Temp sensor on B75H transducer

[seasick]

The Airmar B75H transducer should not be turned on when it is not in the water to avoid over heating. My question is : When the transducer is disabled using the Garmin 8616 MFD, the sonar definitely stops but does the temp sensor stop working also.

Mine does not send temp data but I was sure it did in the past. The transduced is known for temp sensor failures but I am hoping that is not the case.

 

[DennisG01]

Not sure. But you can safely have the ducer on for a short time. I wouldn't leave it on for 10 minutes (although maybe that's still fine... I don't know) but a minute or so to check what you want to check is fine. I've never ever had one go bad from being on for a couple minutes - and that's in many, many different boats.

Or, if it makes your stomach get queasy thinking of doing that... put a bag of ice on it

 

[seasick]

Not sure. But you can safely have the ducer on for a short time. I wouldn't leave it on for 10 minutes (although maybe that's still fine... I don't know) but a minute or so to check what you want to check is fine. I've never ever had one go bad from being on for a couple minutes - and that's in many, many different boats.

Or, if it makes your stomach get queasy thinking of doing that... put a bag of ice on it

The sonar function is OK. I did turn it on on land and the Gramin 8616 displayed the sonar info. The temperature didn't display but I was not able to determine if that is a MFD config issue or a bad temp sensor. Although I believe that the temp had been displaying on the sonar screen along with a few other pieces of info (COG e.g), it doesn't display now. I can't seem to add sea water temp to the screen. Is that because the config is messed up, or is it because the MFD says there is no temperature sensor so don't offer it as a display option?
I will probably have to trouble shoot the harness and transducer connections but its way too cold to be working on the boat

 

[DennisG01]

I think with that in mind, if it was me, I'd call Garmin with that info.

Is there a minimum temp needed to send info (or somewhere in the MFD "logic")? I have no idea - but obviously the temps we're seeing right now on land would never be seen in the water

 

[SkunkBoat]

So you are saying there is no Temp displayed or the Temp looks like --.- ° ?

B75 has XID
Does it identify and display the B75H as the transducer at the bottom of the sonar screen?



You can find pinouts and diagrams here https://www.airmar.com/xref

I would definitely suspect a "green" pin on the plug. If it were too cold I would expect it to be stuck at its lowest temp.

Here is the B75 garmin wiring diagram.



Usually an XID tranducer will be recognized by the Garmin and it will make all necessary Transducer setup.
If it doesn't recognize it, it has to be entered in the super double secret transducer setup menu. Garmin support can help you with that...but that B75 should plug N play.