RIA15
2 Endress+Hauser
Function and system design
Measuring principle
The RIA15 process display unit is integrated in the 4 to 20 mA or HART
®
loop and transmits the
measuring signal or HART
®
process variables in digital form. The process display unit does not
require an external power supply. It is powered directly from the current loop.
The device meets the requirements of the HART® Communication Protocol Specifications and can be
used with devices with HART
®
Revision ≥ 5.0.
The LC display is easy to read even in bright sunlight and enables 5-digit, scalable measured value
display. In addition to measured value display, the associated value dimension and a bar graph can
be easily configured with simple 3-key operation.
The device can also be operated with backlighting where necessary. In such cases pay attention to
the higher voltage drop.
When used in conjunction with the Micropilot FMR20 radar level sensor, the RIA15 unit can also be
used to make the basic settings for the Micropilot FMR20. The RIA15 must be ordered with the
relevant option for FMR20 basic setting in this case.
Measuring system
A0018915-EN
1 RIA15 as field and panel display
Input
Voltage drop
Standard device with 4 to 20 mA communication ≤ 1.0 V
Device with HART
®
communication ≤ 1.9 V
Display lighting additionally 2.9 V
HART
®
input impedance
Rx = 40 kΩ
Cx = 2.3 nF
Measured variable
The input variable is either the 4 to 20 mA current signal or the HART
®
signal.
HART
®
signals are not affected.
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