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nexxo · 11-11-2002, 12:58 PM

Several threads exist on this subject. One referred to Dwyer as the place to go and it is indeed recommended! Check these babies out for example:

Both have 1/2" connectors and work on 12V.

I found a couple of useful ones on RS-Online; a cool-ass flow indicator...

(the metal bits are sold seperately and some accomodate 1/2" connections)

... and two flow sensors. This one

operates on 5V and senses upto 20 l/min flow (a 300 GPH pump produces 18 l/min). It emits 750 pulses per litre flow; at 18 l/min that is 13500 pulses per minute; similar to a (admittedly very fast) CPU fan. Connections are 3/8".

This one

has 1/2" connections, runs on anything between 4.5V and 24V, and emits 23 pulses per second at 12 l/min flow. At the aforementioned 300 GPH (18 l/min.) that is 2175 pulses per minute, i.e. similar to a somewhat slow CPU fan.

The idea is that when flow stops, so do the pulses, similar to a fan stalling. This should prompt the mobo to perform a shutdown.

11-11-2002, 12:58 PM	#9
nexxo Cooling Savant Join Date: Jul 2002 Location: Brimingham, UK Posts: 385	Several threads exist on this subject. One referred to Dwyer as the place to go and it is indeed recommended! Check these babies out for example: Both have 1/2" connectors and work on 12V. I found a couple of useful ones on RS-Online; a cool-ass flow indicator... (the metal bits are sold seperately and some accomodate 1/2" connections) ... and two flow sensors. This one operates on 5V and senses upto 20 l/min flow (a 300 GPH pump produces 18 l/min). It emits 750 pulses per litre flow; at 18 l/min that is 13500 pulses per minute; similar to a (admittedly very fast) CPU fan. Connections are 3/8". This one has 1/2" connections, runs on anything between 4.5V and 24V, and emits 23 pulses per second at 12 l/min flow. At the aforementioned 300 GPH (18 l/min.) that is 2175 pulses per minute, i.e. similar to a somewhat slow CPU fan. The idea is that when flow stops, so do the pulses, similar to a fan stalling. This should prompt the mobo to perform a shutdown. __________________ "There is a thin line between magic and madness" Last edited by nexxo; 11-11-2002 at 01:10 PM.