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Frequently Asked Questions

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Software & Data Processing

The deep SBE41 and SBE61 use the same pressure sensor – a 7000dbar Kistler. And, they are calibrated with the same Paroscientific Digiquartz reference. However, the calibration process is different. A deep SBE41 receives a 2-point sensor only temperature compensation for pressure. The initial accuracy for a deep 41 is +/- 7dbar, typical stability is 2dbar/year. A 61 receives a 4-point temperature compensation for pressure after the instrument is completely assembled, such that the correction includes both the sensor and the electronic boards. The initial accuracy for a 61 is +/-4.5dbar, typical stability is 0.8dbar/year.

The menu to configure the factory parameters you are asking about is accessible through the i*? command. The ? argument for this command will give you a list of all of the arguments to change each individual menu. Let me know if you have any questions about the list of commands in the help menu, and I can try to clarify.

Some cautionary suggestions about changing these parameters:

(1) These parameters should only be changed prior to deployment. Changing them post-deployment could cause you to permanently lose your ability to communicate with the float remotely.

(2) In order to retain Sea-bird Navis warranty coverage, you must provide a log of pre-deployment testing that includes telemetry to your server system after all parameter updates have been performed.

Scientific

The deep SBE41 and SBE61 use the same pressure sensor – a 7000dbar Kistler. And, they are calibrated with the same Paroscientific Digiquartz reference. However, the calibration process is different. A deep SBE41 receives a 2-point sensor only temperature compensation for pressure. The initial accuracy for a deep 41 is +/- 7dbar, typical stability is 2dbar/year. A 61 receives a 4-point temperature compensation for pressure after the instrument is completely assembled, such that the correction includes both the sensor and the electronic boards. The initial accuracy for a 61 is +/-4.5dbar, typical stability is 0.8dbar/year.

Field Procedures & Deployment

The SUNA V2 has capacitors that maintain internal power for to the electronics long enough for a proper shutdown process when external power is removed. However, these capacitors must completely discharge between power cycles, or else the SUNA may fail to properly boot up when external power is reapplied. If your SUNA is stuck in a state where it will not respond to external power, unplug the bulkhead connector completely from the SUNA and wait 30-60 seconds before reapplying external power again.

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