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  #1  
Old 09-08-2013
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Raw water pump flow warning buzzer?

Hi All,

I was looking at the engine control panel today, everything on there except a warning for intake cooling water flow. It would only take an in-line flow switch, a buzzer and a protected voltage source. Has anyone installed something like this or ever seen it installed. Yes, we're talking about a caution system to help prevent equipment damage for those of us who may be or get forgetful in our twilight years.

Dave
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Old 09-08-2013
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Re: Raw water pump flow warning buzzer?

These are rare, certainly not a normal factory item either from the engine manufacturer or the boat builder..

As you say it would be simple enough, assuming an appropriately sized (line size and voltage) flow switch can be readily found. You should be able to tie it into the existing multi-point buzzer cct if you can puzzle that out and tie into it.

A pressure switch might be more easily found, more easily installed, and as effective.

EDIT.. belay that last.. it wouldn't detect a plugged passage, as pressure would still be there.. 'doh...
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Old 09-08-2013
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Re: Raw water pump flow warning buzzer?

there are systems you can buy that do this. this is one of the companies AQUALARM :: OnLine Store :: Comersus.
don't really see the need as temperature is whats important and if that is not satisfied then you look for the problem
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Re: Raw water pump flow warning buzzer?

The Aqualarm system works well and it can prevent damage to the impeller of your raw water pump if the intake gets blocked.
When the overheat alarm goes off your impeller is already in little pieces caught in the heat exchanger.
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Re: Raw water pump flow warning buzzer?

Quote:
Originally Posted by hopcar View Post
The Aqualarm system works well and it can prevent damage to the impeller of your raw water pump if the intake gets blocked.
When the overheat alarm goes off your impeller is already in little pieces caught in the heat exchanger.
One of our cruising flotilla boats this past summer could've used such a system.. somehow they lost their impeller, didn't notice until they melted their (plastic) waterlift.. They lost a week waiting for parts.
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Re: Raw water pump flow warning buzzer?

I'd look on things swimming pool heaters, on demand water heaters; to find flow switches.
They are pretty common items in plumbing supply. Most us a paddle and can be set/obtained to on or off with flow.
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Re: Raw water pump flow warning buzzer?

Quote:
Originally Posted by overbored View Post
there are systems you can buy that do this. this is one of the companies AQUALARM :: OnLine Store :: Comersus.
don't really see the need as temperature is whats important and if that is not satisfied then you look for the problem
That's what I'm talking about! Thank you for the reply! Dave
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Re: Raw water pump flow warning buzzer?

We installed an Aqualarm raw water flow detector about 15yrs. ago (photo below). It saved us the very next day when a hose let go. They are far superior to overheat alams as their response is instantaneous. I would not be without one.
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Raw water pump flow warning buzzer?-aqualarm-fow-detector.jpg  
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Re: Raw water pump flow warning buzzer?

Hmmm.. at about $150 or so incl panel, make one wonder why every boat doesn't have one...
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Re: Raw water pump flow warning buzzer?

I don't have a panel. I wired it directly to my ignition switch and bought an alarm buzzer from Radio Shack for $3. I think the flow detector cost $80.00 for the 1 1/2" intake on my engine and the one for my genny was $50.00 as it is only 1" intake.

Pretty sure I bought them on Amazon as they were cheaper than the prices on the Aqualarm website.
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