Page 1 of 1
Negative oil pressure
Posted: Sun Feb 08, 2015 9:06 pm
by fsmlittler
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?
Posted: Wed Feb 11, 2015 6:48 pm
by fsmlittler
Support not around any more?
Posted: Thu Feb 12, 2015 1:36 pm
by Hustler
Not enough information.
Which formula?
Voltage measured at 0 bar?
Andre
Support
Posted: Thu Feb 12, 2015 1:46 pm
by Support
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: Thu Feb 12, 2015 3:13 pm
by fsmlittler
Thanks I'll look into that.