Exhaust Temperature Sensor NMEA 2000

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CURIOUS2

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I want to fit an exhaust temperature sensor to the rubber exhaust hose just outboard of the Volvo D3 exhaust elbow. All the usual alarm manufacturers NASA etc require a cable run to a dedicated alarm box positioned at the helm.
Does anyone know of a sensor that can transmit via the NMEA backbone with the information appearing on my Simrad MFD. This would eliminate a cable run from engine room to the helm and eliminate another instrument on the dashboard.
 
CURIOUS2 said:
I want to fit an exhaust temperature sensor to the rubber exhaust hose just outboard of the Volvo D3 exhaust elbow. All the usual alarm manufacturers NASA etc require a cable run to a dedicated alarm box positioned at the helm.
Does anyone know of a sensor that can transmit via the NMEA backbone with the information appearing on my Simrad MFD. This would eliminate a cable run from engine room to the helm and eliminate another instrument on the dashboard.
Click to expand...
Would this work for you?

Exhaust Gas Temperature Sensor for NMEA 2000 (yachtd.com)
 
OP wants something that is not EGT Pete, further Yacht Devices one is EGT but wont present data on the N2K bus devices (multidisplays/plotters) as it's using (most likely) custom sentences for EGT.
NMEA2000 org in their infinite wisdom HAVEN'T got a temp value for exhaust gasses that goes over 350C or so, so it's useless, need to employ custom PGNs for that.

Back to OP request, assuming do do manage to get some black box that converts a simple temp sensor to NMEA2000 PGN, that must be configurable into something like livewell, or cabin temp or whatever in order to get the plotter to show it. Obvs you need NMEA2K bus cable in the e/r.
In short, the answer is no, you got to go custom imho. And if you do, I'd suggest you don't go for exhaust hose but go for:
  • EGT to know what your engine is doing (lots of discussion on that over the years)
  • seawater pressure to know that there is water coming in from the strainer (else pressure is low/zero) and that the exhaust is not blocked (in which case pressure is high)

V.
 
vas said:
OP wants something that is not EGT Pete, further Yacht Devices one is EGT but wont present data on the N2K bus devices (multidisplays/plotters) as it's using (most likely) custom sentences for EGT.
NMEA2000 org in their infinite wisdom HAVEN'T got a temp value for exhaust gasses that goes over 350C or so, so it's useless, need to employ custom PGNs for that.

Back to OP request, assuming do do manage to get some black box that converts a simple temp sensor to NMEA2000 PGN, that must be configurable into something like livewell, or cabin temp or whatever in order to get the plotter to show it. Obvs you need NMEA2K bus cable in the e/r.
In short, the answer is no, you got to go custom imho. And if you do, I'd suggest you don't go for exhaust hose but go for:
  • EGT to know what your engine is doing (lots of discussion on that over the years)
  • seawater pressure to know that there is water coming in from the strainer (else pressure is low/zero) and that the exhaust is not blocked (in which case pressure is high)

V.
Click to expand...
Sorry, I misread it and assumed EGT.

However, I believe the Yachts Devices sensors do output NMEA2000 and plug straight into a SeaTalk NG backbone for instance.

Digital Thermometer for NMEA 2000 (yachtd.com)

"The Device is supplied with SeaTalk NG (YDTC-13R, see Picture 2) and NMEA 2000 Micro Male connectors (YDTC-13N), making it possible to connect it to networks of different manufacturers without any adapters. The Device model is shown on the case. "
 
didn't argue against that Pete, yes it will physically connect and the net backbone will "accept" and "let" the PGNs travel (that's obvious as it's CAN protocol, follow the rules, dump whatever you like in it, it will work). Now go and ask them WHERE you can view the EGT data and come and tell us...
answer will be rather vague as is their docs. NMEA2000 protocol hasn't got EGT defined properly, sorted it lately but in the meantime everyone and their dog got a custom PGN to get their h/w going and end up use it in their own h/w (see maretron fe)
Garmin ignores it completely (I guess due to the fact that they don't produce their own meters).

V.
 
Hadnt realised the NMEA 2000 solution was such a minefield. Looks like the cheap and nasty looking NASA is the only solution for reading the temp in the rubber exhaust hose. I used to have a Halyard Marine seawater flow sensor in the seawater inlet hose which worked well if a plastic bag etc blocked the inlet, but they no longer make them
 
vas said:
didn't argue against that Pete, yes it will physically connect and the net backbone will "accept" and "let" the PGNs travel (that's obvious as it's CAN protocol, follow the rules, dump whatever you like in it, it will work). Now go and ask them WHERE you can view the EGT data and come and tell us...
answer will be rather vague as is their docs. NMEA2000 protocol hasn't got EGT defined properly, sorted it lately but in the meantime everyone and their dog got a custom PGN to get their h/w going and end up use it in their own h/w (see maretron fe)
Garmin ignores it completely (I guess due to the fact that they don't produce their own meters).

V.
Click to expand...
It's a fudge but can't you display EGT on a plotter as "Air Temperature", which is commonly supported?
 
lots of air temps supported by NMEA2K, problem is you most likely need two on a mobo, and you need to somehow get your plotter to show them in a decent format.
Except if you ignore formating and just want the warnings coming through the N2K bus.
tbh it's useful to be able to monitor them on a normal run. It's another useful bit of info in terms of understanding how the engine is performing and what may be wrong. It's a v.good indication of load (which I don't have in my mech IVECOs and the yanmar2GMF geny engine. Nevertheless, I immediately know if the geny is stressed by the EGT temp. Watermaker on and a bit of topping up batteries with 27C water means EGT is at the 230C, just charging, or testing STAR operation of the stabs, temps wont reach 180...
 
I used 'engine room' temp as my format for a sensor on my thrust bearing. It was the closest I could get when there was no proprietary PGN for the temp I was interested in.
 
for the record that's I think the latest list of N2K supported non engine specific temp types:
SeaTemperature
OutsideTemperature
InsideTemperature
EngineRoomTemperature
MainCabinTemperature
LiveWellTemperature
BaitWellTemperature
RefridgerationTemperature
HeatingSystemTemperature
DewPointTemperature
ApparentWindChillTemperature
TheoreticalWindChillTemperature
HeatIndexTemperature
FreezerTemperature
ExhaustGasTemperature

some of them can be indexed so you can have more than one of a type

Engine specific ones (IDed for each engine) are below:
EngineOilTemp
EngineCoolantTemp
Transmission OilTemperature

(don't ask why EGT is in the first list, no idea....)
 
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