Endress+Hauser Cerabar M PMC51 - Vacuum Applications

Cerabar M PMC51, PMP51, PMP55
Endress+Hauser 117
Mounting with temperature isolator
Endress+Hauser recommends the use of temperature isolators in the event of constant extreme
medium temperatures which lead to the maximum permissible electronics temperature of
+85 °C (+185 °F) being exceeded. Depending on the filling oil used, diaphragm seal systems with
temperature isolators can be used for maximum temperatures of up to +400 °C (+752 °F) →  115,
"Diaphragm seal filling oils" section. To minimize the influence of rising heat, Endress+Hauser
recommends the device be mounted horizontally or with the housing pointing downwards. The
additional installation height also brings about a maximum zero point shift of 21 mbar (0.315 psi)
due to the hydrostatic column in the temperature isolator. You can correct this zero point shift at the
device.
T
T
T
p
p
p
T T
T
a a
a
A B C
2
2
1
1
1
T
p
T
a
+212
+176+140+104+68+32-4-40-76
+400
+350
+300
+250
+200
+150
+100
+50
0
-50
-100
+752
+662
+572
+482
+392
+302
+212
+122
+32
-58
-148
[°C]
[°F]
[°C][°F]
+100+80+60+40+20
0
-20-40-60
A C B
A0032475
1 Transmitter
2 Insulation material
Position Insulation Ambient temperature (T
a
) at transmitter Maximum process temperature (T
p
)
A No insulation 60 °C (140 °F) 400 °C (752 °F)
1)
85 °C (185 °F) 200 °C (392 °F)
B 30 mm (1.18 in) Insulation 80 °C (176 °F) 400 °C (752 °F)
85 °C (185 °F) 300 °C (572 °F)
C Maximum insulation 67 °C (153 °F) 400 °C (752 °F)
85 °C (185 °F) 200 °C (392 °F)
1) Process temperature: max.400 °C (752 °F), depending on the diaphragm seal filling oil used
Vacuum applications