Accurate flow-direction detection
The calorimetric measuring principle detects even very small direction changes — below 0.1 m/s. Ideal for closed compressed air and gas ring systems.
- VA 409 – directional flow switchThermal directional flow meter for compressed air and gases, designed to detect flow direction in closed circular pipelines. The calorimetric measuring principle detects even very small direction changes (< 0.1 m/s). Equipped with two LED flow-direction indicators and two potential-free contacts (NC).
| Parameter | VA 409 |
|---|---|
| Response range (direction detection) [m/s] | < 0.1 (at 20 °C and 1000 mbar) |
| Measuring principle | Calorimetric measurement |
| Sensor | Pt 30 / Pt 700 / Pt 330 |
| Measured medium | Air, gases |
| Operating temperature (probe) [°C] | 0 … +50 |
| Operating temperature (housing) [°C] | -20 … +70 |
| Operating pressure | up to 16 bar (232 psi) |
| Power supply | 24 VDC, 40 mA |
| Current consumption (max.) [mA] | 80 (at 24 VDC) |
| Protection | IP54 |
| EMC | according to DIN EN 61326 |
| Connection | 2 × M12, 5-pin (connector A and connector B) |
| Potential-free contacts | 2 × U max. 60 VDC, I max. 0.5 A (standard: normally closed / NC; on request: NO) |
| Housing | Polycarbonate |
| Probe material | Stainless steel 1.4301 |
| Probe dimensions | Length 629 mm; Ø 10 mm (0.39″); safety ring Ø 11.5 mm (0.45″); longer probes on request |
| Mounting thread | G 1/2″ |
| Housing diameter | 2.5″ |
| Direction indication | 2 LEDs |
