I have also been looking ...

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  I have also been looking for something as an alternative to my disastrous experiences with on-line ISE electrodes.  Take a look at https://www.ott.com/product-guide-ott-econ-low-maintenance-uv-nitrate-in-situ-sensor/  and  https://realtechwater.com/products/uv-vis-sensors/nl-series/  which use UV absorbtion measurement for readings.  I like the idea of low maintenance and no calibration.