Deltabar PMD78B PROFINET with Ethernet-APL Mounting
Endress+Hauser 17
5.1.3 Installation instructions for devices with diaphragm seals
NOTICE
Improper handling!
Damage to the device!
‣
The diaphragm seal and pressure transmitter form a closed, calibrated system which
has been filled with diaphragm seal fill fluid. Never open any of the holes for fill fluid.
‣
Ensure strain relief to prevent the capillary from bending (bending radius ≥
100 mm (3.94 in)).
‣
Do not use capillaries as a carrying aid for the diaphragm seals.
‣
Observe the application limits of the fill fluid.
General information
In the case of devices with diaphragm seals and capillaries, the zero point shift caused by
the hydrostatic pressure of the filling liquid column in the capillaries must be taken into
account when selecting the measuring cell. Perform zero adjustment if necessary. If a
measuring cell with a small measuring range is selected, a position adjustment can cause
the measuring cell to go over range (position adjustment due to zero point offset, caused
by the orientation of the fill fluid liquid column).
For devices with a capillary, use a suitable bracket (mounting bracket) for mounting.
When mounting, sufficient strain relief must be provided for the capillary to prevent the
capillary from bending (capillary bending radius ≥ 100 mm (3.94 in)).
Mount the capillary so that it is vibration-free (in order to avoid additional pressure
fluctuations).
Do not mount capillaries in the vicinity of heating or cooling lines and protect them
against direct sunlight.
More detailed installation instructions are provided in the Applicator
"Sizing Diaphragm Seal".
Vacuum applications
In vacuum applications, mount the pressure transmitter below the diaphragm seal. This
prevents additional vacuum loading of the diaphragm seal caused by the presence of fill
fluid in the capillary.
If the pressure transmitter is mounted above the diaphragm seal, do not exceed the
maximum height difference h1. The height difference h1 is shown in the Applicator
"Sizing Diaphragm Seal".
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