4–20 mA to 0–300 psi: scaling table
A transmitter calibrated 0–300 psi: 4 mA = 0 psi, 20 mA = 300 psi. Linear output.
At a glance
- Span
- 300 psi
- Change per 1 mA
- 18.75 psi
- Change per 1 %
- 3 psi
- Value at 12 mA
- 150 psi
Scaling table
| Current (mA) | Output (%) | Value (psi) |
|---|---|---|
| 4.00 | 0 % | 0 |
| 6.00 | 12.5 % | 37.5 |
| 8.00 | 25 % | 75 |
| 10.00 | 37.5 % | 112.5 |
| 12.00 | 50 % | 150 |
| 14.00 | 62.5 % | 187.5 |
| 16.00 | 75 % | 225 |
| 18.00 | 87.5 % | 262.5 |
| 20.00 | 100 % | 300 |
NAMUR NE 43 limits in psi
| Current (mA) | Value (psi) | Meaning |
|---|---|---|
| 3.6 | -7.5 | Failure signal, downscale (≤ 3.6 mA) |
| 3.8 | -3.75 | Lower measuring limit (3.8 mA) |
| 20.5 | 309.375 | Upper measuring limit (20.5 mA) |
| 21.0 | 318.75 | Failure signal, upscale (≥ 21 mA) |
Formula
PV = 0 + (I − 4) / 16 × 300 psi
Example: a reading of 13.6 mA corresponds to 180 psi. Going the other way, 225 psi corresponds to 16 mA.
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