7ML19985GE04
SITRANS LC500 – OPERATING INSTRUCTIONS
Page 19
P
robe Configur
at
io
n
Pressure and Temperature Considerations
The maximum temperature and pressure of operation for the standard SITRANS LC 500
level probe is 200
C (392
F) 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.
Temperature Versus Pressure Curve for SITRANS LC500 PFA-insulated Level
Probe
As the temperature approaches 75
C (167
F), the maximum pressure must be derated
1
.
When the temperature reaches 200
C (392
F), 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.
Note: Consult your Siemens Milltronics representative if the material to be
measured may be incompatible with the SITRANS LC500 materials of
construction.
1.
Decreased within the limits specified in the diagram (maximum 200 bar).
Notes:
•
For high temperature and pressure ratings for the Enamel probe, please
contact your Siemens Milltronics representative.
Reference Product: Water
100
o
C
(212
o
F)
–100
o
C
(–148
o
F)
0
o
C
(32
o
F)
50
o
C
(122
o
F)
150
o
C
(302
o
F)
200
o
C
(392
o
F)
–50
o
C
(–58
o
F)
70
o
C
(158
o
F)
temperature
pr
ess
u
re
200 bar (2920 psi)
150 bar (2190 psi)
100 bar (1460 psi)
70 bar (1022 psi)
–1bar (–
14.6 psi)
consult factory when pressure or
temperatures fall within this area
50 bar (725 psi)
