Sea-Bird Scientific has developed cosine collectors that are specifically designed to optimize performance in the intended media of operation (air or water). So in water irradiance sensors have cosine collectors that provide an excellent response in water but not in...
FAQs
Can Sea-Bird provide some guidance for ordering cable, winch, and deck gear?
For a Sea-Bird CTD used with one of our Deck Units (SBE 11plus, SBE 33, or SBE 36), the electrical requirements of the armored cable are simple. Only one conductor is required (the armor is used as ground) and the total 2-way resistance (conductor plus armor) should...
How does the ISUS compensate for long term drift?
Because the ISUS is an active optical instrument with an internal UV light source and spectrometer, gradual changes in the baseline spectra can occur. To check for instrument drift, we recommend users check the baseline prior to deployments by sampling an aliquot of...
How can I tell if the conductivity cell on my CTD is broken?
Conductivity cells are made of glass, which is breakable. If a cell is cracked, it typically causes a salinity shift or erratic data. However, if the crack occurs at the end of the cell, the sensor will continue to function normally until water penetrates the epoxy...
I am planning on doing a mooring deployment which requires relatively tightly spaced sampling. Are there any issues I need to consider when making a schedule file?
There are three main points to consider when making a new schedule:Power: if you are using a battery to power the ISUS, make sure you have enough battery capacity to cover the schedule you intend to use. The ISUS draws about 7 watts of power with the...
What are the major steps involved in taking a cast with a Profiling CTD?
Following is a brief outline of the major steps involved in taking a CTD cast, based on generally accepted practices. However, each ship, crew, and resident technicians have their own operating procedures. Each scientific group has their own goals. Therefore,...
How does the ISUS compensate for long term drift?
Because the ISUS is an active optical instrument with an internal UV light source and spectrometer, gradual changes in the baseline spectra can occur. To check for instrument drift, we recommend users check the baseline prior to deployments by sampling an aliquot of...
Should I collect water samples (close bottles) on the downcast or the upcast?
Most of our CTD manuals refer to using downcast CTD data to characterize the profile. For typical configurations, downcast CTD data is preferable, because the CTD is oriented so that the intake is seeing new water before the rest of the package causes any mixing or...
Should I provide my ISUS or SUNA with a warmup time before recording data?
We recommend updating the ISUS or SUNA's reference spectrum portion of the calibration with the instrument in the same state it will be used in the field. To update the reference spectrum, you will have to run the calibration feature in ISUSCom or UCI using a pure...
Can I deploy my profiling CTD for monitoring an oil spill?
Sea-Bird CTDs can be deployed in oil; the oil will not cause long-term damage to the CTD. If the oil coats the inside of the conductivity cell and coats the dissolved oxygen sensor membrane, it can possibly affect the sensor’s calibration (and thus affect the...
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