User`s manual
Table Of Contents
- SEASAVE
- Limited Liability Statement
- Table of Contents
- Section 1: Introduction
- Section 2: Installation & Use
- Section 3: Configure Inputs, Part I - Instrument Configuration (.con file)
- Introduction
- Instrument Configuration
- Viewing, Modifying, or Creating .con File
- SBE 9plus Configuration
- SBE 16 SEACAT C-T Recorder Configuration
- SBE 16plus SEACAT C-T Recorder Configuration
- SBE 19 SEACAT Profiler Configuration
- SBE 19plus SEACAT Profiler Configuration
- SBE 21 Thermosalinograph Configuration
- SBE 25 SEALOGGER Configuration
- SBE 45 MicroTSG Configuration
- SBE 49 FastCAT Configuration
- Section 4: Configure Inputs, Part II - Calibration Coefficients
- Accessing Calibration Coefficients Dialog Boxes
- Calibration Coefficients for Frequency Sensors
- Calibration Coefficients for A/D Count Sensors
- Calibration Coefficients for Voltage Sensors
- Pressure (Strain Gauge) Calibration Coefficients
- Altimeter Calibration Coefficients
- Fluorometer Calibration Coefficients
- Methane Sensor Calibration Coefficients
- OBS/Nephelometer Calibration Coefficients
- Oxidation Reduction Potential (ORP) Calibration Coefficients
- Oxygen Calibration Coefficients
- PAR/Irradiance Calibration Coefficients
- pH Calibration Coefficients
- Pressure/FGP (voltage output) Calibration Coefficients
- Suspended Sediment Calibration Coefficients
- Transmissometer Calibration Coefficients
- User Polynomial (for user-defined sensor) Calibration Coefficients
- Zaps Calibration Coefficients
- Section 5: Configure Inputs, Part III – Serial Ports, Water Sampler, TCP/IP Ports, Miscellaneous, & Pump Control
- Section 6: Configure Outputs
- Section 7: Display - Setting Up SEASAVE Displays
- Section 8: Real-Time Data & Real-Time Control - Real-Time Data Acquisition
- Section 9: Archived Data Displaying Archived Data
- Section 10: Processing Data
- Appendix I: Command Line Operation
- Appendix II: Configure (.con) File Format
- Appendix III: Software Problems
- Appendix IV: Derived Parameter Formulas
- Index
Section 4: Configure Inputs, Part II - Calibration Coefficients
48
Transmissometer Calibration Coefficients
• Sea Tech, Chelsea (Alphatracka), and WET Labs Cstar
Enter M, B, and path length (in meters)
Path length (distance between lenses) is based on sensor size
(for example, 25 cm transmissometer = 0.25m path length, etc.).
light transmission (%) = M * volts + B
where
M = ( Tw / [W0 – Y0] ) ( A0 – Y0 ) / ( A1 – Y1 )
B = - M * Y1
and
A0 = factory voltage output in air (factory calibration from transmissometer
manufacturer)
A1 = current (most recent) voltage output in air
Y0 = factory dark or zero (blocked path) voltage (factory calibration from
transmissometer manufacturer)
Y1 = current (most recent) dark or zero (blocked path) voltage
W0 = factory voltage output in pure water (factory calibration from
transmissometer manufacturer)
Tw = % transmission in pure water
(for transmission relative to water, Tw = 100%; or
for transmission relative to air, Tw is defined by table below.
Tw = % Transmission in Pure Water
(relative to AIR)
Wavelength 10 cm Path Length 25 cm Path Length
488 nm (blue) 99.8% 99.6%
532 nm (green) 99.5% 98.8%
660 nm (red) 96.0 - 96.4% 90.2 - 91.3%
Transmissometer Example
(from calibration sheet) A0 = 4.743 volts, Y0 = 0.002 volts,
W0 = 4.565 volts
Tw = 100% (for transmission relative to water)
(from current calibration) A1 = 4.719 volts and Y1 = 0.006 volts
M = 22.046
B = - 0.132
Note: SEASAVE can process data for an instrument interfacing
with up to two transmissometers in any combination of Sea Tech,
Chelsea Alphatracka, and WET Labs Cstar, when using the New
Style configuration.
• WET Labs AC3
This sensor requires two channels - one for fluorometer voltage (listed
under fluorometers in the dialog box) and the other for transmissometer
voltage (listed under transmissometers). Make sure to select both when
configuring the instrument.
Enter Ch2o, Vh2o, VDark, and X from calibration sheet.
Beam attenuation = {[log (Vh2o - VDark) - log (V - VDark)] /X} + Ch2o
Beam transmission (%) = exp ( -beam attenuation * X) * 100
Note:
See Application Note 7 for
complete description of
computation of M and B.