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The SICK VM400 is a flow measurement instrument documented for road and rail tunnels and for measured-value recording used in tunnel ventilation control. The VM400E variant uses ultrasonic transit time difference measurement to determine air velocity, direction of flow and temperature.
For VM400E, SICK documents an air-velocity range of −20 m/s to +20 m/s. Accuracy is documented as ±0.1 m/s below 5 m/s and ±2 % above 5 m/s. The operating and storage temperature range is −30 °C to +60 °C.
The VM400E provides one electrically isolated 4 mA to 20 mA analog output with a 750 Ω load, two normally open digital outputs rated at 48 V and 500 mA, RS-232 service communication and Ethernet for connection to the SOPAS ET software.
The documented VM400E enclosure rating is IP66 / IP67. The specified weight is 1.4 kg and the housing material is aluminum. The electrical supply is documented as 24 V with a power consumption of ≤ 3 W.
| Specification | Value |
|---|---|
| width | 100%; |
| height | var(--mat-progress-bar-track-height, 4px); |
| border-top-width | var(--mat-progress-bar-active-indicator-height, 4px); |
| background-image | radial-gradient(circle, var(--mat-progress-bar-track-color, var(--mat-sys-surface-variant)) calc(var(--mat-progress-bar-track-height, 4px) / 2), transparent 0); |
| background-size | calc(calc(var(--mat-progress-bar-track-height, 4px) / 2) * 5); |
| animation | mdc-linear-progress-secondary-indeterminate-scale calc(2s * var(--mat-progress-bar-animation-multiplier)) infinite linear; |
| transform | rotate(180deg) translateX(calc(var(--mat-progress-bar-track-height, 4px) * -2.5)); |
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