Elster V200 Watermeter Type 8212 Sensor
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Sensor Holder Watermeter Elster V200 Type 8212 / 18 MM Sensor
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Simple design to mount an inductive proximity sensor on your Elster V200 Watermeter Type 8212.
The sensor used is a “M18 DC 5V NPN NO LJ18A3-4-Z/BX-5V 300mA” sensor working on 5 volt. It triggers on the little red wheel in your watermeter and will generate one pulse for every liter used.
You will also need a 10k pullup resistor as the sensor will pull the output low when proximity is detected).
I am using Homeassistant in combination with ESPHome to connect this npn sensor.
Check out
https://www.huizebruin.nl/home-assistant/esphome/watermeter-uitlezen-in-home-assistant-met-esphome/
For more instructions.