Cerabar PMP71B HART
Installation
Hauser
17
5.1.4
Installation instructions for devices with diaphragm seals
NOTICE
Incorrect 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 filling
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 operating limits of the diaphragm seal 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. If a measuring cell with a small measuring
range is selected, a position adjustment can cause the sensor to go over range (position
adjustment due to zero point offset, caused by the orientation of the fill fluid liquid
column). Perform zero point adjustment if necessary.
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 against
direct sunlight.
More detailed installation instructions are provided in the Applicator
Vacuum application
For vacuum applications, pressure transmitters with a ceramic process isolating diaphragm
(oil-free) are preferable.
For applications under vacuum, mount the pressure transmitter below the diaphragm seal.
This prevents additional vacuum loading of the diaphragm seal caused by the presence of
the fill fluid in the capillary.
If the pressure transmitter is installed above the diaphragm seal, do not exceed the
maximum height difference h1. The height difference h1 is displayed in the Applicator
Summary of Contents for Hart Cerabar PMP71B
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