7
Maintenance and troubleshooting
Maintenance:
Please take all measures in due time which will guarantee the safety of operation and reliability
of the entire measuring system.
Maintenance of CLM 223 / 253 comprises:
• Calibration (see chap. 5.10)
• Cleaning of assembly and sensor
• Checking of cables and connections
Troubleshooting
Determination and elimination of the cause of the problem in the case of an operating fault.
Troubleshooting refers to measures that can be performed without intervention in the instrument
(for instrument defects, see chap. 8, Repairs). Troubleshooting of the CLM 223/253 and the
measuring system is performed with the aid of the troubleshooting table in chap. 7.1.
Warning:
•
When working on the device, bear
in mind the possible
repercussions on the process
controller or the process itself.
•
When removing the sensor during
maintenance or calibration, please
consider potential hazards due to
pressure, high temperatures and
contamination.
Note:
•
Please contact you E+H support
office if you have any queries. You
also send your queries to the E+H
Service Organization via the
Internet.
www.endress.com
7.1
Troubleshooting common problems
Error
Possible cause
Remedy
Equipment need, spare parts,
information
Instrument cannot be
operated, value 9999
– Operation locked
Press simultaneously the CAL and
MINUS keys
See chap. 4.3
Display value 0.0,
and error message
E008 “Sensor”
and display —— in A4
– Sensor / sensor cable defective
Test with new or with different
functional sensor
CUS 31 or 41 sensor (either type is
suitable for rough function test)
– Instrument input defective
Replace MKT1 module for testing
S. spare parts list in chap. 8.2.4/8.3.4
– Break in sensor extension line
Check junction boxes and line.
Check sensor supply.
Measuring point test in chap. 8.6.1
– Data transfer error
Replace LSGA (AC power supply
unit or L2GD (DC power supply unit)
module for testing
See spare parts list in chap. 8.2.4 /
8.3.4
– Incorrect sensor connection
Check connection
Connection see chap. 3.4 and 3.5
Display value 0.0
– Sensor completely blocked
Clean optics
Use spray cleaning or wiper
Fixed, incorrect
measured value
– Impermissible instrument
operating state (no response to
key actuation)
Switch instrument off and back on
EMV problem: check line routing if
problem persists, check for
possible sources of interference.
Measured value
fluctuates
– Measuring cable interference
Connect cable screen acc. to
connection diagram (not
grounding)
See chap. 3.4 and 3.5
– Signal output line interference
– check line routing,
– try separate line routing,
grounding screen to SPS/PLS
Separate signal output, meas.
input and supply lines
– Irregular flow rate / turbulence /
air bubbles / big solids particles
Choose better place of installation
or eliminate turbulences.
Possibly use large measured value
damping factor.
Measured value damping see
field A5
Maintenance and troubleshooting
Liquisys M CUM 223 / 253
56
Hauser
