Cerabar M, Deltabar M, Deltapilot M / 4...20 mA HART Installation
Endress+Hauser 13
Vacuum application
For applications under vacuum, Endress+Hauser recommends mounting the pressure transmitter
below the diaphragm seal. This prevents vacuum loading of the diaphragm seal caused by the
presence of filling oil in the capillaries.
When the pressure transmitter is mounted above the diaphragm seal, the maximum height
difference H1 in accordance with the illustration below left must not be exceeded. The maximum
height difference depends on the density of the filling oil and the smallest ever pressure that is
permitted to occur at the diaphragm seal (empty container), see illustration below right.
Mounting with temperature isolator
P01-PMx5xxxx-11-xx-xx-xx-008
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. 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 zero point shift of approx. 21 mbar (0.315 psi)
due to the hydrostatic column in the temperature isolator. You can correct this zero point shift.
ä 40 "Function of the operating elements" or ä 56, Section 6.4 "Position zero adjustment".
P01-PMx5xxxx-11-xx-xx-xx-006
Fig. 9: Installation above the diaphragm
seal
P01-PMP75xxx-05-xx-xx-en-011
Fig. 10: Diagram of maximum installation height above the
diaphragm seal for vacuum applications, depending on
the pressure at the diaphragm seal
0.0
2.0
4.0
6.0
8.0
10.0
12.0
50 100 300 400 500 600 700 800 900 1000
200
Inert oil
High temperature
oil
Vegetableoil
Silicone oil
Pressure at diaphragm seal[mbar
abs
]
Heightdifference H1 [m]
Low temperature oil
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