VM400
VM400

The VM400 flow velocity measuring device is a compact and space-saving device solution for continuous point-to-point measurement of the air velocity in road and railway tunnels or comparable traffic infrastructure constructions. The VM400 can be assembled easily at nearly any point on tunnel walls. The measured values and status information are transmitted to a monitoring system via the integrated analog or digital interface, as wells as via an Ethernet interface in the VM400E variant.

At a glanceModern ultrasonic technology for non-contact measurementLarge measuring rangeCompact device designVery easy mounting and commissioningImmune to contaminationYour benefitsMinimal wear and long maintenance intervalsReliable measurement even at low air velocityLow investment costsMinimum installation costsEasy integration into monitoring systems

Measured values	Air velocity, Direction of flow, temperature
Measurement principle	Ultrasonic transit time difference measurement
Measuring ranges Air velocity –20 ... 20 m/s
Accuracy < 5 m/s ± 0.1 m/s > 5 m/s ± 2 %
Ambient temperature –30 °C ... +60 °C
Storage temperature	–30 °C ... +60 °C
Ambient humidity	≤ 95 % Relative humidity
Conformities	RABT 2006 RVS 09.02.22
Electrical safety	CE
Enclosure rating IP66 / IP67
Analog outputs	1 output: 4 ... 20 mA, + 750 Ω Electrically isolated
Digital outputs	2 NO: 48 V, 500 mA
Serial ✔ Type of fieldbus integration RS-232 Function Proprietary service interface
Ethernet ✔ Function Connection to SOPAS ET software
Dimensions (W x H x D)	For details see dimensional drawings
Weight	1.4 kg
Material	Aluminum
Electrical connection Voltage 24 Power consumption ≤ 3 W

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