Negative oil pressure

fsmlittler
Posts: 11
Joined: Thu Nov 21, 2013 5:31 pm

Negative oil pressure

Postby fsmlittler » Sun Feb 08, 2015 9:06 pm

Using RT oil pressure sensor on a dash 2 and I'm getting a -3 reading for oil pressure when the ignition is switched on but motor isn't running. Why not zero?

fsmlittler
Posts: 11
Joined: Thu Nov 21, 2013 5:31 pm

Postby fsmlittler » Wed Feb 11, 2015 6:48 pm

Support not around any more?

Hustler
Posts: 20
Joined: Fri Jan 23, 2015 10:31 am
Location: Hamburg

Postby Hustler » Thu Feb 12, 2015 1:36 pm

Not enough information.
Which formula?
Voltage measured at 0 bar?
Andre
DL1-MK3+20HzGPS, DASH3

Support
Posts: 399
Joined: Mon Nov 21, 2005 4:09 pm

Support

Postby Support » Thu Feb 12, 2015 1:46 pm

Hello,

The sensor equation for pressure in psi is P = 36.25*volts - 18.12

Volts = (P+18.25)/36.25

0 psi should be 0.5 volts

-3psi = 0.417 volts

The sensor is accurate to 1% of the 145psi full scale which equals a minimum reading of 0.46v at 0 psi.

This means one or a combination of the following...

* Sensor out of spec
* DASH2 calibration error
* Poor sensor connection

I suspect it is a combination, if the offset is constant I recommend you change the equation to 36.25*volts - 15.12. Alternatively measure the voltage going into the DASH from the sensor with a multi-meter and a good ground to determine the problem.

If the problem is sensor calibration or DASH calibration please contact

service at race - technology . com

Kind regards,
Support (K)
______________________________
Posted by Race Technology Support

fsmlittler
Posts: 11
Joined: Thu Nov 21, 2013 5:31 pm

Postby fsmlittler » Thu Feb 12, 2015 3:13 pm

Thanks I'll look into that.


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