For multi gases and heavy duty application
The new flow sensors VA550 work according to the calorimetric measuring principle. Therefore, an additional temperature and pressure compensation is not necessary. Due to its robust design, the aluminum die cast housing, the robust sensor tip made from stainless steel 316Ti, the new VA 550 are suitable for demanding industrial application and harsh environment. An ATEX version is available for applications in explosive areas. For flow measurement e.g. of natural gas there is a version with a DVWG admission.
Contrary to the previously used bridge circuit the newly developed evaluation electronics records all measured values digitally. This allows very precise and fast measurements with a wide temperature range of up to 180 °C (resp. 350 °C). The measuring span is 1...1000 and VA 550 has an integrated Modbus output as a standard with which all parameters like Nm3/h, Nm3/min, kg/h, kg/min, cfm etc. can be transferred.
All wetted parts made by stainless steel 1.4571 (316Ti)
The sensor can also be configured in the ATEX area, without the housing needing to be opened.
The sensor can be removed and cleaned.
| 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 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, nitrogen, argon, helium, CO2, oxygen, natural gas (NG), propane, bio gas, etc… |
| Measuring units | m3/h, m3/min, l/min, Nm3/h, Nm3/min, Nl/min, cfm, kg/h, kg/min, etc… |
| Display | 2” TFT colour display (320 x 240) |
| Response time | t 90 < 3 s |
| Operating pressure | 50 bar, in special version 100 bar (with DVGW approval max. 16 bar) |
| Operating temperature | -40...180 °C (Standard version) -20...70 °C (Display unit) -20...120 °C (ATEX version) |
| Outputs | Standard : 1 x 4...20 mA analogue output, pulse output, RS 485 (Modbus-RTU) Optional : 2 x 4...20 mA active, Modbus TCP, HART, Profibus DP, Profinet, M-Bus |
| Power supply | 18...36 VDC, 5 W |
| Burden | < 500 ohm |
| Materials | Housing - Die-cast aluminium / Sensor probe - Stainless steel 316Ti (1.4571) |
| Protection class | IP 67 |
| Mounting thread | G 1/2" ISO 228, NPT 1/2", R 1/2", PT 1/2" |
| Approval | ATEX II 2G Ex db IIC T4 Gb, ATEX II 2D Ex tb IIC T90 °C, Db, DVGW |
Inner Pipe Diameter (ID) | 25mm | 50mm | 80mm | 100mm | 150mm | 200mm | 250mm | 300mm | |
1” | 2” | 3”” | 4”” | 6” | 8” | 10” | 12” | ||
Flow Measurement Units | m3/h (cfm) | m3/h (cfm) | m3/h (cfm) | m3/h (cfm) | m3/h (cfm) | m3/h (cfm) | m3/h (cfm) | m3/h (cfm) | |
Reference conditions DIN 1945 / ISO 1217: 20 °C, 1000 mbar | |||||||||
Air | Low-Speed (50 m/s) | 65.9 | 323.7 | 751.9 | 1177.6 | 1844.5 | 4738.8 | 7413.2 | 10687.7 |
Standard (92.7 m/s) | 122.2 | 530.8 | 1394.0 | 2183.3 | 4930.2 | 8785.7 | 13744.0 | 19815.0 | |
Max (185 m/s) | 243.9 | 1029.2 | 2781.9 | 4357.2 | 9839.0 | 17533.5 | 27428.8 | 39544.5 | |
High-Speed (224 m/s) | 295.3 | 1282.5 | 3368.4 | 5275.8 | 11913.2 | 21229.7 | 33211.0 | 47880.9 | |
Reference conditions DIN 1945 / ISO 1217: 20 °C, 1000 mbar | |||||||||
Argon (Ar) | Low-Speed (50 m/s) | 103.1 | 447.6 | 1175.5 | 1841.2 | 4157.6 | 7409.0 | 11590.4 | 16710.1 |
Standard (92.7 m/s) | 191.1 | 829.8 | 2179.4 | 3413.5 | 7708.0 | 13737.8 | 21487.8 | 30979.4 | |
Max (185 m/s) | 381.3 | 1656.1 | 4349.5 | 6812.5 | 15383.2 | 27413.4 | 42884.5 | 61827.4 | |
High-Speed (224 m/s) | 461.7 | 2005.2 | 5266.4 | 8248.6 | 18626.2 | 33192.4 | 51925.1 | 74861.2 | |
Carbon Dioxide (CO2) | Low-Speed (50 m/s) | 65.2 | 283.3 | 744.1 | 1165.4 | 2631.6 | 4689.5 | 7336.1 | 10576.6 |
Standard (92.7 m/s) | 120.9 | 525.2 | 1379.4 | 2160.5 | 4878.6 | 8693.8 | 13600.2 | 19607.7 | |
Max (185 m/s) | 241.3 | 1048.2 | 2753.0 | 4311.9 | 9735.8 | 17351.3 | 27143.7 | 39133.6 | |
High-Speed (224 m/s) | 292.2 | 1269.2 | 3333.4 | 5220.9 | 11789.4 | 21009.1 | 32865.9 | 47383.3 | |
Nitrogen (N2) | Low-Speed (50 m/s) | 60.6 | 263.3 | 691.4 | 1082.9 | 2445.4 | 4357.7 | 6817.1 | 9828.3 |
Standard (92.7 m/s) | 112.4 | 488.1 | 1281.9 | 2007.8 | 4533.7 | 8079.2 | 12638.9 | 18221.7 | |
Max (185 m/s) | 224.3 | 974.1 | 2558.2 | 4006.9 | 9047.9 | 16123.6 | 25223.2 | 36364.7 | |
High-Speed (224 m/s) | 271.6 | 1179.4 | 3097.5 | 4851.6 | 10955.3 | 19522.7 | 30540.6 | 44030.9 | |
Oxygen (O2) | Low-Speed (50 m/s) | 62.8 | 272.9 | 716.8 | 1122.7 | 2535.3 | 4517.9 | 7067.7 | 10189.6 |
Standard (92.7 m/s) | 116.4 | 505.5 | 1327.5 | 2079.2 | 4695.1 | 8366.8 | 13088.7 | 18870.1 | |
Max (185 m/s) | 232.5 | 1009.9 | 2652.3 | 4154.1 | 9380.5 | 16716.3 | 26150.4 | 37701.5 | |
High-Speed (224 m/s) | 281.5 | 1222.8 | 3211.4 | 5029.9 | 11358.0 | 20240.3 | 31663.2 | 45649.4 | |
Natural Gas (NG) | Low-Speed (50 m/s) | 39 | 169.4 | 444.9 | 696.9 | 1091.5 | 1573.6 | 2804.2 | 4386.8 |
Standard (92.7 m/s) | 72.3 | 314.1 | 824.9 | 1292.0 | 2917.4 | 5199.0 | 8133.1 | 11725.6 | |
Max (185 m/s) | 144.3 | 626.8 | 1646.2 | 2578.4 | 5822.3 | 11060.9 | 16231.1 | 23400.7 | |
High-Speed (224 m/s) | 174.7 | 758.9 | 1993.3 | 3122.0 | 7049.7 | 12562.8 | 19652.8 | 28333.8 | |
Probe Type | L (mm) | H (mm) |
C1 | 220 | 441 |
C2 | 300 | 521 |
C3 | 400 | 621 |
C4 | 500 | 721 |
C5 | 600 | 821 |
C6 | 700 | 921 |
C7 | 160 | 381 |
C8 | 1000 | 1221 |