Dissolved oxygen should not be negative. Can you determine the error that created the unusual oxygen profile above?
Q&A: Negative Oxygen Values
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Science and Technology
RS-232 Sensor Integration Guide
Unlike analog auxiliary sensors, instruments that output serial RS-232 data are more challenging to integrate with Sea-Bird Scientific CTDs. Despite RS-232 being a standard communication protocol, most instruments have a unique data output format and command set. As...
Sea-Bird Scientific Photo Contest
From today until April 30th , submit your best photos and view entries to our 5 categories for a chance to win one of several prizes, including Sea-Bird Scientific swag and some grand prizes. Most Biofouled Sea-Bird Scientific instrument: biofouling sets in and–in...
Tech Tip: Cable Search
Consider this hypothetical situation: you find a loose cable with a 6-pin connector and a 4-pin connector - exactly what you need to connect an oxygen sensor to your CTD. However, just because the cable ends fit on the instrument connectors, you still don’t know if...
Q&A: Temperature Mismatch
Although they should match perfectly, the two sensors rarely reported the same temperature value throughout their deployment. Furthermore, the 16plusV2 appeared to stop logging, although the batteries still had life upon recovery. Can you identify the problem?
Tech Tip: Julian Days Format
Tech Tip: Julian Days Format “Julian Days” is a numerical timestamp format, calculated by Sea-Bird Scientific CTDs as the number of the days since Jan 1 of that year (e.g., noon on Feb 3 = 34.5). While this format is useful, it is usually more convenient to display...
Q&A: Diagnosing Salinity Spikes
Q&A: Diagnosing Salinity Spikes The figure above shows a time series of salinity from a moored CTD. For most of the deployment, salinity showed frequent downward spikes, dropping from an expected range of 18-26 psu to near zero. Can you determine the cause?...
Product Update | AC-9 Discontinuation and Service Timelines
In 2011, the Sea-Bird Scientific AC-9 (formerly WETLabs AC-9) was discontinued and replaced by the Sea-Bird Scientific AC-S. We recognize that many users rely on Sea-Bird Scientific products for several years, so we have continued to offer Best Effort Service for the...
Ocean Sciences 2020 Conference Posters
Missed us at Ocean Sciences 2020? Check out digital copies of our Science Team’s conference posters to learn more about what they are working on: Field Performance of an ISFET Based Profiling pH SensorCharles W. Branham, Vladislav Simontov, Yuichiro Takeshita &...
Q&A: Two Symptoms of the Same Problem
May 2020 Newsletter The data above show two major symptoms of the same problem occurring in different locations on a 19plusV2 profiling CTD. On the left, oxygen appears to drop below zero and is highly erratic during the downcast (light blue). However, once it hits a...
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