Damaged Battery Temperature Sensing Unit

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Damaged Battery Temperature Sensing Unit

Postby RJRsolar on Sat Mar 04, 2017 11:45 am

The "phone plug" accidentally pulled off the temperature monitor cable.(My boo-boo.)

What is the pin connections to the plug? I can replace it.

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Re: Damaged Battery Temperature Sensing Unit

Postby Mike Curran on Sat Mar 04, 2017 6:44 pm

Based on this thread: viewtopic.php?f=17&t=8414&p=47543&hilit=RTS#p47543 it sounds like the RTS is just a thermistor so it should be only two conductors and polarity won't matter. I say "should be" because I haven't examined the plug/number of conductors on my own RTS.
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Re: Damaged Battery Temperature Sensing Unit

Postby Vic on Sun Mar 05, 2017 2:24 pm

YES, Mike is correct, the Sensor is simply a 10 K NTC Thermistor -- temperature-variable resistor.

In the OB RTS cables that I've seen (dark green ones), the Red and Green wires in the cable are connected together, as are the Black and Yellow ones, at the Thermistor. The OB hardware looks for a resistance change twix these two pairs of wires (by running a small current through the Thermistor, and looking for a voltage change vs temperature change)

At room temperature, the Thermistor should read close to 10 K Ohms.

The sequence of the wires from one side of the four-pin cable connector is, Yellow - Green - Red - Black. And, it should not make a difference which side of the connector that you start the above sequence, there is no polarity required, as the RTS is just a resistor.

IMO, FWIW, Good Luck, Vic
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