How many pH samples can you fit into a year?
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 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:
The pH sensor on the new HydroCAT-EP V2 is accurate to 0.1 pH for 90 days, reducing the time you need to spend on maintenance. Beyond that, calibration is a simple process that users can do in the lab or field. Watch Cody Littleton, our primary HydroCAT-EP Service...
The new HydroCAT-EP V2 has increased durability for long-term moored deployments in the open ocean, coastal, and freshwater coastal environments. Enhanced sealing surfaces throughout the instrument provide greater reliability in inhospitable conditions, ensuring high...
Art Pedersen, founder of Sea-Bird Electronics, passed away on October 8th, 2021. His designs are firmly cemented into Sea-Bird’s CTDs, and he leaves behind profound impacts on how scientists make measurements in the ocean. Dr. Norge Larson, former president of...