User`s manual

Section 4: Configure Inputs, Part II - Calibration Coefficients
46
PAR/Irradiance Calibration Coefficients
Underwater PAR Sensor
Enter M, B, calibration constant, multiplier, and offset.
PAR = [multiplier * (10
9
* 10
(V-B) / M
) / calibration constant] + offset
where
calibration constant, M, and B are dependent on sensor type;
multiplier = 1.0 for output units of μEinsteins/m
2
sec
• Biospherical PAR sensor
- PAR sensor with built-in log amplifier (QSP-200L, QCP-200L,
QSP-2300L, QCP-2300L, or MCP-2300)]:
Typically, M = 1.0 and B = 0.0.
Calibration constant
= 10
5
/ wet calibration factor from Biospherical calibration sheet.
- PAR sensor without built-in log amplifier (QSP-200PD, QSP-2200 (PD),
or QCP 2200 (PD)):
M and B are taken from Sea-Bird calibration sheet.
Calibration constant
= C
S
calibration coefficient from Sea-Bird calibration sheet
= 6.022 x 10
13
/ C
w
from Biospherical calibration sheet
• LI-COR PAR sensor
Calibration constant is in water calibration constant (in units of
μamps/1000 μmoles/m
2.
sec) from Licor or Sea-Bird calibration sheet.
M and B are taken from Sea-Bird calibration sheet.
• Chelsea PAR sensor
Calibration constant = 10
9
/ 0.046
M = 1.0 / (log e * A1 * 1000) = 1.0 / (0.43429448 * A1 * 1000)
B = - M * log e * A0 = - A0 / (A1 * 1000)
where A0 and A1 are constants from Chelsea calibration sheet with an
equation of form: PAR = A0 + (A1 * mV)
Note: SEASAVE can process data for an instrument interfacing with up to two
underwater PAR/irradiance sensors.
Biospherical Surface PAR Sensor
A surface PAR sensor is selected by clicking Surface PAR voltage added in
the Configure dialog box. Enter conversion factor and ratio multiplier.
Notes:
• See Application Note 11General
for multiplier values for output units
other than μEinsteins/m
2
sec.
• See Application Notes 11QSP-L
(Biospherical sensor with built-in
log amplifier), 11QSP-PD
(Biospherical sensor without built-
in log amplifier), 11Licor (LI-COR
sensor), and 11Chelsea for
complete description of calculation
of calibration coefficients for
underwater PAR sensors.
•
Selection of Par / Irradiance,
Biospherical / Licor as the voltage
sensor is also applicable to the
Chelsea PAR sensor.
Notes:
• See Application Note 11 General
for conversion factor values for
output units other than
μEinsteins/m
2
sec.
• For complete description of
calculation of calibration
coefficients for surface PAR,
see Application Note 11S
(SBE 11plus Deck Unit) or
47 (SBE 33 or 36 Deck Unit).