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Pressure and Temperature Considerations
The maximum temperature and pressure of operation for the standard SITRANS LC 500
level probe is 200C (392F) and 200 bar (2900 psi). Please consult the pressure curve on
page 19 for qualifications that must be applied to these maximums.
Enamel probes are recommended when the process temperature exceeds 200 C, and/or
in combination with very high pressure.
Note: Consult your Siemens Milltronics representative if the material to be
measured may be incompatible with the SITRANS LC500 materials of
construction.
Temperature Versus Pressure Curve for SITRANS LC500 PFA-insulated Level
Probe
As the temperature approaches 75C (167F), the maximum pressure must be derated
When the temperature reaches 200C (392F), the maximum pressure is limited to 50 bar
(725 psi). This curve is typical for water only. For other, more aggressive chemicals the
derating curve will be more severe.
o
–100
C
o
(–148
F)
Reference Product: Water
Notes:
•
For high temperature and pressure ratings for the Enamel probe, please
contact your Siemens Milltronics representative.
1.
Decreased within the limits specified in the diagram (maximum 200 bar).
7ML19985GE04
200 bar (2920 psi)
150 bar (2190 psi)
100 bar (1460 psi)
70 bar (1022 psi)
50 bar (725 psi)
–1bar (–
14.6 psi)
o
o
o
–50
C
0
C
50
C
o
o
o
(–58
F)
(32
F)
(122
F)
SITRANS LC500 – OPERATING INSTRUCTIONS
o
70
C
o
(158
F)
o
o
100
C
150
C
o
o
(212
F)
(302
F)
(392
consult factory when pressure or
temperatures fall within this area
temperature
o
200
C
o
F)
Page 19
1
.
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