Exhaust Overheat Alarm?

I did a search but didn't see anything on the forum.
Anybody have a temp sensor on the exhaust hose? experiences? advice?

I like the look of this one better than some others.
http://www.borelmfg.com/products_alarm.htm

I am in the middle of rebuilding (read replacing) my entire exhaust system; mixing elbow, hose, ext, except for the Vernalift and the through hull fitting. I am doing a bit of re-design because the factory spillover point at the mixing elbow is only four inches above water line...... and it could easily be more. (more = better)

Anyhow, I'm thinking I might as well add a exhaust temp sensor/alarm while I'm in there. I hate to think of the day when I motor out of the slip with the raw water seacock closed, but it could happen in a thoughtless moment. I'm not after-all totally immune to spontaneous and intermittent lapses of rational thought process.
I'm kind of a belt and suspenders kind of guy anyhow.

Alarming ideas

Lots of search hits here about the engine temp. alarm but not so much about adding one. I found this discussion:
http://www.ericsonyachts.org/infoex...arm-M25-where-to-put-the-switch&referrerid=28

Loren

Keep your key looped around the raw water seacock handle when not in use.

It looks like the alarm trips at 167F. My Yanmar manual states the stock temperature alarm trips at 193F. I wonder how hot your engine needs to be to cause damage?

Mark

I don't want anything getting so hot it could cause a burn if touched. Damage I would think is not a problem until you get near 200 degrees.
I think maybe the real question is what is my normal operating exhaust temperature, it isn't too high because as of yet nothing gets very hot down there.
I want to be notified when I leave the realm of normal though.
I thought about getting a digital display gauge or something but I think a dummy signal is probably sufficient in conjunction with the engine temp gauge.

Storing the key near the intake is genius! Why don't I think of things like that!

Exhaust temp

My exhaust temp sensor is on top of the mixing elbow. I think it was the same on my E30+.
Harold

Exhaust Overheat alarm

I installed an aftermarket alarm from Borel Mfg; about $60 if I remember correctly. The sensor straps onto the exhaust hose just after the raw water injection point (about 2"). It senses post inject exhaust temp of more than 165F and sounds an alarm. Inject water comes from the heat exchanger so it is an early alert to raw water failure. Easy install and "automatic" operation.

It is possible to make an alarm for a few quid/bucks. A 90 degree ( Centigrade) normaly open thermal switch and a piezo Alarm can be bought on ebay for a under 6 of our uk pounds. (I guess 10 dollars ish)

There are different temperature switches available if 90 does not suit, or, two could be fitted one to a warning light to warn that things are getting warm and one to an alarm to warn that its going to start costing money unless something is done! I fitted mine by tucking one leg of the switch under the rubber exhaust pipe where it connects to the mixer and a stainless clip around the other leg.

Ian

I ordered the Boreal temp alarm. It came to the doorstep in just three days, and it looks like a quality product. I'll post more when I get it installed and tested for function.