Important Information
Page | 7
©
2021
– Valeport Ltd
3.5.2
Turbidity
Valeport's Turbidity technology is essentially two sensors in one. The first is a “classic”
nephelometer, using a 90˚ beam angle for turbidity levels between 0 and 2000 NTU. The second
sensor uses optical backscatter -
OBS (~120˚ beam angle) for turbidity levels beyond 10 000 NTU.
Both sensors output data simultaneously, at a programmable rate, so there is no need to switch
ranges as conditions vary. Intelligent sampling and the use of a 24 bit ADC eliminates the need to
switch gain. The optical head is very compact, measuring just 20mm diameter and is rated to full
ocean depth.
Excitation\Detection:
850nm
Linear Range:
Nephelometer 0 to >1 000 NTU - linear response
Optical Backscatter: 0 to 4 000 NTU - linear response
(>4,000 NTU has a non-linear monotonic response that allows
derivation of higher values using look-up tables)
Minimum Detection Level
0.03 NTU
3.5.2.1 Safety Statement
The Turbidity sensor is classified EXEMPT under the standard 62471.
As a Valeport Turbidity sensor is classified as EXEMPT a hazard label in not required.
Never look directly into the optical aperture
3.6
Calculated Parameters
3.6.1
SWiFT SVP
3.6.1.1 Calculated Conductivity
From directly measured sound velocity, temperature and pressure, SWiFT calculates Salinity using
a proprietary Valeport algorithm developed from extensive laboratory and fieldwork. This salinity
value is then used to compute conductivity using standard EOS80 formulas.
Type:
Calculated
Accuracy:
±0.05 mS/cm
Resolution:
0.001 mS/cm
3.6.1.2 Calculated Salinity
From directly measured sound velocity, temperature and pressure, SWiFT calculates Salinity using
a proprietary Valeport algorithm developed from extensive laboratory and fieldwork.
https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lom3.10203
Type:
Calculated
Accuracy:
±0.05 PSU
Resolution:
0.001 PSU
Содержание SWiFT
Страница 47: ...Important Information Page 43 2021 Valeport Ltd 11 1 SWiFT and SWiFT plus 11 1 1 EU Declaration of Conformity...
Страница 48: ...Declarations of Conformity 2021 Valeport Ltd Page 44 11 1 2 UK Declaration of Conformity...
Страница 49: ...Important Information Page 45 2021 Valeport Ltd...
