MSefi.com read only forum (Jan.15,2018)

Does anyone know if a bosch hall effect sensor, as found on a ford sierra, is a 12v or 5v sensor? It has ..232 written on the top and that is the only visable marking without taking the distributor apart

thanks
andrew

To answer my own question its a 12V

That's been my experience with VW/Audi Bosch Hall sensors, too, every one I've checked is 12v (either by direct measurement from the sensor or by chasing the circuit diagrams to the supply).

Eric

rs2000 wrote:To answer my own question its a 12V

Yes all of my Bosch hall sensors from Vauxhall/Opel cars also have 12V suply voltage. I must mention that wiring the sensor backwards cause them to fried. I learned that hard way

I've been told by someone else its a 5V sensor.. its no trouble to use 5V, should i just go for that? If i do use 5V then i still use 12V on my pullup resistor right? Or should i just use 12V and hope its ok, everyone here seems to think bosch sensors are 12V?

The sensor probably requires a 12V supply, but probably outputs a 0V or 5V signal (to feed a 5V processor), so to be safe it might be best to first try a pullup resistor to 5V rather than 12V. I'm guessing here but I was playing with an optical cam sensor today that works as stated above.
Ian.

The hall effect sensors (I prefer switch) used on bmw motorcycles for a bosch EFI system are supplied by siemens.

They have a supply rating from something like 5 volts to over 17 volt. So they can be operated off any voltage in that range!

The output is open collector, a maximum voltage would be over 20 volts, and the maximum current is 20 milliamps. Meaning the output is lick a switch or points, but it can only withstand an open circuit voltage of 20 volts and when it is short circuit a maximum current of 20 milliamps.

More info from a different manufacture (but physically and electrically compatible) available from Honeywell; part No 2AV54 Search on www.honeywell.com/sensing/