Exhaust temps

Pleinmont said:
Interesting (y)
Does anyone have any product recommendations for the exhaust alarms that do not need drilling (external sensor on the elbow)?
Click to expand...

Just use these as suggested by some one earlier in this thread.

110-220V LCD Digital Temperature Controller Thermostat with Sensor STC-1000 | eBay


I have the single one installed on our sailing boat and it cost less than 10 pounds and the senor can just be attached (I used a cable tie) against the metal exhaust bend / riser. I tested it a couple of weekends ago when we went to Bembridge under motor both ways and it seemed to work well.

I have a double one ready to install on our Mobo

DC12V STC-3008 LED Dual Digital Temperature Sensor Thermostat Controller Display | eBay
 
BruceK said:
When I drilled a 4mm hole in the exhaust riser bellows the hole almost sealed itself when pulling out the drill. Shoving the sensor in was a satisfyingly tight fit. Remember these are service items that need regular replacement. Having done it myself I have no qualms about the integrity of the installation or any perceived danger should they fall out. The resulting hole in the rubber is about 1mm and about 3 inches above the waterline. should it ever leak it will be by drop rather than dribble
Click to expand...

I'm sure it wont sink the boat if it fails. It just seems wrong to me, drilling a hole in an expensive pipe containing stuff that shouldn't be in the boat (not only water, but gas as well). Also, I suspect they only need regular replacement if they in the water flow - the original ones I have strapped on the pipes are 15 years old.
If I didn't have an alternative I'd probably go that route, but a sensor on the metal exhaust bend is likely to be almost as fast in its temp response I suspect.
 
dragoon said:
Just use these as suggested by some one earlier in this thread.

110-220V LCD Digital Temperature Controller Thermostat with Sensor STC-1000 | eBay


I have the single one installed on our sailing boat and it cost less than 10 pounds and the senor can just be attached (I used a cable tie) against the metal exhaust bend / riser. I tested it a couple of weekends ago when we went to Bembridge under motor both ways and it seemed to work well.

I have a double one ready to install on our Mobo

DC12V STC-3008 LED Dual Digital Temperature Sensor Thermostat Controller Display | eBay
Click to expand...

Thanks, sorry yes I was speed reading before and missed that bit :) (y)
 
One little thing when I installed mine, the connection instructions were wrong, there was also a label on the inside of the junction box giving different connections, I contacted them and was told the junction box label was the correct way and he would change the supplied instructions.
It is as Bruce says, the sensors are a very tight and secure fit, I fitted them as per the instructions, on the top of the hose and approx 150mm downstream of the injection point.
At cruise revs mine settle at around 70-75c TAMD 71B's.
 
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Jamie Dundee said:
Fast cruise settled now at 49/50c with 55c at wot. Alarm set at 60c, panic at 70c :eek:
Click to expand...
:D As above that's your baseline. If we are going to hand out specific temps where we should all start bricking it would be about 85 - 90 C at which point the raw water flow cannot cool the coolant down and is loosing the battle for whatever reason. I am sure that a complete raw water failure would see some seriously higher temps if it was exhaust gas alone.
 
I spoke with David at Silicon Marine today who was very helpful,

He does a ring sensor (looks like a ring terminal) which can also have a strap put around it to a metal pipe, he has kindly sent me pics of it.

1623428119514.png

I also asked for some more images of the display unit including the rear of it to see how it mounts, he does 2 versions, one with wires exiting below and one out the back...I'm interested in the ones out the back...

1623428182974.png

1623428203889.png

I think I'll be adding a dual setup with the ring sensors to the metal elbows to my winter to do list...

Enjoy!

ps. The size of the monitor display is;

88mm x63mm x15mm
 
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