Explore topic-wise InterviewSolutions in .

It is just DIFFERENT NAMES for the same TYPE of ANTENNA.

It is just different names for the same type of antenna.

The minimum distance to the TANK wall depends on which antenna is USED. With a more concentrated beam (larger antenna), the CLOSER to the tank wall the DEVICE can be mounted. 

The minimum distance to the tank wall depends on which antenna is used. With a more concentrated beam (larger antenna), the closer to the tank wall the device can be mounted. 

The 5600 Series uses FMCW technology. The transmitter constantly emits a swept FREQUENCY SIGNAL and the distance is calculated by the difference in frequency between the emitted and received signal at any POINT in time. One advantage with FMCW is that higher accuracy can be achieved. For more general information regarding the principle operation please refer to What is the principle of operation under General Questions. The 5400 Series uses Pulsed, free propagating radar. The level of the liquid is measured by short radar pulses which are transmitted from the antenna at the tank top towards the liquid. When a radar pulse reaches a MEDIA with a different dielectric constant, part of the energy is reflected back to the transmitter. The time difference between the transmitted and the reflected pulse is proportional to the distance, from which the level is calculated.

The 5600 Series uses FMCW technology. The transmitter constantly emits a swept frequency signal and the distance is calculated by the difference in frequency between the emitted and received signal at any point in time. One advantage with FMCW is that higher accuracy can be achieved. For more general information regarding the principle operation please refer to What is the principle of operation under General Questions. The 5400 Series uses Pulsed, free propagating radar. The level of the liquid is measured by short radar pulses which are transmitted from the antenna at the tank top towards the liquid. When a radar pulse reaches a media with a different dielectric constant, part of the energy is reflected back to the transmitter. The time difference between the transmitted and the reflected pulse is proportional to the distance, from which the level is calculated.

Like the nozzle the tank wall can also AFFECT the MEASUREMENT through disturbance echoes. The minimum DISTANCE to the tank wall is the same as the distance to any disturbing object that may be present in the tank. If there are obstacles present in the tank the coaxial probe is the BEST probe to USE. If the tank wall is metallic and smooth the probe can be mounted closer to the wall.

Like the nozzle the tank wall can also affect the measurement through disturbance echoes. The minimum distance to the tank wall is the same as the distance to any disturbing object that may be present in the tank. If there are obstacles present in the tank the coaxial probe is the best probe to use. If the tank wall is metallic and smooth the probe can be mounted closer to the wall.

Radar level measurement technology can be BROKEN down into two different categories; Pulsed and Frequency Modulated Continuous Wave (FMCW). An advantage with Pulsed Technology is that it REQUIRES less processing power. Therefore most two-wire gauges use this technology. An advantage with FMCW is that higher ACCURACY can be achieved but more processing power is required and therefore FMCW-radars are TYPICALLY four-wire. In Pulsed transmitters the level measurement is a function of the time taken from the radar signal to travel to the surface and back. In FMCW gauges the transmitter constantly emits a swept frequency and the distance is calculated by the difference in frequency of emitted and received signal.

Radar level measurement technology can be broken down into two different categories; Pulsed and Frequency Modulated Continuous Wave (FMCW). An advantage with Pulsed Technology is that it requires less processing power. Therefore most two-wire gauges use this technology. An advantage with FMCW is that higher accuracy can be achieved but more processing power is required and therefore FMCW-radars are typically four-wire. In Pulsed transmitters the level measurement is a function of the time taken from the radar signal to travel to the surface and back. In FMCW gauges the transmitter constantly emits a swept frequency and the distance is calculated by the difference in frequency of emitted and received signal.