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).
Installation of the digital flow meter is made by a triple point connection of the nose piece inside the net ring.
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.
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.
266 x 0,3 x 0,125 x 1000 = 9975 L= 9,975 m3
Rinse with freshwater after use.
|Flow meter||For vertical pull only|
|Rotor||Polyamide, PA 6.6 Nylon rotor|
|Nose cone||POM Plastic|
|Gear shaft||Armaloyed stainless steel main rotor and idler gear shaft|
|Overall length||19,0 cm|
|Standard rotor diameter||7,5 cm|
|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|
|Range||20 cm/sec to 8,0 meter/sec|