An interesting solution, but square boxes don't make very good pressure vessels.You should be able to fit the extra valve in to a small IP68-rated metal metal enclosure (or something similarly gastight) and just pump that up to the required pressure.
Yes it would somewhat.Also, wouldn't the metal case detriment the transmission signal ?
Not necessarily strain gauges in the conventional sense, but some kind of pressure sensor.inside that short tube hole there is a diaphragm which uses strain gauges to convert the pressure to a resistance and hence a voltage.
I was quoting from an article on pressure transducers I've just been reading .. ..Not necessarily strain gauges in the conventional sense, but some kind of pressure sensor.
I guess that would depend on the screw somewhat .. .. ..At its most crude, this could be by driving a screw into the hole to act on the diaphragm.
Sounds like a good way to completely bust the thing!
Just me being a bit picky with semantics, when strain gauges are mentioned I always think of things like this:I was quoting from an article on pressure transducers I've just been reading .. ..
Yes Alec .. I think that is more or less where I'm likely to end up with this … .. .. . although the size of the whole thing suggests to me the distance between 0psi and 40psi at the transducer is probably no more than a bee's knee, so that may be easier said than done. Also, the sensors work out at £40 a piece so a slip would be costly.If I were doing this I'd try to find a blunt-ended non-metallic rod (cocktail-stick?) to fit the sensor aperture and apply gentle finger pressure to deflect the transducer and see whether that fools the monitor. If it does, then a more permanent screw-adjustable pressure applicator could be rigged up.
Indeed they do and this one was sacrificed for our education. The cell powering this TPMS sensor is a CR2450A, which is a 3V cell, but only reads 2.32V now. I do not know how old this sensor is, but it came from a Lexus LS460.They get their power from a coin cell - if you look at the picture in post #1 you can clearly see the RH end of the sensor is almost circular .. .. allegedly lasts for 10 years !
From other reading that I have been doing on these things, I think the pressure sensing element is some kind of piezo-electric device which produces a voltage when it is subjected to pressure.there is no orifice to any kind of sensing element.