Inline Flow Meter for Compressed Air & Gases
The new affordable flow sensors VA 520 work according to the approved calorimetric measuring principle. An additional pressure and temperature compensation is not necessary. Contrary to the previously used bridge circuit the newly developed evaluation electronics records all measured values digitally. This enables very precise and fast measurements.
The new VA 520 series have integrated Modbus output as a standard, all parameters can be transferred via Modbus. Due to its compact design it is possible to monitor all compressed air systems from the compressor to the smallest compressed air tool (1/4“ to 2 inch) with the new affordable flow sensor VA 520. VA 500 flow sensors are available for larger pipe diameters from DN 50 to DN 300. Apart from compressed air also other gases like e.g. nitrogen, oxygen and CO2 can be measured.
| Measuring range | 50 Nm/s, low-speed version 92.7 Nm/s, standard version 185 Nm/s, max. version 224 Nm/s, high-speed version |
| Measuring principal | 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, nitrous oxide) |
| 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 | 16 bar / High pressure version 40 bar (PN40) |
| Operating temperature | -30...110 °C (Sensor probe) -30...80 °C (Display unit) |
| Digital output | Digital - RS 485 interface, (Modbus-RTU) / Ethernet interface PoE, M-Bus (Optional) |
| Analogue output | 4...20 mA for m3/h or l/min |
| Pulse output | 1 pulse per m3 or per litre |
| 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 - Stainless steel 304 or 316Ti |
| Protection class | IP 65 |
| Connection | Thread : R ½” – 2”, NPT ½” – 2” Flange : ANSI DIN 1092-1, ANSI 15.5 Class 150 lbs, ANSI 16.5 Class 300 lbs |
Thread Size | Pipe OD (mm) | Pipe ID (mm) | L (mm) | L1 (mm) | H (mm) | H1 (mm) | A (mm) |
½” | 21.3 | 16.1 | 300 | 210 | 176 | 165.7 | 20 |
¾” | 26.9 | 21.7 | 475 | 275 | 179 | 165.7 | 20 |
1” | 33.7 | 27.3 | 475 | 275 | 182 | 165.7 | 25 |
1 ¼” | 42.4 | 36 | 475 | 275 | 186 | 165.7 | 25 |
1 ½” | 48.3 | 41.9 | 475 | 275 | 189 | 165.7 | 25 |
2” | 60.3 | 53.1 | 475 | 275 | 195 | 165.7 | 30 |
Flange Size | Pipe OD (mm) | Pipe ID (mm) | L (mm) | L1 (mm) | H (mm) | H1 (mm) | ØD (mm) | ØK (mm) | N x ØL (mm) |
DN15 | 21.3 | 16.1 | 300 | 210 | 213.2 | 165.7 | 95 | 65 | 4 x 14 |
DN20 | 26.9 | 21.7 | 475 | 275 | 218.2 | 165.7 | 105 | 75 | 4 x 14 |
DN25 | 33.7 | 27.3 | 475 | 275 | 223.2 | 165.7 | 115 | 85 | 4 x 14 |
DN32 | 42.4 | 36 | 475 | 275 | 235.7 | 165.7 | 140 | 100 | 4 x 18 |
DN40 | 48.3 | 41.9 | 475 | 275 | 240.7 | 165.7 | 150 | 110 | 4 x 18 |
DN50 | 60.3 | 53.1 | 475 | 275 | 248.2 | 165.7 | 165 | 125 | 4 x 18 |
DN65 | 76.1 | 68.9 | 475 | 275 | 268.2 | 175.7 | 185 | 145 | 8 x 18 |
DN80 | 88.9 | 80.9 | 475 | 275 | 275.7 | 175.7 | 200 | 160 | 8 x 18 |