Dash 2 formula for Autometer Oil Pressure sensor

dobuy
Posts: 20
Joined: Mon Dec 12, 2005 11:08 am

Dash 2 formula for Autometer Oil Pressure sensor

Postby dobuy » Thu Jan 17, 2013 6:52 am

Trying to get my Dash 2 working with an Autometer 240-33ohm, 100 psi sensor. I have installed the sensor with a 100ohm resistor, I will only be adding a RT wheel speed sensor, so should be OK on the amps.

Trying to figure out what the formula I need should be for the sensor, can anyone help me with the formula/equation please?

On the Autometer sensor the 240 ohms is the 0psi resistance and 33ohms is the 100psi resistance.

Here is a graph and some info from the web that someone else did on an Autometer sensor which may reveal some useful data

As you can see from the graph, the Autometer 2242 is a much better pressure transducer than the stock Fox sender. I ran a linear trendline and the sensor is pretty darned close to the line. The equation for the trendline is yPSI=108.4-0.56xOhms. Assuming the linear sensor performance continues to 100 PSI (which I must do since I have such a wimpy compressor) then you will see 15 Ohms at 100 PSI.


PSI Resistance in Ohms
75 70
70 73
65 79
60 85
55 95
50 105
45 113
40 120
35 130
30 140
25 148
20 156
15 170
10 190
0 267


Image
Caterham 7 Duratec
www.biggles.net

dobuy
Posts: 20
Joined: Mon Dec 12, 2005 11:08 am

Postby dobuy » Thu Jan 17, 2013 6:49 pm

replying to my own topic, got an answer today from Kieran, based on the data above and a 100ohm resistor the equation is
y = 16.975x3 - 139.6x2 + 325.31x - 153.81

As always great support from RT
:D
Caterham 7 Duratec
www.biggles.net


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