SV EMS MAP info in .DFG file

[jdubner]

Please explain why the standard SkyView .DFG file for a Lycoming 4-cylinder engine's MAP sensor seems to indicate a range of 0 - 19.6439 PSI.  My gauge indicates much higher than that of course -- perhaps 0 - 40 PSI.  Is there some sort of conversion going on?

The applicable entry in the file starts out:

      c37_p26={
            valid=1
            name=MAP
            id=100434-000
            alarm_type=OFF
            range={
                  max_display=19.6439
                  min_display=0
                  range1_valid=1
                  range1_top=17.6795
                  range1_bot=0
                  range1_name=R1
                  range1_color=GREEN
                  range2_valid=1
                  range2_top=18.6617
                  range2_bot=17.6795
                  range2_name=R2
                  range2_color=YELLOW

I'm pretty sure this is the entry that's used in my installation (pin 26 of the 37-pin connector).

Thanks,
Joe

 

[dynonsupport]

If you're reading 40 PSI, you're flying something from WWII or Reno!

Your gauge is in inches of mercury, not PSI. PSI is about 1/2 of inHg. All settings in the sensor file are in PSI and the system converts to inHg for the gauges where it is appropriate.

 

[jdubner]

D'oh!

Yes, that makes sense and the numbers seem reasonable now that I find 1 PSI == 2.036021 in Hg. So the 19.6439 value converts to about 40 inches, which is about what the gauge tops out at.

Thanks.

--
Joe