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SITRANS LR250 (FF) – QUICK START MANUAL
7ML19985XN82
mm
mm
m
E
n
glis
h
Maintenance
SITRANS LR250 requires no maintenance or cleaning under normal operating conditions.
Under severe operating conditions, the antenna may require periodic cleaning. If cleaning
becomes necessary:
• Note the antenna material and the process medium, and select a cleaning solution that
will not react adversely with either.
• Remove the instrument from service and wipe the antenna clean using a cloth and
suitable cleaning solution.
Unit Repair and Excluded Liability
For detailed information, please see the inside back cover.
Antenna or electronics/enclosure replacement
• If the antenna requires replacement due to damage or failure, it may be replaced without
the need for re-calibration.
• Changing to a different antenna type may be performed by a Siemens authorized repair
center or personnel.
• If the electronics or enclosure require replacement due to damage or failure, please
ensure the correct antenna version is used, otherwise a re-calibration will need to be
performed by Siemens authorized personnel.
Maximum Process Temperature Chart
Flange Adapter versions of SITRANS LR250
.
WARNING: Internal temperature must not 80 °C (+176 °F).
Notes:
• The chart is for guidance only and does not represent every possible process connection
arrangement. For example, it will NOT apply if you are mounting SITRANS LR250 directly
on a metallic vessel surface.
• It does not take into consideration heating from direct sunshine exposure.
• Use Minimum Value (3.3.1) and Maximum Value (3.3.2) to monitor the internal temperature.
process
temperature
A
m
bi
ent
T
em
per
at
ur
e (
o
C)
Process
Temperature (
o
C)
Maximum Process
Temperatures versus
allowable ambient
