At 10:56 PM 3/11/2010, Max Wellhouse wrote: >I guess my questions go like this: >1. Are there problems soldering extension wires to get the plug to >reach,or do I find a sensor with wire long enough to get the job >done? Can I use copper wire or does it ned to be that silver core >stuff like is on the new and old sensor? > >2. Is a full ohm of resistance acceptable or is that part of the "problem"? Dear Max, Interesting questions. I wish I had better answers. 1) The "use your existing wire" sensors from Bosch and NGK come with crimp connectors for the leads. I would not expect soldering to pose a problem, although from your description of the sensor wire it's possible there might be. When you say silver, do you mean actual silver? Silver-plated? Tinned? Tin-plated? Solid/stranded/woven/insulated-strand woven (Litz)? I suspect that it's stranded copper, either tinned or tin-plated, and if so I wouldn't expect a problem using copper to extend it -- I don't see a reason for them to use anything exotic. However I don't know enough about thermoelectricity, and the danger I see is creating a thermocouple whose output could swamp the sensor output. I'd suggest telephoning Bosch NA and try to talk to an applications engineer. That may not be possible, but I was once able to talk directly to a knowledgeable engineer at BASF Chemicals straight from the main company switchboard, so it's worth a try (He told me, incidentally, that BASF make the VW house brand antifreeze and did not understand why VW wanted it phosphate-free, but that's what the customer ordered and BASF was happy enough to make it for them). 2) This is a high-impedance circuit and wouldn't notice an ohm -- or ten ohms, or a hundred. However it's a very unusual wire indeed that would have an ohm in a couple feet, so if you're confident of the measurement I'm led to think of either something rather exotic or more likely a damaged/corroded wire. If the resistance measures different in opposite directions then you've definitely got some interaction going between meter/probes/wire that either has some diode effect or is actively generating voltage to screw up the resistance reading. Best I can do, sorry... d |
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