Raymarine temperature offset

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Jamesuk

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Ok so we have the ST290 display, we are unable to calibrate the temperature through the Transducer general offset page in the user menu.

If anyone is on board there boat and has the ST290, can you check to see if you can adjust the temperature? Our reading is about 5 degrees C out (reading high). The chap next door is lower but also reading high.

Cheers

James

Also check the version if you have not updated since 2003 then great but post 2008 units i expect will also mot Llow a change to be made.
 
Jamesuk said:
Ok so we have the ST290 display, we are unable to calibrate the temperature through the Transducer general offset page in the user menu.

If anyone is on board there boat and has the ST290, can you check to see if you can adjust the temperature? Our reading is about 5 degrees C out (reading high). The chap next door is lower but also reading high.

Cheers

James

Also check the version if you have not updated since 2003 then great but post 2008 units i expect will also mot Llow a change to be made.
Click to expand...
It is possible that the log impeller where the seawater temperature is measured is faulty: mine stopped reading temp about 5 years ago, this caused other problems to all Seatalk instruments, and instead of buying a new log impeller at £150+ and mucho hassle routing new wiring, a 10 pence resistor was wired in to fool the system into thinking the faulty sensor was OK. I now have a seawater temperature of a balmy 25 degrees C wherever I go. The temp sensor going but the log still working is a pretty common fault and the cheap fix is also quite well known.
 
AngusMcDoon said:
For B&G, Raymarine and Garmin it is just for display. I imagine the other manufacturers are similar.
Click to expand...

Good! My ST60 always shows 45C. My colleague thought this would affect the depth reading because of speed of sound variation compensation. I don't know if it would be a significant effect anyway.
 
When the thermistor in the paddle-wheel transducer failed o/c, my ST60 Tri-data reverted to repeater mode on the speed section. The solution is, as above, a resistor across the instrument terminals.
the Raymarine web-site gives a list of resistance values v. temp. reading. The Scottish waters I sail in appear to be permanently at 25 deg. C.
 
Troubadour said:
Good! My ST60 always shows 45C. My colleague thought this would affect the depth reading because of speed of sound variation compensation. I don't know if it would be a significant effect anyway.
Click to expand...

The density, and hence sonic velocity, of water changes very little in the temperature range we sail our boats in, so it is not worth it. The inaccuracy from this unaccounted for variable is far less than the general inaccuracy of the instrument anyway.
 
earlybird said:
When the thermistor in the paddle-wheel transducer failed o/c, my ST60 Tri-data reverted to repeater mode on the speed section. The solution is, as above, a resistor across the instrument terminals.
Click to expand...

That's very interesting. My ST60 speed has occasionally reverted to SoG, and I have never noticed it displaying a valid temperature (though that's not something I'd often look at anyway) so perhaps is the cause. Would be good if so, as otherwise I'm resigned to digging out all the well-buried wiring.

Can anyone point to more details on which terminals to bridge and with what resistor? I don't plan to go detecting the Gulf Stream (only use for sea temperature I can think of) any time soon.

Pete
 
prv said:
That's very interesting. My ST60 speed has occasionally reverted to SoG, and I have never noticed it displaying a valid temperature (though that's not something I'd often look at anyway) so perhaps is the cause. Would be good if so, as otherwise I'm resigned to digging out all the well-buried wiring.

Can anyone point to more details on which terminals to bridge and with what resistor? I don't plan to go detecting the Gulf Stream (only use for sea temperature I can think of) any time soon.

Pete
Click to expand...

Just found this http://www.raymarine.co.uk/knowledgebase/index.cfm?view=3791
Will be having a look at the weekend! With a 16k-ish resistor handy.
 
"Regarding the Sea Temperature adjustment, I downgraded my Speed pod from v4.02 to v3.00 and still could not add an adjustment. This feature has obviously not worked for some time, presuming it was ever implemented at all in the ST290 system."

This means a software feature which was live in 2003, has since been removed since the last two updates to the system were introduced.
 
I must have been lucky since my ST60 log is still giving sensible readings after 13 years. It may not be completely accurate but acts as a good guide to whether SWMBO will want to swim or not.
 
jwilson said:
It is possible that the log impeller where the seawater temperature is measured is faulty: mine stopped reading temp about 5 years ago, this caused other problems to all Seatalk instruments, and instead of buying a new log impeller at £150+ and mucho hassle routing new wiring, a 10 pence resistor was wired in to fool the system into thinking the faulty sensor was OK. I now have a seawater temperature of a balmy 25 degrees C wherever I go. The temp sensor going but the log still working is a pretty common fault and the cheap fix is also quite well known.
Click to expand...
Hi my st60+ Tridata temp has never worked correctly but I assume that is the transducer which was older than the new st60 but I do find that the speed seems to vary, I set it correctly to my walker log and sog is it possible that the malfunction of the temp transducer could cause this, if so please could you give more details of fitting a resistor.
Regards Mike
 
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