Levelflex M FMP40
Endress+Hauser 33
Interface electronics version
The device with the "Interface" electronics version makes it possible to measure the total level and the interface
level simultaneously. The resulting process variables are output using the dynamic variables of the HART
protocol. The process variables can be flexibly assigned to the dynamic variables (primary, secondary, tertiary,
quaternary value).
Using the HART loop converter HMX50
The dynamic variables of the HART protocol can be converted into individual 4 to 20 mA sections using the
HART Loop Converter HMX50. The variables are assigned to the current output and the measuring ranges to
the individual parameters in the HMX50.
L00-FMP40xIx-04-00-00-en-004
Connection diagram for HART loop converter HMX50
(example: passive 2-wire device and current outputs connected as power source)
The HART loop converter HMX50 can be acquired using the order number 71063562.
Additional documentation: TI00429F/00/EN and BA00371F/00/EN.
Dynamic variables of the
HART protocol
Possible process variable assignment Comment
Primary Value • Interface
•Total level
• Thickness of the upper layer
The "primary value" is permanently
assigned to the 4 to 20 mA current
output
Secondary Value • Interface
•Total level
• Thickness of the upper layer
-
Tertiary Value • Interface
•Total level
• Thickness of the upper layer
• Amplitude of the total level signal
-
Quaternary (4
th
) Value Amplitude of the interface level signal No variable assignment
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