Brake Pressure Sensor
This brake pressure sensor is specifically designed for measuring the high pressures in automotive braking systems. It is extremely robust and resistant to brake fluids, mineral oils, water and air.
| Pressure range | 250bar |
| Pressure range | 25Mpa |
| Offset accuracy | 2.0% |
| Sensitivity accuracy at 5V In range 0 to 35 bar FS | 0.7% |
| In range 35 to 250 bar | 5.0% (of measured value) |
| Power supply voltage | 5 ±0.25 V |
| Power supply current | 20mA |
| Output current | -0.1 to 3mA |
| temperature range | -40 to +120°C |
| Overpressure max (Pmax) | 350bar |
| Burst pressure (Pburst) | >500bar |
| Tightening torque | 20±2Nm |
Design and function
Pressure measurement results from the bending of a steel diaphragm on which are located polysilicon strain-guage elements. These are connected in the form of a Wheatstone bridge. This permits high signal utilisation and good temperature compensation. Part of the evaluation IC is applied for a diagnostic function which can detect the following potential defects:
- Fracture of a bonding wire to the measuring cell.
- Fracture anywhere on any of the signal lines.
- Fracture of the bridge supply and ground.
Following switch-on the sensor runs a self-test diagnostic function checking for correct calibration and functionality. During normal operation a diagnostic function checks for errors. If an error is detected, the signal output is switched to the voltage range >96% Uv.
Installation
Extreme care must be taken installing any product that connects to the braking system of a car - we take absolutely no responsibility for installation, and recommend that if in any doubt you employ a professional!
If the sensor has been supplied by Race Technology with a cable attached then wires from the sensors are:
- Red - Connect to the +5v reference output from the DL1/DL2/DASH2
- Back - Connect to ground (0v) on the DL1/DL2/DASH2
- White - Signal output from the sensor, this can be connected to any of the analogue inputs on the DL1/DL2/DASH2
Equation to convert from a voltage to a pressure
Note that if you are connecting the sensor to a DASH2, then the equation can be simply selected from the drop down list in the configuration software. Similarly, if the sensor is to be attached to a DL1/DL2 then the equation can be simply selected from the relevant section in the variable manager of the analysis software. These equations are just included for completeness, or in case the sensor is going to be used with a 3rd party product.
Pressure [Bar] = ((( input - 0.58) / 4 ) * 250 )
Pressure [PSI] = ((( input - 0.58) / 4 ) * 250 ) * 14.5
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