Convert pressure to voltage, or voltage back to pressure, for a linear sensor: pick its output range, such as 0.5–4.5 V, and enter its pressure range.
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Pressure to Voltage Formula
For a linear sensor, the following formula uses sensitivity and offset. From the endpoint inputs above, S = (Vmax − Vmin)/(Pmax − Pmin) and O = Vmin − S × Pmin, with all pressure values in the same unit.
Variables:
- V is the voltage
- P is the pressure
- S is the sensitivity
- O is the offset
To calculate the voltage, multiply the pressure by the sensitivity and then add the offset.
| Pressure (psi) | Voltage (V) |
|---|---|
| 0 | 0.50 |
| 1 | 0.54 |
| 2 | 0.58 |
| 5 | 0.70 |
| 10 | 0.90 |
| 12 | 0.98 |
| 15 | 1.10 |
| 20 | 1.30 |
| 25 | 1.50 |
| 30 | 1.70 |
| 35 | 1.90 |
| 40 | 2.10 |
| 45 | 2.30 |
| 50 | 2.50 |
| 60 | 2.90 |
| 70 | 3.30 |
| 80 | 3.70 |
| 90 | 4.10 |
| 95 | 4.30 |
| 100 | 4.50 |
| *Assumes linear relation V = (P × S) + O with S = 0.040 V/psi and O = 0.50 V. Typical example: 0–100 psi sensor with ~0.5–4.5 V output. | |
What is Pressure to Voltage Conversion?
Pressure to voltage conversion is a process used in various sensors and transducers where pressure measurements are converted into corresponding voltage signals. This conversion is crucial in many applications, such as industrial automation, automotive systems, and medical devices, where accurate pressure readings need to be translated into electrical signals for monitoring, control, and data acquisition purposes.
How to Calculate Pressure to Voltage?
Use the sensor datasheet to choose its output range (or Custom voltage endpoints) and enter its lower and upper pressure endpoints, then enter the applied pressure. The equivalent sensitivity-and-offset steps are below.
- First, determine the pressure (P).
- Next, determine the sensitivity (S).
- Next, determine the offset (O).
- Finally, calculate the voltage using the formula V = (P * S) + O.
- After inserting the values and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Pressure (P) = 50 Pa
Sensitivity (S) = 0.02 V/Pa
Offset (O) = 1 V; V = 50 × 0.02 + 1 = 2 V. In the calculator above, choose Custom voltage endpoints and Pa, enter pressure endpoints0 and100 Pa, voltage endpoints1 and3 V, and applied pressure50 Pa.
