Originally posted by Karam
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From what I recall, and using this guide as an aide memoire (http://www.davidson.com.au/products/...iter-guide.pdf) we used the fixed-range "PTX 1400" models. These also use the standard 2-wire, 4-20mA interface (we were going into a PLC).
Originally posted by Karam
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More info here: http://www.sensor-systems.com/produc...ion.html#Sonic Prices typically are <£100
Or there's this from Velleman:
and/or this http://www.amazon.com/VELLEMAN-WATER.../dp/B0002Z82O4
and replace the buzzer with a relay, then the dry contact (sorry, no pun intended...) goes into the AH system
HTH,
Tim.
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