Micropilot FMR60/62/67
28 Endress+Hauser
Appendix
Structure of the measuring
system
System components
The measuring system's devices are displayed in the following diagram (example):
A0028746
1 PLC (programmable logic controller)
2 Transmitter power supply unit, e.g. RN221N (with communication resistor)
3 Connection for Commubox FXA191, FXA195 and Field Communicator 375, 475
4 Field Communicator 475
5 Computer with operating tool (e.g. FieldCare, AMS Device Manager, SIMATIC PDM)
6 Commubox FXA191 (RS232) or FXA195 (USB)
7 Field Xpert SFX350/SFX370
8 VIATOR Bluetooth modem with connecting cable
9 Transmitter
An analog signal (4 to 20 mA) in proportion to the level is generated in the transmitter. This is sent
to a downstream logic unit (e.g. PLC, limit signal transmitter, ...)where it is monitored to determine
whether it is below or above a specified limit value.
For fault monitoring, the logic unit must recognize both HI-alarms (≥21.0 mA) and LO-alarms
(≤3.6 mA).
Description of use as a protective system
The Micropilot is a "downward-looking" measuring system, operating based on the time-of-flight
method (ToF). The distance from the reference point (process connection of the measuring device)
to the product surface is measured. High-frequency pulses are emitted via an antenna. The pulses
are reflected by the product surface, received by the electronic evaluation unit and converted into
level information. This method is also known as level-radar.
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