4–20 mA to -50–150 °C: scaling table
A transmitter calibrated -50–150 °C: 4 mA = -50 °C, 20 mA = 150 °C. Linear output.
At a glance
- Span
- 200 °C
- Change per 1 mA
- 12.5 °C
- Change per 1 %
- 2 °C
- Value at 12 mA
- 50 °C
Scaling table
| Current (mA) | Output (%) | Value (°C) |
|---|---|---|
| 4.00 | 0 % | -50 |
| 6.00 | 12.5 % | -25 |
| 8.00 | 25 % | 0 |
| 10.00 | 37.5 % | 25 |
| 12.00 | 50 % | 50 |
| 14.00 | 62.5 % | 75 |
| 16.00 | 75 % | 100 |
| 18.00 | 87.5 % | 125 |
| 20.00 | 100 % | 150 |
NAMUR NE 43 limits in °C
| Current (mA) | Value (°C) | Meaning |
|---|---|---|
| 3.6 | -55 | Failure signal, downscale (≤ 3.6 mA) |
| 3.8 | -52.5 | Lower measuring limit (3.8 mA) |
| 20.5 | 156.25 | Upper measuring limit (20.5 mA) |
| 21.0 | 162.5 | Failure signal, upscale (≥ 21 mA) |
Formula
PV = -50 + (I − 4) / 16 × 200 °C
Example: a reading of 13.6 mA corresponds to 70 °C. Going the other way, 100 °C corresponds to 16 mA.
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