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For additional Information Contact: Philip Starbuck(909)841-7156 [email protected]
Copyright © 2009 Philip Starbuck
Pitot (Prandtl) Airspeed Sensor
Description
The barometric altimeter signal conditioner was designed to convert the barometric pressure applied to apressure transducer to an analog voltage suitable for use in the flight testing of parachute and unmanned aerialvehicles. The amplifier has been used in a number of flight test programs as well as a variety of laboratory andfield test systems. This device is one of a number of modular signal conditioners that have been developed tosupport the instrumentation requirements of the telemetry and design engineering community. These include;Strain Gage / Wheatstone Bridge Amplifier Signal Conditioner, Tri Axis Accelerometer, Differential PressureSensor (suitable for use with pitot tube for airspeed), tri axis rate gyroscope, rotating fan airspeed sensor, andsix channel switch closure event to single channel analog output encoder.
Philip Starbuck(909)841-7156
http://www.psginstrumentation.com/[email protected]
For additional Information Contact: Philip Starbuck(909)841-7156 [email protected]
Copyright © 2009 Philip Starbuck
SIGNAL CONDITIONER CHARACTERISTICS:Pressure Range (Differential): 0 to 10kPa (0 to 1.45 PSI)• Output Voltage Range: 0.2 to 4.7 VDC• Sensitivity: 450mV/kPa•
FEATURES:Uses Freescale MPX5010DP 0 to 10 kPa (0 to 1.45 psi) Differential Pressure Sensor.• Power Supply Voltage: +5.3 to +26VDC, Note device rated for 60VDC maximum.• Remote power enable: pull enable terminal to ground to turn device off, leave open or apply >= 2V to • enable device (Note: Pin has 10K Pullup Resistor to (+) Power In).Output: 0.2 to +4.7V (0 to 10kPa 0 to 1.45 PSI) signal output range.• Integral 100 Hz four pole Butterworth antiailising filter (corner frequency may be specified by user at time • of order).Typical output load: >= 10K ohms• On board radio frequency interference (RFI) attenuation tom minimize the effects of external RFI • interference.Operating Ambient Temp. Range: -40°C to +125°C• Storage Temperature: -40°C to +125°C•
• CONNECTIONS:
Pin 1 - (+) Power IN (+5.3 to +26VDC)Pin 2 - GND (Power Return / Output Signal ReturnPin 3 - Power Disable Input (Leave Unconnected for normal operation / 0V Disable, >= 2V Enable)Pin 4 – Barometric Pressure Output (To Instrumentation System)
Signal Conditioner With Sample Pitot Tube and Static Port
Signal Conditioner With Sample Prandtl Tube
For additional Information Contact: Philip Starbuck(909)841-7156 [email protected]
Copyright © 2009 Philip Starbuck
Signal Conditioner Nominal Transfer Value:Vout = VS x (0.09 x Po + 0.04) ± (Pressure Error x Temp. Factor x 0.09 x Vs) (See sensor data sheet)• Pd (kPa) = {((Vout / 5V) + 0.04) / 0.009}•
Spreadsheet Function:Differential Pressure (kPa) = (((Vout/5)+0.095)/0.009)
Where:Pd = Differential Pressure (kPa)• Supply Voltage: Vs = 5.0Vdc• Signal Conditioner Output Voltage: Vout (V)•
Determining Airspeed from Differential Pressure:An equation for converting the pressure differential to airspeed is:
§ V = -square root of {(2 * Dynamic Pressure (Pascals)) / Standard Density (Kg/M^3)}•
Spreadsheet Function:V = -sqrt{(2 * (Pd /1000)) / 1.225}•
Where:· V = Velocity (meters / second)• · Pd = Differential Pressure (kPa)• · Standard Density = 1.225Kg/M^3.•
CIRCUIT BOARD PHYSICAL DIMENSIONS, MOUNTING, and TERMINAL HOLE LOCATIONS:
