Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of WikiWatershed, a web toolkit designed to help citizens, conservation practitioners, municipal decision-makers, researchers, educators, and students advance knowledge and stewardship of fresh water. New to EnviroDIY? Start here

Reply To: HYDROS 21 no longer vented… any idea when this changed?

Home Forums Environmental Sensors HYDROS 21 no longer vented… any idea when this changed? Reply To: HYDROS 21 no longer vented… any idea when this changed?

#15524
neilh20
Participant

    Do note that the specifications says accuracy  0.5% of 10,000m or +/-50mm (edit  corrected to 50mm). This  implies that you want to keep it at a constant (20C?) while sitting in the bucket, and even then the apparent water level can wander up  +50mm  or down -50mm and still be within specification.    If the temperature changes then the accuracy specification doesn’t apply.

    https://www.metergroup.com/environment/products/hydros-21-water-level-monitoring/

    Water depth
    Range: 0−10,000 mm
    Resolution: 1 mm
    Accuracy: ±0.5% of full scale at 20 °C

    NOTE: Depth measurement accuracy assumes no abrupt temperature variations.

    For environmentally significant flows (low water depth measurement, with high temperature variation) it has a lot of noise on the signal.

    Great instrument for measuring borehole water pumping ground water that is usually a constant temperature and large variation in depth.