Vessel Characteristics; Non-Contacting Radar Technology - Emerson Rosemount 1208C Reference Manual

Transmitter overview
March 2023
2.2.2 Foam and turbulence
Foaming liquids or turbulence may cause weak and varying surface echo amplitudes.
Surface turbulence is not normally a problem unless it is excessive.
Measurement in foamy applications depends largely on the foam properties. When the
foam is light and airy, the actual product level is measured. For heavy and dense foam, the
transmitter may measure the level of the foam's upper surface.
2.3

Vessel characteristics

2.3.1 In-tank obstructions
The transmitter should be mounted so that objects such as heating coils, ladders, and
agitators are not in the radar signal path. These objects may cause false echoes resulting
in reduced measurement performance. However, the transmitter has built-in functions
designed to reduce the influence from disturbing objects where such objects cannot be
totally avoided.
Vertical and inclined structures cause minimal effect since the radar signal is scattered
rather than directed back to the antenna.
2.4

Non-contacting radar technology

Non-contacting radar technology is ideal for a wide range of applications as it is
maintenance-free, has a top-down installation that reduces the risk of leakages, and is
unaffected by process conditions such as density, viscosity, temperature, pressure, and pH.
The Rosemount 1208C uses Frequency Modulated Continuous Wave (FMCW) technology
and smart algorithms to maximize measurement accuracy and reliability, even in small
tanks and challenging fast-filling vessels.
2.4.1 Application examples
Level and pump control
Pump stations need accurate measurement and control to ensure an optimal water flow to
the next stage of the potabiliztion process, while also avoiding overflows and pumps from
dry-running. Level measurement is essential to ensure a sustainable extraction of water
and a sufficient supply of water to the next phases of the potabilization process.
10 Rosemount 1208C Level and Flow Transmitter
Reference Manual
00809-0200-7062