On 24/10/2019 07:56, thescullster wrote:
Envireau and the system was sold as a rain water recovery solution.

Possibly a more modern installation

https://www.direct-drainage.co.uk/wp... ng_System.pdf

but mentioned:

Differential sensor has a 4 core cable:-
red (5V) €“connected to pin 1-
green (GND) €“connected to pin 2-
yellow (+Out) €“connected to pin 3-
blue (-Out) €“connected to pin4.

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