New products
Autonomus Benthic Lander
Pressure stable battery cylinder
Camera and light
Manta net
Micro Plastic Particle Pump
Mini micro profilers
Plankton Nets
Plankton Pumps
Rosette and Racks
Sediment Samplers
Sediment Trap Station
Small Multi Water Sampler
Vacuum Filtration Station
Water Sampler
Other Products
Museum Equipment
In-situ photos

Digital Flow Meter with back-run stop



Short description:
For determining the amount of water passing through a plankton net. For vertical pull only. For a horizontal pull you can also use flow meter 23.090.

Diameter of propeller/counter body: 70/32 mm, length 185 mm, 5-digit counter; easy installation by a triple point connection of the nosepiece. With back-run stop for vertical operation.

Can be used for full oceanographic depth (free flooding).

Rigging instructions:
Installation of the digital flow meter is made by a triple point connection of the nose piece inside the net ring.

Determination of the water volume passing through a plankton net.

The digital flow meter incorporates a three blade impeller coupled directly to a five-digit counter which records each revolution of the impeller.

Please note that the counter cannot be reset to "0". Before operating the unit, you must note all figures. The number of revolutions is read by noting the difference in beginning and end readings.

The pitch of the impeller is 0,3 m per revolution, i.e., the number of revolutions multiplied by 0.3 makes the towing distance.

For quantitative measurements the threshold flow velocity of the impeller should not be smaller than 0,5 m/sec. For comparison measurements flow velocities smaller than 0,5 m/sec are possible.

Example 1:
The number of revolutions is 100, this means a towing distance of 30 m.

The opening area of the plankton net must be known or has to be calculated. The water volume passed through the plankton net is determined as follows:

Indicated number of revolutions x 0,3 x net opening area (m²) x 1000 = water volume.

Example 2:
The plankton net has a diameter of 40 cm, i.e, the opening area is 0,125 m². If the number of revolutions associated with a tow is 266 (noted from the digital flow meter counter), the water volume passed through the plankton net is:

266 x 0,3 x 0,125 x 1000 = 9975 L= 9,975 m3

caution.gif Rinse with freshwater after use.


Flow meter For vertical pull only
Rotor Polyamide, PA 6.6 Nylon rotor
Nose cone POM Plastic
Body POM plastic
Gear shaft Armaloyed stainless steel main rotor and idler gear shaft
Overall length 19,0 cm
Standard rotor diameter 7,5 cm
Other data
Depth rating Unlimited (free flooding)
Data read out Five ten-digit counter wheels reading 00000 to 99999. One count per rotor revolution
Counter 99999 counts, equal approx. 16,2 nautical miles. The counter cannot be reset. If you need to reset the counter you must use 23.090.
Mounting Universal bridle allowing 3 point connection
Threshold 20 cm/sec
Range 20 cm/sec to 8,0 meter/sec