Maximum Process Temperature Chart - Siemens SITRANS LR250 Instruction Manual

Maximum Process Temperature Chart

The chart below is for guidance only:
Note:
.
Maximum Flange and Process Temperatures versus Allowable Ambient for
Polypropylene Rod or Flange Adapter versions of SITRANS LR250
Graphic to be revised if required.
• The chart does not represent every
possible process connection
arrangement. For example, it will
NOT apply if you are mounting
SITRANS LR250 on a nozzle greater
than 8" nominal, or directly on a
metallic vessel surface.
• The chart does not take into
consideration heating from direct
sunshine exposure.
Where the chart does not apply, please use your own judgement regarding the use of
SITRANS LR250. Parameter 3. 1 4. 1 is required to monitor the Internal Temperature. It gives you an
excellent indication of how reliably the product will perform thermally when installed on your
process vessel.
3. 1 4. 1 also allows you to decide whether or not attention should be focussed on
redesigning the installation. For example, if the internal temperature exceeds the
maximum allowable limit, a sun shield or a longer nozzle may be required. Engineering will
use this temperature reading (3. 1 4. 1 ) to gauge the extent of change required to the
installation in order to provide a reliable thermal-operating zone for the SITRANS LR250.
WARNING: Internal temperature must not exceed 80 °C (176 °F).
7ML19985JE01
polypropylene
rod
temperature
(no flange)
Process Flange Surface Temperature (
internal
enclosure
temperature
SITRANS LR250 (HART) – INSTRUCTION MANUAL
flange process
temperature temperature
o
C)
ambient
temperature
process
temperature
Page 111