Excellent sensitivity at low velocities
High low-end sensitivity enables accurate measurement from 2 m/s, covering the full operating range of variable-speed (VSD) compressors.
- Differential-pressure flow sensor (VD 550)Robust flow sensor for wet compressed air and gases, measuring flow, total consumption, temperature, and pressure.
- Installation under pressure via ball valve1/2" or 3/4" ball-valve installation enables mounting/service under pressure without system shutdown.
- Rugged housing for outdoor use (IP67)Impact-resistant die-cast aluminum version with IP67 protection, suitable for outdoor installation.
- Basic outputs and communicationPulse output, RS-485 (Modbus RTU), and 1× 4–20 mA analog output (electrically non-isolated).
| Parameter | VD 550 |
|---|---|
| Measuring range | 2 … 224 m/s / 600 m/s (compressed air); 0.04 … 500 mbar differential pressure (gases) |
| Measured medium | Air and gases |
| Accuracy | ± 1.5% of reading |
| Measuring principle | Differential pressure |
| Measuring span | 1 : 100 / 300 |
| Response time | t99 < 1 s |
| Medium temperature | –30 … +180 °C |
| Operating pressure | –1 … +100 bar (g) |
| Ambient temperature | –20 … +70 °C |
| Protection class | IP67 |
| Power supply | 18 … 36 V DC, 5 W |
| Output signals (standard) | 1× 4–20 mA analog output (electrically non-isolated), pulse output, RS-485 (Modbus RTU) |
| Output signals (optional) | 2× 4–20 mA active outputs, Ethernet interface (PoE), M-Bus, HART, IO-Link |
