Lufft V200A-UMB User Manual

Operating Manual V25/09.2019 Ventus / Ventus-X / V200A
Chapter 6 Equipment Description 7
6 Equipment Description
Ventus is a seawater-resistant wind meter which in addition to determining wind direction and
wind speed is also capable of calculating virtual temperature.
Ventus-X is a Ventus variant. Beneath the standard heating, Ventus-X has got an additional heating,
which is built within the ultrasonic heads. Therefore it particularly is suitable for winter operation.
V200A is a Ventus with a plastic housing. So it is a low-cost alternative to the conventional Ventus .
The equipment is connected by way of an 8 pole screw connector.
The measured values can be requested over a variety of interfaces:
- RS485 interface in half or full duplex
o UMB binary protocol
o UMB ASCII protocol
o NMEA protocol
o SDI-12 protocol
o Modbus-RTU and Modbus-ASCII protocols
- Analog data output of 2 adjustable channels with 4-20 mA, 0 – 10V or (channel 1 only)
as frequency 2 – 2000Hz
During commissioning, configuration and measurement polling takes place using the UMB-
Config-Tool (Windows
®
PC software).
6.1 Wind
The measurement principle implemented for the Ventus -UMB is based on the measurement of
the time of flight of ultrasonic pulses in air.
The measurement setup includes two measurement sections, arranged at an angle of 90°, with
two ultrasonic transceivers each. The measurement sections are activated in turn and the time
of flight of the ultrasonic pulses between the respective transmitter and receiver is measured.
Within one measurement cycle each of the ultrasonic heads will work once as transmitter and
once as receiver.
When measuring in still air all times of flight of one cycle will be equal on average.
If however an air flow is passing through the sensor, the ultrasonic pulse packet moving in the
direction of the air flow will be accelerated, while the packet moving in opposite direction to the
air flow will be decelerated. That means, the time of flight in the direction of wind will be shorter,
while that in direction opposite to the wind direction will be longer.
Figure 1: Measurement Sections

Lufft V200A-UMB Specifications

General

Brand	Lufft
Model	V200A-UMB
Category	Accessories
Language	English