Endress+Hauser Micropilot FMR20, Operating Instructions Manual, Page: 40 / 102

Diagnostics and troubleshooting Micropilot FMR20 HART
40 Hauser
10 Diagnostics and troubleshooting
10.1 General errors
Error Possible cause Solution
Device does not respond Supply voltage does not match the
specification on the nameplate Apply correct voltage
The polarity of the supply voltage
is wrong Correct the polarity
The cables do not contact the
terminals properly Ensure electrical contact between the cable
and the terminal
HART communication does
not function Communication resistor missing or
incorrectly installed Install the communication resistor (250 Ω)
correctly
Commubox is connected
incorrectly Connect Commubox correctly
The communication resistor of the
Commubox is switched on or off Check the communication resistor and
connections

For details, see Technical Information
TI00404F
Device measures incorrectly Configuration error • Check and correct the parameter
configuration
• Carry out mapping
Display values not plausible
(linearization) SmartBlue and FieldCare/
DeviceCare active at the same time Log off FieldCare/DeviceCare and disconnect
or
Log off SmartBlue and disconnect
(connection via SmartBlue has priority)
Linearized output value not
plausible Linearization error SmartBlue: Check linearization table
FieldCare/DeviceCare: Check linearization
table
Check the vessel selection in the
linearization module
RIA15 no display The polarity of the supply voltage
is wrong Correct the polarity
The cables do not contact the
terminals properly Ensure electrical contact between the cable
and the terminal
RIA15 defective Replace RIA15
RIA15 start sequence keeps
running through Supply voltage too low • Increase supply voltage
• Switch off backlight
10.2 Error - SmartBlue operation
Error Possible cause Solution
Device is not visible in
the live list No Bluetooth
connection Enable Bluetooth function on smartphone or tablet
Bluetooth function of sensor disabled, perform recovery sequence
Device is not visible in
the live list The device is
already connected
with another
smartphone/
tablet Only one point-to-point connection is established between a
sensor and a smartphone or tablet