Flow Sensor VA 400 for Compressed Air and Gases

Our mass flow sensor, VA 400, comes in a robust housing with an optional display to show the actual flow in m³/h, as well as a counter in m³.

The VA 400 can be installed under pressure, using a standard 1/2″ ball valve. A safety ring is provided to prevent an uncontrolled ejection of the probe during installation or removal, which could be caused by the operating pressure. The VA 400 is available in various probe lengths to accommodate different pipe diameters: 120, 160, 220, 300, 400 mm. This makes it suitable for installation into existing pipelines with inner diameters of 1/2″ and upwards.

An engraved depth scale ensures the sensor is positioned correctly in the middle of the pipe. The maximum installation depth matches the respective probe length. For example, a VA 400 with a probe length of 220 mm has a maximum installation depth of 220 mm.

Technical data VA 400

Parameters: m³/h, l/min (1000 mbar, 20°C) in case of compressed air resp. Nm³/h, Nl/min (1013 mbar, 0°C) in case of gases
Adjustable via software: m³/h, m³/min, l/min, l/s, ft/min, cfm, m/s, kg/h, kg/min
Adjustable via keypad: diameter for volume flow calculation, counter resettable
Meas. principle: calorimetric measurement
Sensor: 2 x silicium chip
Meas. medium: air, gases
Gas types adjustable via software: air, nitrogen, argon, nitrous oxide, CO2, oxygen
Meas. range: see table at page 54
Accuracy: ± 4 % m.v.
± 3 % m.v. via 5 point
ISO precision calibration
Operating temp.: -30…110 °C probe tube
-30…80 °C housing
Operating pressure: up to 50 bar
Analogue output: 4…20 mA for m³/h resp. l/min
on request:
scaling for cfm, m³/min, l/min, l/s, ft/min, m/s
Pulse output: 1 pulse per m³, signal high 24 VDC, for 30 ms
PC connection: SDI interface
Power supply: 24 VDC
Burden: ­< 500 Ω
Housing: polycarbonate
Probe tube: stainless steel, 1.4301
mounting length 220 mm, Ø 10 mm
Mounting thread: G 1/2“
Ø housing: 65 mm

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