GRT map sensor ??

[cujet]

I've got an older GRT map sensor permanently wired in to the airframe. It uses 12V instead of 5V and is wired in parallel with other 12V sensors. In other words, I'd have to run new wires to run the Dynon MAP sensor.

So, I'd like to get it working properly, if possible. I also have a spare. No part number is visible on it. It simply says

"manifold pressure sensor 5-31Hg
manufacture date 11-99
Aux SF = 141   AuxOff = 86
1=12V, 4=output, 5=ground
Grand Rapids Technologies, inc"

It shows 56 inches of MP here at sea level. And the numbers change downward as I draw a mouth vacuum on the sensor.

Thoughts? Suggestions?

Thanks!!

 

[dynonsupport]

As you can see, ever GRT MAP sensor is different, which is why they have numbers written on them. So we can't easily build support for them into the product.

If you're technical, it's totally possible to build your own sensor file to support this sender. You need to know the voltage at two known pressures (to a lot of accuracy, since you want your MAP to be accurate to 0.1 or 0.2 inHG).

Maybe you can convince GRT to give you that data based on your numbers.

Also, our input is only 5V, so if it puts out 12V you'll need to do other things.

Once you know the voltages vs pressure, we can probably help you do the sensor file.

 

[cujet]

OK, I can hook a barfield box to it and get some data to you.

Thanks for the response.

 

[cujet]

GRT sent me an email with the following:

"For every 1 volt change in the output of the map sensor, this corresponds to a change in manifold pressure of 5.64 inches of Hg.

You need to add 4.3 inches of Hg to the conversion (that is, with 0V output, the sensor is indicating 4.3 in Hg)

This assumes it is connected to an analog measuring device with a 46.5K ohm input load. "

I would very much appreciate some assistance with the MAP calibration "sensor file".

Thanks so much!

 

[dynonsupport]

GRT sent me an email with the following:

"For every 1 volt change in the output of the map sensor, this corresponds to a change in manifold pressure of 5.64 inches of Hg.

You need to add 4.3 inches of Hg to the conversion (that is, with 0V output, the sensor is indicating 4.3 in Hg)

This assumes it is connected to an analog measuring device with a 46.5K ohm input load. "

I would very much appreciate some assistance with the MAP calibration "sensor file".

Thanks so much!

Our tech support folks are working at making the "Building Your Own Sensor Profile" process a lot more user-friendly. Unfortunately, they've been swamped of late and haven't made much progress on this project. Check back with Dynon Tech Support after the first of the year.

 

[cujet]

Ok, thanks, I'll bump this thread next year.

 

[cujet]

Bump