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4.4 Special information on DNV-GL approval

For use under DNV-GL conditions (if device approval is available), observe

the following instructions:

• Single probes and coaxial probes up to a length of 500 mm can be

operated without support�

• For probe lengths from 500 mm to 2000 mm, coaxial probes must be

used� These must be supported additionally, either at half length or at

the end� The support must be suited to damp occurring vibrations�

• If using a coaxial pipe with a length of 700 mm or longer, additional

centering pieces must be mounted in this coaxial pipe (→ Accessories).

5 Function

5.1 Measuring principle

fig. 5-1 fig. 5-2

The unit operates to the principle of guided wave radar� It measures the level

using electromagnetic pulses in the nanosecond range�

The pulses are transmitted by the sensor head and guided along the rod

(fig� 5-1)� When they hit the medium to be detected they are reflected and guided

back to the sensor (fig� 5-2)� The time between transmitting and receiving the

pulse directly relates to the travelled distance (D) and the current level� The

reference for distance measurement is the lower edge of the process connection�

The figures show the operation with single probe� In case of operation with

a coaxial probe, the guided wave runs only along the inside of the coaxial

pipe�

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IFM LX Series Specifications

General