Hi - I'm struggling on how to proceed using FreeScale's MPX5050 sensors for building an Arduino-based Throttle Body Sensor (TBS) for BMW motorcycles. Briefly, a TBS measures the vacuum created by the engine's throttles so that a mechanic can tune/balance the bike's throttles to create equal vacuums during acceleration. A fluid-based manometered TBS is demoed here. Wouldn't a solid state unit be so much better?
While it would be possible to use one (1) MPXV5050VC6T1CT-ND sensors to measure the vacuum of each cyclinder, it would seem more practical to use a dual port MPX such as the MPX7025 series to handle 2 cylinders. So three questions:
1. Does Freescale make a sensor that measures from -50kPa to +50kPa with a 0kPa out at 2.5v? I still need to confirm further but a throttle might create a -50kPa.
2. Is the media resistant gel the only difference between the MPVZ7025DP and the MPXV7025DP? If a motorcycle shop is a greasy messy place, am I better off with a MPVZ unit?
3. In Table 2 on page 3 of the MPX7025 datasheet, there's a maximum pressure for P1 of 200kPa. Is there a maximum pressure for P2? In other words, at what point would I damage this sensor if a bike's cyclinder were to draw X kPa from the P2 port? Is this also 200kPa (or -200kPA on P1)?
Thank you so much.