Cerabar M PMC51, PMP51, PMP55
116 Endress+Hauser
The range of application can be extended by using a fill fluid with a smaller expansion coefficient
and a shorter capillary.
Cleaning instructions
Endress+Hauser offer flushing rings as accessories to clean process isolating diaphragms without
taking the transmitters out of the process.
For further information please contact your local Endress+Hauser Sales Center.
We recommend you perform CIP (cleaning in place (hot water)) before SIP (sterilization in place
(steam)) for pipe diaphragm seals. A frequent use of sterilization in place (SIP) will increase the
stress on the process isolating diaphragm. Under unfavorable circumstances in the long term view
we cannot exclude that a frequent temperature change could lead to a material fatigue of the process
isolating diaphragm and possibly to a leakage.
Installation instructions Diaphragm seal systems
• A diaphragm seal together with the transmitter form a closed, calibrated system, which is filled
through openings in the diaphragm seal and in the transmitter's measurement system. These
openings are sealed and must not be opened.
• 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 range violation.
• For devices with a temperature isolator or capillary, a suitable fastening device (mounting bracket)
is recommended.
• When mounting, sufficient strain relief must be provided for the capillary line to prevent the
capillary from bending (capillary bending radius ≥ 100 mm (3.94 in)
Capillary
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
• With a bending radius ≥ 100 mm (3.94 in)
Thermal insulation
The PMP55 may only be insulated up to a certain height. The maximum permitted insulation height
is indicated on the devices and applies to an insulation material with a heat conductivity ≤ 0.04
W/(m x K) and to the maximum permitted ambient and process temperature. The data were
determined under the most critical application "quiescent air". Maximum permitted insulation height,
here indicated on a PMP55 with a flange:
A0020474
A Ambient temperature ≤ 70 °C (158 °F)
B Process temperature
1 Maximum permitted insulation height
2 Insulation material
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