Exchanging The Electronics Module; Exchanging The Cable/Rod - Siemens SITRANS LG250 Operating Instructions Manual

Fault description Cause
Measured value Various echoes from an uneven product
fluctuates around surface, e.g. an extraction funnel
10 ... 20 %
Reflections from the product surface via the
vessel wall (deflection)
0 time
Reaction after fault recti-
fication

Exchanging the cable/rod

PBD-51041053
Depending on the reason for the fault and the measures taken, the
steps described in chapter "Setup" must be carried out again or must
be checked for plausibility and completeness.
9.5

Exchanging the electronics module

If the electronics module is defective, it can be replaced by the user.
In Ex applications, only instruments and electronics modules with ap-
propriate Ex approval may be used.
If there is no electronics module available on site, the electronics
module can be ordered through the agency serving you. The electron-
ics modules are adapted to the respective sensor and differ in signal
output or voltage supply.
The new electronics module must be loaded with the default settings
of the sensor. These are the options:
•
In the factory
•
Or on site by the user
In both cases, the serial number of the sensor is needed. The serial
numbers are stated on the type label of the instrument, on the inside
of the housing as well as on the delivery note.
When loading on site, the order data must first be downloaded from
the Internet (see operating instructions "Electronics module").
Caution:
All application-specific settings must be entered again. That's why you
have to carry out a fresh setup after exchanging the electronics.
If you saved the parameter settings during the first setup of the sen-
sor, you can transfer them to the replacement electronics module. A
fresh setup is then not necessary.
9.6 Exchanging the cable/rod
If necessary, the cable or rod (measuring part) of the probe can be
exchanged.
Loosen the rod or cable with a fork wrench, wrench size 7 (rod ø 8,
cable ø 2 and 4) or wrench size 10 (rod ø 12).
Note:
When exchanging the rod or cable, make sure that the instrument and
the new rod or cable are dry and clean.
SITRANS LG250 - Operating Instructions
Rectification
Check parameter "Material Type" and
adapt, if necessary
Optimize installation position and sensor
orientation
63