Aqualarm Raw Water Flow Alarm in a 21EC

A while back there was talk of raw water and/or exhaust temp sensors/alarms.

I bought the Aqualarm from Defender.com sized for the 3/4" raw water hose. I installed the flow sensor inline AFTER the strainer...my thinking was that there would be less 'junk' passing through the sensor if it received raw water which had been 'strained.'

This is the installation:


The kit I ordered included an alarm buzzer and dash-mounted LED which glows red when there is no flow. The alarm circuit is powered from the ignition, so it buzzes like the low oil pressure alarm when the key is turned on before cranking the engine to start up. It stops very soon after the engine starts in most cases.

I have tested it by turning off the raw water valve...it IMMEDIATELY alarmed. I was impressed with how quickly it reacted.

Thus far I have about 10 engine hours with the sensor/alarm in place and it seems good.

Fair winds and good raw water flow,

david

Another good idea of yours, Dave. Many thanks. Stevan

If you don't want to get involved with the ignition switch for power. I don't with Volvo's fob start set up. Just install an off / on switch to switch power on to the water flow sensor. Throw the new off / on switch to on and start and start the engine. You can pull power from anywhere if you install a separate switch to kill power to the water flow sensor so it is not going off while the engine is in the off mode.