Multi Water Sampler MWS 12


Water Sampling System for Oceanography and Limnology



The approved Multi Water Sampler MWS 12 is an instrument designed for the collection of water samples in successive water layers. Only one operation for 12 different samples! The sturdy stainless steel array is equipped with twelve racks to which Plastic Water Samplers or Free Flow Samplers with capacities from 1.7 to 10 litres capacity can be mounted. The MWS 12 is equipped with a motor-driven release device with an integrated Depth Meter (measuring range according to customers’ requirements). The water samplers are sequentially closed in the succession of their mounting to the array (i.e. No. 1, 2, 3, …, 10, 11 and 12).

The state-of-the-art electronics, optimised in power consumption, are designed for ambient temperatures from – 40°C up to +85°C. The maximum operational water depth is 3000 metres. A special version for operational depths down to 6000 metres is available upon request. The MWS 12 is generally delivered for combined Online/Offline use and is therefore the ideal all-purpose rosette system for use on any research vessel worldwide.



The water samplers are actuated via push-button control by the mains operated Deck Command Unit. The commands for actuation of the water samplers are given via a single or multi-conductor cable between the Underwater Unit and the Deck Command Unit or PC. The Deck Command Unit is equipped with a serial port for data transfer to PC.



In case that a conducting cable is not available on board, the required sampling depth can be pre-programmed via personal computer. The actuation of the water samplers is then carried out automatically according to the pre-selected depth intervals. All measuring data are stored inside the internal data memory (16MB) during the operation and can be read out by a PC when the system 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 are completely integrated into the Motor Unit of the MWS 12. From the CTD data the system computes salinity, density and sound velocity according to UNESCO formulas.



  • Combined online/offline use
  • Bi-directional communication
  • Standard depth range 3000 m
  • Long distance FSK-telemetry (> 10000m)
  • Low power consumption
  • Battery operated Underwater Unit, max. voltage of 5 V at the conductor cable
  • Electronics operate from -40°C up to +85°C
  • EC-conformity (CE) EN 50081-1, EN 50082-1
  • Variant array sizes for 24 water samplers are available upon request
  • Additional sensors of various parameter
  • Special version for operational depths down to 6000 metres

Automatic Fluid Injection Sampler AFIS



Plastic Water Sampler PWS



Free Flow Water Sampler (MWS 12)



CT-Set for MultiNet/Multi Water Sampler


CT-Set with an applicational depth of 6000m,
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)
response time: 100ms

Dimensions1.7 - 5 L: Ø 110 x 125 cm (dia. x h);
10 L: Ø 110 x 140 cm (dia. x h)
Empty Weight1.7 - 5 L: approx. 75 kg;
10 L: approx. 85 kg
Operational Depthmax. 3000 metres
Arraymade of stainless steel
Motor Unitmade of titanium, battery powered (3 x DL 123A/3V)
Deck Command Unitmetal housing for use in 19" -rack or as table housing, not for use on deck; push-button control for closing of water samplers,
indication of sampler no., pressure, battery status, optional CTD data.
LCD-display with LED backlight, interface for Personal Computer (RS-232), power supply: 85 - 260 V AC
Data Memory16 MByte
Pressure Sensor
(Depth Meter)
0.0 ... 3000.0 dbar ± 0.1% f.s. (standard)
436 912Multi Water Sampler MWS 12 for
12 Plastic Water Samplers or Free Flow water Samplers
of 1.7 to 5 l capacity
436 913Multi Water Sampler MWS 12 for
12 Plastic Water Samplers or Free Flow water Samplers
of 10 l capacity

Please note: The Multi Water Sampler MWS 12 is delivered without Water Samplers, they have to be ordered separately!

436 300Plastic Water Sampler PWS, capacity 1.7 litres
436 302Plastic Water Sampler PWS, capacity 2.5 litres
436 305Plastic Water Sampler PWS, capacity 5.0 litres
436 315Plastic Water Sampler PWS, capacity 10.0 litres
436 340Free Flow Water Sampler, capacity 1.0 litre
436 345Free Flow Water Sampler, capacity 5.0 litres
436 346Free Flow Water Sampler, capacity 10.0 litres
436 430Automatic Fluid Injection
Sampler AFIS
450 500CT-Set for Multi Water Sampler
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)