Siemens SITRANS LR 300, Instruction Manual, Page: 103 / 140

7ML19985CL02 SITRANS LR 300 – INSTRUCTION MANUAL Page 101
mm
mmm
Appendix III
Appendix III
Ambient/Operating Temperature Specification
The chart above is provided for guidance only.
Where the chart does not apply, please use your own judgement regarding the use of the
SITRANS LR 300. Parameter P343 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. The maximum allowable internal temperature (P343) is 81
o
C.
P343 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 (P343) to gauge the extent of change required to the
installation in order to provide a reliable thermal-operating zone for the SITRANS LR 300.
WARNING: Internal temperature must not exceed 81
o
C! Warranty
may be void.
M a x im u m F la n g e a n d P ro c e s s T e m p e ra tu re s v e rs u s A llo w a b le A m b ie n t
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
-4
0
-3
0
-2
0
-1
0
0
10 20 30 40 50 60 70 80 90
100 110 120 130 140 150 160 170 180 190 200
P ro c e ss, F l a n g e S u rfa c e T e m p e ra tu re °C
Ambie
n
t Te
mpe
ra
tur
e
°C
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
Ambie
n
t Te
mpe
ra
tur
e
°C
F la n g e T e m p e r a tu re
P r o c e s s T e m p e r a tu r e
Ambient Temperature
(Surrounding Enclosure
Volume)
Flange Temperature
Process Temperature
Internal Enclosure
Temperature (P343)
• The chart does not represent every
possible process connection
arrangement. For example, it will
NOT apply if you are mounting the
SITRANS LR 300 on a nozzle greater
than 8” nominal, or directly on a
metallic tank surface.
• The chart does not take into
consideration heating from direct
sunshine exposure.
SITRANS LR 300.book Page 101 Monday, June 10, 2002 7:18 PM