Pressure Transmitter 4-20mA Calculator
How it works:
This calculator uses the following formula to convert pressure to a 4-20mA signal:
mA output = 4 + ((Current Pressure – Min Pressure) * (20 – 4) / (Max Pressure – Min Pressure))
Where:
- 4mA corresponds to the minimum pressure
- 20mA corresponds to the maximum pressure
- The current pressure determines the mA output between 4 and 20
Based on the search results, I’ve created a comprehensive table summarizing key information about 4-20mA Pressure Transmitters:
| Aspect | Details |
|---|---|
| Definition | A device that converts pressure measurements into a standardized 4-20mA current output signal |
| Operating Principle | Uses a sensing element to measure pressure and converts it to a proportional 4-20mA current |
| Signal Range | 4mA represents 0% of measured pressure, 20mA represents 100% |
| Power Supply | Typically 24V DC (loop-powered) |
| Wiring Configuration | 2-wire loop-powered (most common) |
| Pressure Types | Gauge, Absolute, Differential, Vacuum/Suction, Compound |
| Typical Pressure Ranges | 0-50mbar to 0-6000bar (varies by model) |
| Advantages | – Long distance signal transmission – Low electromagnetic interference – Simple 2-wire connection – Fault detection (below 4mA indicates fault) |
| Disadvantages | – Higher power consumption than voltage output – Non-isolated supply and output |
| Applications | Industrial process control, Oil & gas, Aerospace, HVAC, Water treatment |
| Key Features | – Accuracy (typically 0.25% to 1% full scale) – Temperature compensation – Various material options for different media |
| Output Calculation | mA output = 4 + ((Measured Pressure – Min Pressure) × 16) / (Max Pressure – Min Pressure) |
| Integration | Compatible with most PLCs, DCS, and industrial control systems |
| Additional Protocols | Some models support HART protocol for digital communication |
| Calibration | Usually requires applying known pressures and adjusting output |
| Installation Considerations | Proper sealing, orientation, and electrical connections are crucial |
This table provides a comprehensive overview of 4-20mA pressure transmitters, covering their basic principles, advantages, applications, and key considerations for use in industrial settings.