Cerabar M, Deltapilot M
Installation
Hauser
19
4.4.2
Installation instructions for devices with diaphragm seals –
PMP55
• Cerabar M devices with diaphragm seals are screwed in, flanged or clamped, depending
on the type of diaphragm seal.
• Please note that the hydrostatic pressure of the liquid columns in the capillaries can
cause zero point shift. The zero point shift can be corrected.
• Do not clean or touch the process membrane of the diaphragm seal with hard or pointed
objects.
• Do not remove the protection on the process membrane until just before installation.
NOTICE
Improper handling!
Damage to the device!
‣
A diaphragm seal and the pressure transmitter together form a closed, oil-filled cali-
brated system. The fill fluid hole is sealed and may not be opened.
‣
If a mounting bracket is used, sufficient strain relief must be ensured for the capillaries
in order to prevent them from buckling (bending radius ≥ 100 mm (3.94 in)).
‣
Please observe the application limits of the diaphragm seal filling oil as detailed in the
Technical Information for Cerabar M TI00436P, "Planning instructions for diaphragm
seal systems" section.
NOTICE
In order to obtain more precise measurement results and to avoid a defect in the
device, mount the capillaries as follows:
‣
Vibration-free (in order to avoid additional pressure fluctuations)
‣
Not in the vicinity of heating or cooling lines
‣
Insulate if the ambient temperature is below or above the reference temperature
‣
Mount with a bending radius ≥ 100 mm (3.94 in)!
‣
Do not use the capillaries as a carrying aid for the diaphragm seals!
Vacuum applications
Installation instructions
For vacuum applications, pressure transmitters with a ceramic measuring membrane (oil-
free) are preferable.
For applications under vacuum, Hauser recommends mounting the pressure
transmitter below the diaphragm seal. This prevents a vacuum load on the diaphragm seal
caused by the presence of fill fluid in the capillary.
When the pressure transmitter is mounted above the diaphragm seal, the maximum
height difference H1 in accordance with the following illustrations must not be exceeded.
The following illustration shows installation above the lower diaphragm seal:
H1
A0023994