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Reply To: Keller CTD Sensor

Home Forums Environmental Sensors Keller CTD Sensor Reply To: Keller CTD Sensor

Anthony Aufdenkampe

    I’ll second Neil, and say that Keller sensor are very high quality and work really well with Mayfly RS485 integrations. I’ve helped deploy many AccuLevel sensors.

    There’s a small chance that Keller 36XiW-CTD uses the same Modbus map as the Acculevel, but I think it is unlikely. You’ll need to get the Modbus documentation from Keller for that. I found that Keller’s tech support staff was super helpful.

    The place to define the Modbus map for this sensor andstart testing is here: https://github.com/EnviroDIY/KellerModbus.   That’s the library that ModularSensors uses.

    SDI-12 has the benefit that it uses universal commands, doesn’t require a special “map”, and can generally be implemented on the Mayfly without a special adapter board. The drawback of SDI-12 is that it has a much less stable communication protocol (both logical and physical), and often the sensors are more expensive to purchase that Modbus options.