Burkert 8137 Manuel D'instructions page 9

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Application area
Functional principle
Power supply
LEVEL TRANSMITTER 8137 • 4 ... 20 mA/HART
Article number
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Serial number
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Technical data
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Article numbers documentation
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3.2 Principle of operation
LEVEL TRANSMITTER 8137 is a radar sensor in K-band (emitting
frequency approx. 26 GHz) for continuous level measurement.
A suitable version of LEVEL TRANSMITTER 8137 is available for each
area of application:
The version with "thread and horn antenna with ø 40 mm (1.575 in)"
is particularly suitable for small tanks and process vessels for
measurement of virtually all products.
The version with "Flange and horn antenna with ø 48 ... 95 mm
(1.89 ... 3.74 in)" is particularly suitable for storage tanks and process
vessels, for measurement of products such as solvents, hydrocarbons
and fuels under most difficult process conditions.
The version with "Parabolic antenna" is particularly suitable for
precise measurement of products with small dielectric figure.
The antenna of the radar sensor emits short radar pulses with a
duration of approx. 1 ns. These pulses are reflected by the product
and received by the antenna as echoes. The running time of the radar
pulses from emission to reception is proportional to the distance and
hence to the level. The determined level is converted into an
appropriate output signal and outputted as measured value.
Two-wire electronics 4 ... 20 mA/HART for power supply and
measured value transmission over the same cable.
The supply voltage range can differ depending on the instrument
version.
The data for power supply are specified in chapter "Technical data".
The backlight of the indicating and adjustment module is powered by
the sensor. Prerequisite is a certain level of supply voltage.
The data for power supply are specified in chapter "Technical data".
3.3 Operation
LEVEL TRANSMITTER 8137 can be adjusted with different adjust-
ment media:
with indicating and adjustment module
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with the suitable Bürkert DTM in conjunction with an adjustment
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software according to the FDT/DTM standard, e.g. PACTware and
PC
with manufacturer-specific adjustment programs AMS™ or PDM
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3 Product description
9