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Visibility Disc acc. to Secchi

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Water transparency determination in lakes and oceans acc. to ISO 7027

 

About

The Visibility Disc acc. to Secchi is a white lacquered brass disk with a diameter of 200 mm or NEW 300mm and a weight of 1.7 kg(200mm) and 2.3 kg (300mm). It is an easy-to-use instrument for standard monitoring of water transparency in lakes and oceans. The standard Visibility Disc (200mm) is equipped with a rope of 3 meters in length. The first 2 meters of rope above the disc have 10 marks every 20 cm for measurement purpose.
The lager Visibility Disc (300mm) is equipped with a rope of 10 meters in length. The first 8 meters of rope above the disc have marks every 10 cm for measurement purpose.

The Visibility Disc is lowered into the water and the immersion depth is read from the marked rope at the moment the disc vanishes from sight. It is lowered another 0.5 m and then heaved slowly again. The second reading is made when the disc reappears. The arithmetic mean from both readings equals the visibility depth.

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Product Description

ORDERING INFORMATION
Products
443 590Visibility Disc acc. to Secchi, dia. 20cm
with 3 m rope, marks every 20 cm
443 593Visibility Disc acc. to Secchi, dia. 30cm,
10m steel rope, marks every 10cm
on the first 8m above the disc.

Additional Information

Disc-Variation

dia. 20cm with 3 m rope, marks every 20 cm, dia. 30cm, 10m steel rope, marks every 10cm