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Old 07 October 2009, 13:13   #1
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On delay switch

Can anyone point me in the right direction for a marine 'on delay timer' The cunning plan is to incorporate this along with a piezo in the bilge positive.

There are lots on the net that wouldn't last two minutes in the sea air etc.

The objective is to time how long the bilge pump takes to empty the well,set the timer to sound the piezo at this duration, so in effect the sound is the reason to switch it off,I won't have to look to see if there is still water present.

As an additional wee question, are the carling switches easy to remove from consol,(I don't want to break it to find out) as I want to fit one that illuminates.
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Old 07 October 2009, 14:29   #2
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Ian would your float switch not switch it off for you?
Billy
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Old 07 October 2009, 14:57   #3
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http://www.waterwitch.info/

There are others out there as well.


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Old 07 October 2009, 14:59   #4
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Ian would your float switch not switch it off for you?
Billy
I think they are unreliable,it also means a break in the line back there ,so another oppertunity for corrosion,in addition to this the space in the well is limited after I fitted a fairly substantial transducer and the finally I decided against one as it means more screw holes...

The pumps feed is seperate to the breaker switch, so if inadvertently left on a float would keep running as the boat filled up with rain water,even on the trailer; flattening the battery. I would hear a piezo.

Thanks anyway..
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Old 07 October 2009, 15:10   #5
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http://www.waterwitch.info/

There are others out there as well.


jky
I had a look at those,but they seem to only do-

switch on then timer delay to switch off.

I'm looking for:

Switch on - then timer delay to 'on' - Piezo.
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Old 07 October 2009, 16:00   #6
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Maplins sounds like the place for you to look see here for one such timer and there are a few others, just search for timers.

You could also house it in a waterproof enclosure, they stock them to.
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Old 08 October 2009, 03:05   #7
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Maplins sounds like the place for you to look see here for one such timer and there are a few others, just search for timers.

You could also house it in a waterproof enclosure, they stock them to.
I've looked at these,the problem I think I would have is if the power is cut because you disconnected the Main boat battery you would have to reset the timer which would mean digging it out of dash/waterproof box.

If I could fing one that had a rotary mech setting, or back up watch battery it wouldn't be an issue.

Thanks anyway.
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Old 08 October 2009, 03:59   #8
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If you are going to time how long it's been running, could you not put the switch in line with the + feed out the back of the switch to kill the motor after X seconds? If it's inside the console it should last a bit longer.

Alternatively replace your off / on switch with a pusbutton? I'm now getting to the perimiter of my knowledge here, but there are timer chips out there (555 series?) where the time is set by a resistor across two pins. That could be used to drive a solid state switch & be encapsulated. All you would need is a continuous + V in, and a "go" signal (e.g. from a non latching pushbutton). IF you hear the pump cavitating, push again for off. Wire the whole lot in parallel with your current switch so you have a manual override.

All you need now is an electronics expert to design the circuit!
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Old 09 October 2009, 12:44   #9
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If you are going to time how long it's been running, could you not put the switch in line with the + feed out the back of the switch to kill the motor after X seconds? If it's inside the console it should last a bit longer.

Alternatively replace your off / on switch with a pusbutton? I'm now getting to the perimiter of my knowledge here, but there are timer chips out there (555 series?) where the time is set by a resistor across two pins. That could be used to drive a solid state switch & be encapsulated. All you would need is a continuous + V in, and a "go" signal (e.g. from a non latching pushbutton). IF you hear the pump cavitating, push again for off. Wire the whole lot in parallel with your current switch so you have a manual override.

All you need now is an electronics expert to design the circuit!
Cheers Ralph,

But I think i've sussed it-


http://www.amperite.com/documents/ST1D.pdf


keep an eye out for fires down the you know where....
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Old 09 October 2009, 16:47   #10
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Mr wet, the spec suggests a voltage drop of about 2.5v @ 3 amps. Will your pump be ok running on about 10v? Just a wee thought.
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