Exhaust alarm

Well, I have a Vetus exhaust alarm which was simplicity itself to fit. Just drill a small hole in the waterlock, a little bit of wiring and hey presto, it works. Very easy to test by just bridging the two spade connectors. I also have a Halyard Sea Strainer alarm that detects water inlet blockages (or when I forget to open the seacock). And also have the engine overheat alarm. I have an engine room (sounds grand eh?) extractor fan which I run when the engine is running. Any overheating part of the engine is soon smelt and can be investigated. Am I paranoid?
 
If I remember correctly it used one of the Velleman kits - it did as I knew I had one here in my "must get around to it" box so dug it out - Velleman Mini kit MK138, I bought mine from Spiratronics with their part number TW2-440
 
I fitted the Nasa EX1 this year, great bit of kit, digital display of temperature and audible alarm, with adjustable threshold as well, a bit pricey but simple to fit (they even supply the correct drill to fit the probe in the exhaust hose) Very happy with it.
 
I went for the Vetus sensor, preferring a sensor that was mounted through the exhaust hose rather than one that would have been insulated from the exhaust gases by the thickness of the exhaust hose as some are.
extra wiring and display....no.... since the existing MD2040 coolant sensor goes short circuit (closed) when over temperature and the same happens with the Vetus sensor I just wired this new sensor in parallel with the existing. 18" piece of wire was all that was needed.
Buzzer sounds and panel light in cockpit would be lit if either sensor closes due to over temperature...
 
Like "nigelmercier" we went down the DIY route. Bought these (http://www.ebay.co.uk/itm/INDOOR-OU...pt=UK_Kitchen_Accessories&hash=item3cb00de148) . I connected the remote temperature probe to the exhaust, it is held against the outside of the exhaust with a jubilee clip, at the spot where inside the exhaust, the engine cooling water is being sprayed. Trial and error showed that this spot is at about 25 deg C with the engine running - rising to 40 deg with several hours running as the engine compartment warms. If I turn off the inlet seacock - the temperature climbs instantly and the alarm sounds in 10 seconds or so. I have the display in the cockpit. 2 years, still working, has it's own battery. At £4 each it is virtually a throwaway item.
 
nigelmercier said:
I bought one of these:

http://www.ebay.co.uk/itm/300876336437

Haven't fitted it yet.
Click to expand...
I fitted one of these, coupled to a buzzer. Good bit of kit at bargain price once you've worked out how to set it up.
The thermistor is clipped to the exhaust bend, runs at about 30 deg. and seems to respond quickly to cooling water loss.
Only complaint is that it very occasionally forgets its alarm setting, giving a false alarm shortly after starting the engine.
No idea why this happens, but resetting takes only moments.
 
earlybird said:
I fitted one of these, coupled to a buzzer. Good bit of kit at bargain price once you've worked out how to set it up.
The thermistor is clipped to the exhaust bend, runs at about 30 deg. and seems to respond quickly to cooling water loss.
Only complaint is that it very occasionally forgets its alarm setting, giving a false alarm shortly after starting the engine.
No idea why this happens, but resetting takes only moments.
Click to expand...

+1 and been v. happy with it. I haven't come across the occasional amnesia feature yet, but I'll keep an eye on it.
 
When fitting a Vetus sensor through the exhaust pipe how to be sure it is gas and waterproof,how do you wire it to make it working when switching the engine on.Thanks
 
The sender has all the necessary bits to do this. Looking at the diagram, it does look as though you'll need access to the inside of the hose: http://www.vetus-shop.com/vetus-sensor-for-exhaust-temperature-alarm-to-fit-exhaust-hose-p-659.html

As for the wiring, just take the 12v+ from the "ignition" switch so it's on when the "ignition" is on and off when it's off. This may be a key switch like in a car, though not necessarily, but it's very likely to be near the warning lights (oil pressure, water temp or charge). If you aren't sure which terminal, trace the wire back from one of the warning lights. If it disappears into a load of electronic gubbins, look for a wire from the gubbins to the switch.

The negative is connected anywhere where the current can find its way directly back to the negative battery terminal.
 
Many thanks for your reply,is the alarm display waterproof and be fitted in the cockpit and how does it warn :light buzzer?
 
You can use one of these £2.39 temperature switches http://cpc.farnell.com/microtherm/0...l-switch-n-o-30c/dp/SN35838?in_merch=Products mounted on the exhaust elbow with a blob of CPU heat sink conductive paste, just wire it up to a low voltage buzzer and when it reaches temperature the contacts close and it will sound the buzzer. They are available with different temperature ranges.
I use one as a sensor on my battery charger which is in a locker, when the charger heat sink gets warm it closes the contacts on the switch to turn on a computer cooling fan to vent the locker.

Whole job could be done for less than a tenner.
 
Exhaust temp alarm. Excess water prevents exhaust from exceeding 100 degees.
If you attach an NC sensor -normally closed (I found one in old coffee jug) then it can be wired fail safe ie alarm hoots if wire comes off and if temp goes high.
 
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