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CHAPTER 2
Introduction
The LWT series of instruments are microprocessor-based level transmitters that use very low power
microwave energy to determine the level of the product being measured. A rod, cable or coaxial “probe”
is hung into the vessel to act as a waveguide, i.e. microwave energy stays concentrated around the
length of the probe instead of being dispersed, as it would be if there was no probe.
About this guide
This user guide is intended for personnel using LWT series instruments for routine monitoring. It
contains installation, usage, maintenance, and troubleshooting instructions.
Read this guide carefully before working with the instrument. For personnel and system safety, and
for optimum performance, make sure that you thoroughly understand the contents of this document
before installing, using or maintaining the instrument. This guide does not contain detailed information
on all available models or every conceivable event that may occur during setup, operation, and
maintenance work.
Basics of LWT level measurement
The instrument electronics housing (a.k.a. “the head”) is fitted with a special adapter (a.k.a. “the
coupler”) that serves as a connection between the head and the process in which measurements will
be taken. A rod – single or coaxial – or cable (a.k.a. “the probe”) hangs from the coupler into the product
being measured (see Figure 1 on page 8).
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