RIA261
2 Endress+Hauser
Function and system design
Measuring principle
Example for field display application area
The display measures an analogue measurement signal and indicates this on the display. The display is con-
nected in a 4 to 20 mA current loop and also derives its supply from the loop. The volt drop is almost negligible
(< 2.5 V). The dynamic internal resistance (load) makes sure that independently from the loop current, the
maximum volt drop is never exceeded. The analogue signal at the input is digitised, analysed and shown in the
rear illuminated display.
Equipment architecture Micro-controller controlled field mounted display with illuminated LC display. Setting up measurement range,
decimal point and offset of the display is easily done on an open unit using the three operational push buttons
fitted. Setting up during operation is possible. The rear illuminated display is always active and needs no further
wiring for its energy requirement.
Input
Measured variable Current
Measuring range 4 to 20 mA (polarity protected)
Electrical specifications • Volt drop (load)
< 2.5 V
• Max. input current (short circuit current)
200 mA
G09-RIA261ZZ-15-00-xx-en-001.eps
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