SUNA Archives - Sea-Bird Scientific Blog

My SUNA nitrate sensor is not transmitting or storing valid nitrate concentration data in high sediment, high turbidity, low light transmission environments, or freshwater inrush events. What can I do to mitigate this?

SUNAs ordered with the 5mm path length coupler as a factory option will perform much better in low light transmission waters due to the shorter length the light needs to travel leading to less absorption. Equipping your SUNA with the factory bio-wiper option will also...

What theory is the temperature / salinity correction for SUNA based on? Does this correction only work in natural seawater?

The temperature and salinity correction for the SUNA can be traced to the experiment outlined in Sakamoto et al. 2009, which is the T/S correction our UCI-based SUNA software uses in post-processing only. Absorption of UV light in seawater is dominated by dissolved...

When should the SUNA (V1 or V2) be sent in for service to get the lamp replaced?

When your max lamp counts drop below 30,000 during the self test and cannot recover with cleaning, you can send the lamp in for inspection. If your lamp time remaining is less than 25% then it is best to send the SUNA in for a lamp replacement. We will automatically...

What research is the temperature / salinity correction for SUNA nitrate data based on? Does this correction only work in natural seawater?

The temperature and salinity correction for the SUNA can be traced to the experiment outlined in Sakamoto et al. 2009, which is the T/S correction our UCI-based SUNA software uses in post-processing only.nnAbsorption of UV light in seawater is dominated by dissolved...

My SUNA V2 fails the self-test function when it tries to report the internal voltage measurements.

Although most functions of the SUNA V2 can be accomplished though the USB connection, parts of the self-test require that external power be applied. In this case, connect external power and repeat the test. If the problem persists, please contact Customer Support.

How does absorption from CDOM affect the SUNA V2 nitrate measurement?

The SUNA V2 determines nitrate concentrations from the shape of the UV absorption curve. The least squares curve fitting algorithm uses calibrated extinction coefficients for nitrate and bromide (strong absorbing species in salt water) to calculate the concentration...

What is “adaptive sampling” and how does it work?

The SUNA V2 contains a 256 channel spectrometer that is programmed to integrate for a specific length of time (usually 300 - 500 ms) while sampling to maximize signal. That is, when the SUNA V2 takes a sample, the spectrograph collects UV light for the length of the...

What is the common or base environmental sensor suite, and what options are there for other sensors?

The base sensing suite includes a FastCat CTD, a combined fluorescence and turbidity sensor, and a PAR sensor. The current supported list of instruments for Thetis include: CTD: SeaBird FastCat CTD (SBE49) Dissolved oxygen: SeaBird SBE43 or SBE63 Chlorophyll: ...

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...

When running my SUNA V2 on the bench, the data shows that the lamp is turning on and off. Why is this happening?

This is a safety feature of the instrument, whereby the lamp is turned off when its temperature reaches 35°C (95°F) to prevent damage from overheating. The SUNA continues to output dark frames while monitoring the temperature, and will restart the lamp once it has...

Scripps Technical Forum | AC-S: The Telescope Into the Rainbow of Ocean Life

Scripps Technical Forum Time: Thursday, April 06, 2023 | 12:00 PM to 1:00 PM Location: Hydraulics Lab Mezzanine Sea-Bird Scientific is grateful for the opportunity to present at a Technical Forum to the Scripps Institute of Oceanography community. In this session,...

February 2023 Newsletter

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Announcing the NEW LED AC-S

We are more than ecstatic to announce the release of the NEW LED AC-S Spectral Absorption and Attenuation Sensor. It is the first of its kind, and a standalone transmissometer in the market. The AC-S provides in-situ optical data of beam transmission and absorption...

SUNA

My SUNA nitrate sensor is not transmitting or storing valid nitrate concentration data in high sediment, high turbidity, low light transmission environments, or freshwater inrush events. What can I do to mitigate this?

What theory is the temperature / salinity correction for SUNA based on? Does this correction only work in natural seawater?

When should the SUNA (V1 or V2) be sent in for service to get the lamp replaced?

What research is the temperature / salinity correction for SUNA nitrate data based on? Does this correction only work in natural seawater?

My SUNA V2 fails the self-test function when it tries to report the internal voltage measurements.

How does absorption from CDOM affect the SUNA V2 nitrate measurement?

What is “adaptive sampling” and how does it work?

What is the common or base environmental sensor suite, and what options are there for other sensors?

Should I provide my ISUS or SUNA with a warmup time before recording data?

When running my SUNA V2 on the bench, the data shows that the lamp is turning on and off. Why is this happening?

Featured Posts

Scripps Technical Forum | AC-S: The Telescope Into the Rainbow of Ocean Life

Announcing the NEW LED AC-S

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