KROHNE optiplex 1300 c, Handbook

Page: 14 / 95

Handbook OPTIFLEX 1300 C
OPTIFLEX 1300 C 14
Refer also to the diagram below.
Guided-radar (TDR) level meters generate electromagnetic fields when a measurement pulse is emitted.
This field is affected by any nearby (metallic) objects and these will weaken and potentially disturb the
emitted pulse.
A minimum distance is recommended depending on the probe type to be installed. See the illustrations
below for recommended free space dimensions. Alternatively, the fitter may use a reference chamber or
stilling well. However, the chamber must be smooth, i.e. no visible weld lines, with straight and vertical walls
to maintain the pulse strength and measurement accuracy.
Position far from other objects in tank!
Risk of measurement error!
Special note: coaxial probes
These probes can be used close to or touching objects or walls as the EM field generated by the probe is
contained within the probe’s outer sheath and cannot be affected by other installations in the tank.
However, the coaxial probe is limited to applications using clean products i.e. non-crystallizing, low-viscosity
products that do not have solids in suspension.