Manual

Code
Text mes-
sage
Cause Rectification
M505
No echo
available
l Level echo can no longer
be detected
l Clean the antenna
l Use a more suitable an-
tenna/sensor
l Remove possible false
echoes
l Optimize sensor position
and orientation
9.4 Remo
ve interferences
The first measures are:
l Evaluation of fault messages via the indicating and adjustment
module
l Checking the 4 … 20 mA signal
l Treatment of measurement errors
Further comprehensive diagnosis possibilities are offered by a PC with
the software PACTware and suitable DTM.
In many case, the failure reasons can thus be determined and faults
rectified.
Connect a handmultimeter in the suitable measuring range according
to the wiring plan. The following table describes possible errors in the
current signal and helps to remove them:
Error Cause Rectification
4 … 20 mA signal
not
stable
l Level fluctua-
tions
l Set damping according to the in-
strument via the indicating and
adjustment module or PACTware/
DTM
4 … 20 mA signal
missing
l Electrical con-
nection faulty
l Check connection according to
chapter "Connection steps" and if
necessary, correct according to
chapter "Wiring plan".
l Voltage supply
missing
l Check cables for breaks; repair if
necessary
l Operating volt-
age too low or
load resist-
ance too high
l Check, adapt if necessary
Current signal
greaterthan 22 mA
or less than
3.6 mA
l Electronics
module in the
sensor defec-
tive
l Exchange the instrument or send it
in for repair
Procedu
re for fault rec-
tification
Check
the 4 … 20 m A
signal
LEVEL TRANSMITTER 8136 • 4 … 20 mA/HART - two-wire 53
9 Diagnosis, Asset Management and service
41783-EN-120316