Replacement raw water alarm or sensor

[pcatterall]

Our little alarm was fine until the exhaust elbow above the sensor decided to leak and shorted it out causing some alarm to the crew as it happened (as usual) at the wrong time.
The leak is now resolved but the alarm will not work ( or, rather, will not stop working !!)
It is one of those where the detector just straps onto the raw water pipe and I wonder if we can just get a new sensor or if we have to replace it all ( suggestions welcome please)

I was able to fit a raw water gauge and this seems to work well reading around 70 degrees at cruising revs. In some ways the gauge is better than the alarm as you can keep an eye on
the temp at all times. Having an actual alarm, though, does have the advantage of waking up the helmsperson and would be nice. I believe that I could just add a small alarm ( and possibly a flashing red light) to my gauge? next time i'm on board I will photo the back of the gauge in case one of you experts can tell me how to wire it.

Any general advice welcome.

 

[alahol2]

I fitted something like this last year... https://www.ebay.co.uk/itm/12-24-220V-STC-1000-Digital-Temperature-Controller-Temp-Sensor-Thermostat-Contro/163309682985?hash=item2606040129:m:muucCSlRz28LK9JTjIjJb8Q

Temperature permanently displayed. The alarm temperature is fully adjustable (if you can read chinglish). Added a little 'screech' alarm across the 'cooling' terminals (could also power LED flasher). Powered from 'run' terminal on ignition switch. Sensor jubilee clipped to exhaust elbow after water injection point.
A bit of trial and error to get the correct temperature alarm setting, I think ours is now set to about 55C, I guess it depends on precisely where you place the sensor.
Cheep and cheerful but it works.

 

[Poey50]

I fitted something like this last year... https://www.ebay.co.uk/itm/12-24-220V-STC-1000-Digital-Temperature-Controller-Temp-Sensor-Thermostat-Contro/163309682985?hash=item2606040129:m:muucCSlRz28LK9JTjIjJb8Q

Temperature permanently displayed. The alarm temperature is fully adjustable (if you can read chinglish). Added a little 'screech' alarm across the 'cooling' terminals (could also power LED flasher). Powered from 'run' terminal on ignition switch. Sensor jubilee clipped to exhaust elbow after water injection point.
A bit of trial and error to get the correct temperature alarm setting, I think ours is now set to about 55C, I guess it depends on precisely where you place the sensor.
Cheep and cheerful but it works.

I've got exactly the same ... works a treat.

 

[Plum]

I fitted something like this last year... https://www.ebay.co.uk/itm/12-24-220V-STC-1000-Digital-Temperature-Controller-Temp-Sensor-Thermostat-Contro/163309682985?hash=item2606040129:m:muucCSlRz28LK9JTjIjJb8Q

Temperature permanently displayed. The alarm temperature is fully adjustable (if you can read chinglish). Added a little 'screech' alarm across the 'cooling' terminals (could also power LED flasher). Powered from 'run' terminal on ignition switch. Sensor jubilee clipped to exhaust elbow after water injection point.
A bit of trial and error to get the correct temperature alarm setting, I think ours is now set to about 55C, I guess it depends on precisely where you place the sensor.
Cheep and cheerful but it works.

+1 fitted one of those 4 years ago. Excellent. Note the temperature you get when using full power and set the alarm to 10 degrees higher.

Www.solocoastalsailing.co.uk

 

[BabaYaga]

I was able to fit a raw water gauge and this seems to work well reading around 70 degrees at cruising revs. In some ways the gauge is better than the alarm as you can keep an eye on
the temp at all times. Having an actual alarm, though, does have the advantage of waking up the helmsperson and would be nice.

One option could be to keep the gauge and complement it with an independent bi-metal thermostat switch. I have one of those strapped to the exhaust bend, just after the raw water injection pipe. NO, from memory closes at 80 degrees.
The switch is wired in parallel with the normal engine temperature alarm, thus makes use of the buzzer already present in the engine control panel.

 

[pcatterall]

Thanks all. The gizzmo sounds like the one I installed I willl se if I can identify the terminal reffered to and see if I can wire in the redundant alarm from the defunct device.