Endress+Hauser Cerabar M - Page 19

Cerabar M, Deltabar M, Deltapilot M Installation
Endress+Hauser 19
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). For the temperature
application limits, see technical Information, "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.
The temperature restrictions are lowest with an insulation height of 30 mm (1.18 inch).
Full insulation exhibits virtually the same behavior as no insulation!
The temperature limits with an insulation height of 30 mm (1.18 inch) are illustrated in the
following graphic.
A0031354
Fig. 11:
A Ambient temperature:
 85 °C (185 °F)
B Process temperature: max. 400 °C (752 °F), depending on the filling oil used
C Device with temperature isolator, material 316L (1.4404)
D Without isolation
E Maximum isolation
F 30 mm (1.18. inch) isolation
G Without isolation, maximum isolation, 30 mm (1.18. inch) isolation
1 Isolation heigth 30 mm (1.18. inch)
2Isolation material
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
B
1
2
A
DE FG
C
B