Unit Repair And Excluded Liability - Siemens sitrans LR 400 Instruction Manual And Users Manual

Possible fault messages:
Function Message
MW cable
defective
Sensor
defective
Sensor
Check antenna
Sensor too hot
Electronics all messages
Software all messages
No valid meas.
value
Tank empty
Application
detected
false param.
<Parameter to
Parameters
be corrected>
Service (various)
1. Make the following modifications, starting with
a. Check whether the fault still occurs after every step.
b. Check the set measuring range and the deadband (Parameter 4.2.2.3).
c. Check whether the filling speed has been correctly set (Parameter 4.2.2.5).
d. Reduce the reflectivity (Parameter 4.2.2.6).
e. Switch off the automatic fixed target detection (Parameter 4.2.3.6) if necessary.
f. Switch off the multiple echo detection (Parameter 4.2.3.2) if necessary.

Unit Repair and Excluded Liability

All changes and repairs must be done by qualified personnel and applicable safety
regulations must be followed. Please note the following:
• The user is responsible for all changes and repairs made to the device.
• All new components must be provided by Siemens Milltronics Process
Instruments Inc.
• Restrict repair to faulty components only
• Do not re-use faulty components.
7ML19985FH04
Possible causes
Microwave cable not connected or line
break
Overtemperature in device
Antenna contaminated, damaged or not
mounted
Sensor temperature exceeds 85 °C
Internal fault
Internal fault
fault in fixed target detection, fault in
multiple echo detection, poorly
reflecting measuring medium
vessel is empty (only when sensor
parameter vessel empty detection
active)
incompatible parameters entered,
e. g.: URV = LRV
False parameterization
SITRANS LR 400 – INSTRUCTION MANUAL
Remedy
Contact your Siemens
Milltronics
representative
Contact your Siemens
Milltronics
representative
Check the antenna
Check the max.
permissible ambient
and process
temperature
Contact your Siemens
Milltronics
representative
Contact your Siemens
Milltronics
representative
1 (see below)
Deactivate vessel
empty detection if
necessary
Correct the parameters
listed in the next
function
Perform the correction
as indicated
For service personnel
only
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