Initial Calibration Test Plans
Differential Pressure Sensor Calibration:
Steps1.
2.
3.
4.
5.
6.
Confirm PCB is able to distinguish voltages from sensor
Place digital flow sensor in line
Ramp input pump voltage from 0V-12V (.5V increments)
At each increment, plot sensor reading versus digital flow sensor reading in Excel
Plot a best fit curve relating the two data sets
Use curve for PCB coding
Gauge Pressure Sensor:
Steps1. Confirm PCB is able to distinguish voltages from sensor
2. Place mechanical pressure gauge in line (accuracy ±10%)
3. Calculate System Back Pressure:
a. Ramp input pump voltage from 0V-12V (.5V increments)
b. At each increment, record readings from both pressure sensors in Excel
c. Plot a best fit curve relating the two data sets
i. (This curve will represent the increasing static pressure of the system at higher
flow rates.)
4. Calculate Pressure:
a. Set input pump voltage at 6V
b. Place shut off valve in line at system exhaust
c. Close valve at various stages to vary pressure on mechanical sensor from (0psi-1psi)
d. At each stage record pressure from both the gauge and sensor in Excel
e. Plot a best fit curve relating the two data sets
i. (This curve will represent the total pressure the sensor is witnessing)
5. Calculate External Pressure:
a. Subtract the system back pressure equation from the total pressure equation
6. Use External Pressure curve for PCB coding
a. Add code to abort if system pressure ever exceeds 0.99 psi
Initial Sensor Feasibility Test Plans
Steps1. Connect system architecture to simulation lung
2. Set Pressure Knob to maximum setting
3. Vary Flow Knob and record readings from both sensors
a. Is the system able to differential noise from reality?
b. Is the system performing as expected?
c. Confirm using flow sensor and pressure gauge
4. Set Flow Knob to maximum setting
5. Vary Pressure Knob and record readings from both sensors
a. Is the system able to differential noise from reality?
b. Is the system performing as expected?
c. Confirm using flow sensor and pressure gauge