Re: 48-50 Bimetal Senders Retrofit Project

Posted by DavidPackard On 2024/5/3 16:53:11

HPH

The data applies to the temperature gauge only. I was trying to get more than 3 calibration points, so I estimated a 10-point scheme. Zero is COLD, 100 is HOT.

The nonlinear characteristic may be the age of the test article alone. I could be a bit of roughness in the 'normal operating' positions.

Howard

I believe the gauge will function OK with steady state current levels, albeit lower than the peak value in the pulse width modulated scheme. I'm trying to hold the bimetal at a particular temperature, and I can get there with a steady heat input, or on/off cycles of, when on, excessive heat input . . . much like heating a home in the mild weather.

IIRC doesn’t the service data indicate that a fuel sending unit may be used to trouble-shoot either the fuel level or coolant temperature instruments? If my memory hasn’t turned to mush it would then be a question of resistor values and calibration. I’ll sign-up for if I ever have my fuel tank removed I will repeat the ‘fixed resistor’ test on that instrument.

dp