For determining the amount of water passing through a plankton net. For horizontal pull only.
Diameter of propeller/counter body: 70/32 mm, length 185 mm, 5-digit counter; easy installation by a two-point connection of the nose piece.
Can be used for full oceanographic depth (6000 m).
The digital flow meter may be used with towed equipment such as plankton nets, etc., or in stationary applications such as flow monitoring of rivers and outfalls. The digital flow meter is supplied with a towing bridle which can be used in two different ways:
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 is non-resetting. 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 mulitiplied 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 horizontal 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 can be reset to "0".|
|Mounting||Universal bridle allowing two-point connection|
|Range||20 cm/sec to 8,0 m/sec|