Endress+Hauser Cerabar M PMC51 Brief Operating Instructions page 13

Cerabar M PMC51, PMP51, PMP55
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 calibrated
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
See Operating Instructions.
Mounting with temperature isolator
See Operating Instructions.
Heat insulation
See Operating Instructions.
4.4.3 Seal for flange mounting
NOTICE
Corrupted measurement results.
The seal is not allowed to press against the process isolating diaphragm as this could affect
the measurement result.
‣
Ensure that the seal is not touching the process isolating diaphragm.
Endress+Hauser
Installation
13