3
Reference Manual
00809-0100-4026, Rev KC
Introduction
October 2018
Introduction
Section 2 Transmitter Overview
Theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3
Application examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4
System architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6
Process characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8
Components of the transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 10
Antenna selection guide/measuring range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 11
2.1 Theory of operation
The Rosemount
™
5400 Level Transmitter is a smart, two-wire continuous level transmitter. A Rosemount
5400 is installed at the top of the tank and emits short microwave pulses towards the product surface in
the tank. When a pulse reaches the surface, part of the energy is reflected back to the antenna for
subsequent processing by the transmitter electronics. The time difference between the transmitted and
reflected pulse is detected by a micro-processor and is converted into a distance, which calculates the
level.
The product level is related to the tank height and the measured distance by the following expression:
Level = Tank Height - Distance
Figure 2-1. Measurement Principle for the Rosemount 5400
A. Signal amplitude D. Distance
B. Radar pulse E. Level
C. Time F. Tank height
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