Battery endurance for our line of ISFET pH sensors varies with the sampling regime: are you transmitting data in real-time? Do you have a CTD? Are you powering that CTD from its own batteries, or from the SeaFET? We stepped through some power estimations for create the table below, assuming a sensor with brand-new batteries is deployed in 17 °C water.
|
Instrument/Configuration |
Sample Interval |
Estimated Deployment Length |
Estimated Number of Samples |
|
Shallow SeaFET V2 |
30 seconds |
400 days*
|
1,150,000 |
|
Shallow SeapHOx V2, not powering the CTD |
90 seconds |
360 days |
342,000 |
|
Shallow SeapHOx V2, powering the CTD |
500 seconds |
340 days |
60,000 |
|
Deep SeapHOx V2, not powering the CTD |
90 seconds |
360 days |
342,000 |
|
Shallow SeapHOx V2, powering the CTD |
500 seconds |
350 days |
60,000 |
* Note: The DuraFET is rated for 1-year of accuracy
If there’s any takeaway here, it’s that the SeaFET V2, SeapHOx V2, and Deep SeapHOx V2 can be configured to provide a data-dense long-term time series, previously unachievable with other pH-sensing technology. Also, it certainly helps to deploy a SeapHOx V2 or Deep SeapHOx V2 with batteries in the CTD—if necessary, you can always configure a drop-in replacement to extend the CTD’s deployment endurance.
To learn more about our ISFET pH sensors, including how to replace batteries, watch some of our videos online.
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