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B260 temperature sensor fix

Old 06-01-2016, 05:27 AM
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Default B260 temperature sensor fix

My B260 temp thermistor went open circuit.

I had a sensor made to fit into the tee above my Perko 2 inch sea cock.

http://www.temperature.com.au/

ask for Phil and request Ralphs fix as installed on WIDGEON.

PS I had Phil supply a thermowell which guaranteed isolation from seawater intrusion when sensor removed, this introduces a 12 second delay in detecting temperature change but provides piece of mind for moored vessels.

My profession is Industrial Instrumentation, ive checked the install against precision Thermometers and its spot on down to 2 decimal places.

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Thermistor probe.

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Thermowell.

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Thermistor & Therowell in SS 316 2 inch to 1/2 inch NPT reducer.


Regards
Ralph
Old 06-01-2016, 07:38 PM
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Ok I'm curious... Where can I get one? I have a sea chest with tons of sea cocks I could use... Awesome idea.
Old 06-01-2016, 08:48 PM
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There is an easier and less expensive way of making the same temp sensor. Using the water intake supply for reading the temp has been around for a long time.
Old 06-02-2016, 04:22 AM
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You need to fill the thermowell with oil. This will reduce the temperature transfer hysteresis time.
Old 06-02-2016, 04:40 AM
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Originally Posted by Lead Change View Post
Ok I'm curious... Where can I get one? I have a sea chest with tons of sea cocks I could use... Awesome idea.
For the temperatures involved a cheap multi meter with a K coefficient thermocouple will work fine. Fit in thermowell and fill with oil like glycerine which has good thermal heat transfer.
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Old 06-10-2016, 05:51 PM
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Originally Posted by Lead Change View Post
Ok I'm curious... Where can I get one? I have a sea chest with tons of sea cocks I could use... Awesome idea.
Temperature Controls, use the link in my original post and make contact with Phil.
Old 06-10-2016, 05:55 PM
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Originally Posted by isitstuffed View Post
You need to fill the thermowell with oil. This will reduce the temperature transfer hysteresis time.
Yeh Phil supplies a tube of heat transfer compound which I used. On water testing showed delay is much less than the expected 12 sec, more like only 4.

Last edited by tuna_man; 06-10-2016 at 06:07 PM. Reason: Fix typos
Old 06-10-2016, 06:01 PM
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Originally Posted by isitstuffed View Post
For the temperatures involved a cheap multi meter with a K coefficient thermocouple will work fine. Fit in thermowell and fill with oil like glycerine which has good thermal heat transfer.
Yes I've done the multimeter thing, not very practical though.
I spliced the probe into the B260 cable so temp appears on my NND3D MFD12 screen as per original setup.

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