Exchanging The Cable/Rod - Siemens SITRANS LG250 Operating Instructions Manual
Guided wave radar
4...20 ma/hart - two-wire
rod and cable probe
with sil qualification
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Also See for SITRANS LG250:
- Operating instructions manual (92 pages) ,
- Operating instructions manual (88 pages) ,
- Operating instructions manual (76 pages)
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Exchanging the cable/rod
PBD-51041388
Order the replacement electronics module through the agency
serving you. The electronics modules are adapted to the respective
sensor.
It is absolutely necessary that the factory settings of the sensor are
loaded into the electronics module. Therefore please state the serial
number of the sensor when ordering the replacement electronics
module.
The serial numbers are stated on the type label of the instrument,
inside the housing or on the delivery note.
The replacement electronics module is provided with the serial
number of the appropriate sensor. Check if the serial number on the
replacement electronics module and the serial number of the sensor
correspond.
All user-specific settings must be entered again. Hence, you have to
carry out a new setup after the electronics exchange.
If you have stored the data of the parameter adjustment during the
first setup of the sensor, you can transfer these to the replacement
electronics module. A new setup is no more necessary.
After the new setup and the transfer of the parameterization date, you
have to verify the parameters. Only then, the instrument will be ready
for operation, again.
10.6 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.
1. Loosen the rod or cable with a fork wrench applied to the flat
surface, provide counterforce with another fork wrench.
2. Dry the process fitting and the upper rod end before unscrewing
the measuring rod.
3. Unscrew the loosened rod or cable manually.
4. Insert the new measuring rod carefully by hand with a screwing
motion into the opening of the process fitting.
5. Continue screwing in the rod manually into the opening of the pro-
cess fitting.
6. Exert counterforce with the second fork spanner and tighten the
rod or cable on the flat surfaces with the following torque.
Rod ø 8, cable ø 2 and 4: 6 Nm (4.43 lbf ft)
Rod ø 12: 10 Nm (7.37 lbf ft)
SITRANS LG250 - Operating Instructions
69
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