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Description
3.2 Principle of operation
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Figure 3.1
Nameplate
The nameplate contains the most important data for identification and use of the
transmitter.
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Figure 3.2
3.2
Principle of operation
Application area
SITRANS LR140 is a radar transmitter for non-contact, continuous level
measurement. It is suitable for liquids and solids in practically all industries.
Functional principle
The transmitter emits a continuous, frequency-modulated radar signal through its
antenna. The emitted signal is reflected by the medium and received by the antenna
as an echo with modified frequency. The frequency change is proportional to the
distance and is converted into the level.
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Process seal (G type threaded connections only)
Electronics housing
Housing lid
Ventilation/pressure compensation
Components of SITRANS LR140 (Example process fitting G1½)
Transmitter type
Serial number
Technical data
Field for approvals
QR code for device documentation
Wireless access via smart device
Layout of the nameplate (example)
SITRANS LR140
Operating Instructions, 08/2020, A5E50352144
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