The logical codes associated to each parameter are:
Logical code 114 = Fluorometer Chl-(a)
115 = CDOM
116 = Scattering
117 = Phycocyanin
118 = Phycoerithrin
119= Rhodamine
120= Uranine
Description A seven-character acronym that is used by the probe to identify data acquired from
this sensor.
No. of digits to show 6
No. of digits after the dot 2
Do you want to store it ? Yes
Do you want to show data ? Yes
Data processing method: 2 = Proprietary&UNESCO
Mux. Channel 246
Mux. Delay 0
Note
The parameter configuration must be repeated for each ECO sensor.
The calibration procedure of the ECO sensors implies the introduction of the WETLAB original
coefficients found in the “characterization sheet” accompanying the instrument. After selecting the ECO
sensor from the list of sensors, then the operator must enter in sequence:
ECO Sensor dark counts
ECO Sensor scale factor
5.6.5 LICOR - PAR Sensor
The LICOR LI-193SA Underwater Spherical Quantum
Sensor gives an added dimension to underwater PAR
measurements as it measures photon flux from all
directions. This measurement is referred to as
Photosynthetic Photon Flux Fluence Rate (PPFFR) or
Quantum Scalar Irradiance. This is important, for example,
when studying phytoplankton, which utilizes radiation
from all directions for photosynthesis. The LI-193SA
features a high sensitivity optical design and compact,
rugged construction (3400 kPa, 350 meters depth). The LI-
193SA analogue interface of the OCEAN SEVEN 310 probe
transforms, by means of a linear current to voltage pre-amplifier, the LI-193SA sensor output (current
in µA) into ADC counts. Calculation of the calibration coefficients implies a preliminary calculation that
is carried out by using the LICOR calibration certificate and the probe calibration certificate. By applying
the below calculation, the OCEAN SEVEN 310 transforms the sensor readings into μmol s-1 m-2.
Calibration constants
LI-193SA calibration constant in water = 4.71 μA per 1000 μmol s-1 m-2
OCEAN SEVEN 310 Full Scale current = 9.83 μA equivalent to = 131072 ADC counts
Calculation of the full scale PAR sensor
F.S. (9.83 μA / 4.71) * 1000 = 2087.048832 μmol s-1 m-2
Afterwards, the calibration coefficients (a+bx) can be calculated using the value tabled below:
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