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How many pH samples can you fit into a year?

Battery endurance

How long can you really trust your sensor to sip energy from its batteries? Properly selecting the right sample interval must strike a balance between a high-resolution dataset and a complete time-series. After some quick calculations, we’ve found the optimal sample intervals to achieve anywhere  from 60,000 – 1,100,000 pH samples into a high-resolution, year-long pH dataset.

Battery Endurance LP

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.

* 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 how to replace batteries on a SeaFET V2, watch the videos below:

July 1, 2019

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