Water level: 0.01…10 m (0.1…100 cm) Flow velocity: 1…50 m/s (0.01…5 m/s) Contactless measurement by means of a non-contact radar system. The measuring device is integrated into an existing measuring station or installed in a separate room. The measuring unit consists of a radar transmitter and receiver, which are connected to a PC via a USB cable or Bluetooth connection with an integrated wireless LAN interface (optional). There are three different versions available: the “CHANNEL” version measures flow velocities in channels up to 200 m wide, the “RIVER” version measures flow velocities in rivers up to 100 m wide and the “RIVER PLUS” version can be used for both measurements at once.
The measurement system consists of a watertight transmitter and receiver unit built into a single housing. The transmitter unit is installed on the bed of the stream or river, while the receiver unit is mounted on a bridge or other structure. The distance between transmitter and receiver must be known in advance in order to calculate the velocity of flow.
The maximum range at which flow can be measured is determined by the size of the receiving antenna, which is about 3 m for large rivers and up to 10 m for small streams. This method can also be used in channels with very low velocities (less than 1 m/s).
The velocity of flow can be calculated from measurements taken with two different antennas: one placed upstream of an obstacle and one downstream (figure 1). The difference between these two readings gives an idea of how fast water flows past this point. If there are several obstacles along the channel, measurements should be taken at each one separately. Depending on the type of obstacle and its position relative to other obstacles, it may be necessary to take several readings per location (figure 2).
The LASER LINE non-contact discharge measurement systems are made up of the control unit, the transmitter, and the receiver head. The transmitter emits a signal which is reflected by the water surface and received by the receiver head.