125 m²
438 130MultiNet Type Midi, 0.25 m²
438 140MultiNet Type Maxi, 0.5 m²
438 180MultiNet Type Mammoth, 1 m²
Accessories
450 500CT-Set for MultiNet
Conductivity sensor: 0 ... 65 ± 0.01 mS/cm,
Temperature sensor: -2 ... +32 ± 0.005°C
Data rate: 1 Hz (1 data set per second)
438 161Pitch and Roll Sensor
Channel Pitch: + 60° ... - 60° ± 1° related to the horizontal
Channel Roll: + 60° ... - 60° ± 1° related to the horizontal
Spare Parts
438 123Spare Net Part (one single net) for MultiNet Type Mini
438 127Spare Canvas Part for MultiNet Type Mini
438 133Spare Net Part (one single net) for MultiNet Type Midi
438 137Spare Canvas Part for MultiNet Type Midi
438 143Spare Net Part (one single net) for MultiNet Type Maxi
438 147Spare Canvas Part for MultiNet Type Maxi
438 183Spare Net Part (one single net) for MultiNet Type Mammoth
438 187Spare Canvas Part for MultiNet Type Mammoth
438 150Spare Plastic Net Bucket, consisting of:
a) Fixing Ring with over centre fasteners for attaching to the end of a net
b) PVC-Net Bucket with side window, covered with sieve gauze
438 930Soft Net Bucket with bolt rope
438 935Mounting ring for Soft Net Bucket
438 116-inElectronic Flow Meter (inner) for MultiNet
438 116-outElectronic Flow Meter (outer) for MultiNet