The newly developed VA 521 combines modern digital interfaces for connection to an energy monitoring system with a small, compact design. This compact in-line flow sensor is used when many machines (compressed air consumers or gases) are to be integrated as easily as possible into an energy monitoring network.
The VA 521 measures flow, consumption, velocity and temperature simultaneously. It is the perfect solution for compressed air and technical gas flow measurement , such as nitrogen oxygen, carbon dioxide, argon and mixed gases.
With integrated display
The sensor can be removed from the measuring section and cleaned.
With integrated flow straightener
| Measuring range | 50.0 m/s, low-speed version 92.7 m/s, standard version 185 m/s, max. version 224 m/s, high-speed version |
| Measuring principle | Thermal mass flow sensor |
| Measuring parameters | Flow, consumption, flow speed and temperature |
| Accuracy class (m.v. = of measured value) (f.s. = of full scale) | ± 1.5 % of m.v. ± 0.3 % of f.s. ± 1.0 % of m.v. ± 0.3 % of f.s. (On request) |
| Measuring medium | Air and non-corrosive gases (nitrogen, argon, helium, CO2, oxygen) |
| Measuring units | m3/h, m3/min, l/min, Nm3/h, Nm3/min, Nl/min, cfm, kg/h, kg/min, etc… |
| Display | 1.8” TFT colour display (220 x 176) |
| Response time | t 90 < 3 s |
| Operating pressure | Up to 16 bar |
| Operating temperature | -30...60 °C |
| Outputs | Standard : RS 485 (Modbus-RTU) or 4…20mA Optional : Ethernet interface (Modbus-TCP, PoE, M-Bus |
| Wiring connection | M12 x 2, 5 pores, (M12 connector x2 is included) |
| Power supply | 18...36 VDC, 5 W |
| Burden | < 500 ohm |
| Materials | Housing - Polycarbonate / Measuring Section - Aluminium |
| Protection class | IP 65 |
| Connection | Thread : G ¼” to 2”, NPT ½” – 2”(On request) |
Connection | Measuring Range | L (mm) | B (mm) | H1 (mm) | H (mm) | A1 (mm) | A (mm) | ||
DN 15 | G ½” | 90 m3/h | 50 cfm | 135 | 55 | 50 | 50 | 109.1 | 20 |
DN 20 | G ¾” | 170 m3/h | 100 cfm | 135 | 55 | 50 | 50 | 109.1 | 20 |
DN 25 | G 1” | 290 m3/h | 170 cfm | 135 | 55 | 50 | 80 | 109.1 | 25 |
DN 32 | G ¼” | 530 m3/h | 310 cfm | 135 | 80 | 80 | 80 | 139.1 | 25 |
DN 40 | G 1 ½” | 730 m3/h | 430 cfm | 135 | 80 | 80 | 80 | 139.1 | 25 |
DN 50 | G 2” | 1195 m3/h | 700 cfm | 135 | 80 | 80 | 80 | 139.1 | 30 |
