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Connected the power supply, set to 12V. Connected negative to ground on lab jack + ground on sensor. while positive was connected to Sensor 9-12V input. connected out to AIN0 on LabJack, connected Temp to AIN1 on LabJack.
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Next I tested the Carbon tubes with DB-9 cables in them. This was done by connecting the sensor end to the cables mounted to one of the good sensors. The other end was connected to a DB-9 test stand which in turn was connected to power and the LabJack.
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All the tubes seems to work correctly!