Can someone tell me why 10.50 volts are set in vibration transducer(e.g Bently nevada Proximitor)?

Question

Please give me answer in much detail as u can, and why the supply of proximitor is -24 volts , why not positive?

Answer 1

11.5 V is the useful voltage output of of a lead acid 'battery' under a fair load or when it is 90% discharged and under a light load--and usually this would be 'regulated down to 10.5v for actual use----

when one designs 'electronics' one designs to limits,  set by internal conditions (the components one decides to use, etc) and external conditions (expected ambient temperature, power source, sensor requirements etc)

historically 12V was the 'cheapest' commonest energy storage source (legacy design)

the +V   0V   -V  story comes about by convenience.

"conventionally"   output drive (actuator) power would be put arbitrarily 'above ground'   (in some systems)

and input power (instruments, sensors) would be 'below ground'--------------(arbitrarily vice versa in other systems, it depended primarily on which country you were in)

this convention made it quick and simple to determine on a measurement of a remote wire if you were dealing with the 'inputs' or resultant 'outputs'

hope this ramble makes sense to u