for Wet Compressed Air
The integrated, precise differential pressure sensor measures the differential pressure / dynamic pressure at the sensor tip. The pressure depends on the respective gas velocity. The flow is therefore easy to determine by means of the pipe diameter. The additional measurement of temperature and absolute pressure and calculation of the relevant density means that measuring can be carried out for various gases, a wide variety of temperatures and pressures.
The VD500 uses the differential pressure principle. In the picture on the right, the principle is explained.
Flow will create a differential pressure over the probe. The integrated, precise differential pressure sensor measures the differential pressure/ dynamic pressure at the sensor tip. The pressure depends on the respective gas velocity. The flow is therefore easy to determine by means of the pipe diameter.
The additional measurement of temperature and absolute pressure and calculation of the relevant density means that measuring can be carried out for various gases, a wide variety of temperatures and pressures.
| Measuring range | 224 m/s, max. version 600 m/s, high-speed version |
| Measuring principal | Differential Pressure |
| Measuring parameters | Flow, consumption, flow speed, temperature and pressure |
| Accuracy class (m.v. = of measured value) (f.s. = of full scale) | ± 1.5 % of m.v.* ± 0.3 % of f.s.(20…224 m/s)* ± 1.5 % of m.v. (> 224 m/s) |
| Measuring unit | m3/h, m3/min, l/min, Nm3/h, Nm3/min, Nl/min, cfm, kg/h, kg/min, etc… |
| Measuring span | 1 : 10 |
| Display | 1.8” TFT colour display (220 x 176) |
| Measured medium | Compressed air |
| Operating temperature (medium) | -30...+180 °C |
| Operating pressure | Max. 20 bar |
| Digital output | Digital - RS 485 interface, (Modbus-RTU) / Ethernet interface PoE, M-Bus (Optional) |
| Analogue output | 4...20 mA |
| Pulse output | 1 pulse per m3 |
| Wiring connection | M12 x 2, 5 pores, (M12 connector x2 is included) |
| Power supply | 18...36 VDC, 5 W |
| Burden | < 500 Ω |
| Materials | Housing - Polycarbonate Sensor probe - Stainless steel 304 (1.4301) / 316L (1.4404) |
| Protection class | IP65 |
| Mounting thread | G 1/2" ISO 228, NPT 1/2" (On request) |
Flow measuring ranges VD 500 for compressed air at typical 7 bar (abs) and 50 °C (ISO 1217:1000 mbar, 20 °C) | ||||
Inner Diameter of Pipe (OD) | Measuring range initial and full scale (20 … 224 m/s) | |||
Inch | mm | DN | m3/h | cfm |
¾” | 21.7 | 20 | 19 … 215 | 11 … 127 |
1” | 27.3 | 25 | 32 … 357 | 19 … 210 |
1 ¼” | 36.0 | 32 | 57 … 644 | 34 … 379 |
1 ½” | 41.9 | 40 | 79 … 886 | 47 … 522 |
2” | 53.1 | 50 | 130 … 1450 | 76 … 853 |
2 ½” | 68.9 | 65 | 222 … 2484 | 131 …1462 |
3” | 80.9 | 80 | 307 … 3440 | 181 …2025 |
4” | 110.0 | 100 | 571 … 6391 | 336 … 3762 |
5” | 133.7 | 125 | 844 … 9453 | 497 … 5564 |
6” | 159.3 | 150 | 1200 … 13436 | 706 … 7908 |
8” | 200.0 | 200 | 1896 … 21230 | 1116 … 12495 |
10” | 250.0 | 250 | 2966 … 33211 | 1746 … 19547 |
12” | 300.0 | 300 | 4276 … 47881 | 2517 … 28182 |
