I have an ECUmaster CAN to EGT mounted on top of my gearbox monitoring 4 x egts on the engine.
I have 2x 34 pin Delphi bulkhead connectors also mounted on the gearbox to quickly disconnect the engine loom from the rest of the body wiring, to aid engine/box removal. These connectors use sicma 1.5 pins
Im wanting to add an additional 4 thermocouples to monitor additional temps on the body side of the car.
Will it be OK passing these through the bulkhead connector? The values these will be ready will be pretty low 50 to 100deg C
To pass thermocouples properly you’ll need to use Alumel and Chromel contacts.
They do exist for size 20 and 22 contacts, last time I purchased any they were $20 usd each. I don’t believe they exist for Sicma terminals.
When you crimp Alumel and Chromel to a copper terminal, that becomes a thermocouple and the ‘cold junction’. The measuring device usually has cold junction compensation inside of it right near where the point of termination is. If you have a cold junction a distance away with no sensor to compensate for the difference, the data will be garbage.
As it happens the the EGT to CAN box is literally 100mm from the bulkhead connectors. The cable run from the bulkhead to the EGT terminals will be no more than 200mm and the temp will be pretty much identical so that could work