Technical data
VA 550 English V1.21 Page 9 of 53
4 Technical data
Measures: mass flow, consumption
flow speed, temperature
Measuring principle: thermal mass flow sensor
Medium temperature range: -40 ... 180°C Probe (ATEX-Version -20°C … 120°C)
Operating temperature range: -20 ... 70 °C
Operating pressure: 50 bar
Power supply: 18 … 36 VDC
Optional: PoE according to IEEE 802.3af, PD Class 2 (max.
6.5W), voltage from 36V to 57V DC
Power consumption: max. 5W
Output: Modbus RTU (acc. EIA/TIA-485 Standard)
2 x 4...20 mA active (optional passive) RL < 500Ohm
galvanically isolated pulse (Pulse weight freely selectable,
Alarm max. 48Vdc 0,5A Relay: Normally Closed )
optional: Modbus TCP, HART, ProfibusDP, Profi Net,
Accuracy: ± 1,5 % m.v. ± 0,3 % f.s.
Standard version*
(m.v. of meas. value)
(f.s. of full scale)
Accuracy: ± 1,0 % m.v. ± 0,3 % f.s.
Precision version*
(m.v. of meas. value)
(f.s. of full scale)
Repeatability : 0,25% m.v in case of correct mounting(mounting aid,
position, inlet section
Accuracy indications: referred to ambient temperature 22°C +/-2°C, system
pressure 6bar
Response time: t90 < 3s
Display: 2“ TFT Color Display (320 x 240)
Screw in thread: G 1/2“ ISO 228, NPT 1/2“, R 1/2“, PT 1/2“
Material: Housing aluminum die cast,
probe stainless steel1,4571
Protection class IP67
* Reference conditions for Temperature and pressure can be freely set, standard conditions are 0 ° and 1013 mbar.
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