Cerabar M
Endress+Hauser 25
4...20 mA HART, PROFIBUS PA
Operating conditions (installation)
General installation
instructions
• The position-dependent zero point shift can be corrected directly at the device by means of a key or a
potentiometer. Diaphragm seals also shift the zero point, depending on the installation position
(→ see also Page 65, "Installation instructions, diaphragm seal systems" section).
• Endress+Hauser offers a mounting bracket for installing on pipes. → See also Page 26, "Wall and pipe-
mounting" section.
• The onsite display can be rotated in 90° stages.
• Devices with EHEDG approval: these devices must be installed in accordance with the Hygienic Equipment
Design Criteria to meet the requirements of EHEDG.
• For PMP46, PMP48: see Page 65, "Installation instructions, diaphragm seal system" section.
Measuring arrangement for
devices without a diaphragm
seal – PMC41, PMC45,
PMP41, PMP45
Cerabar M devices without diaphragm seals are mounted as per the norms for a manometer (DIN EN 839-2).
We recommend the use of shutoff devices and siphons. The orientation depends on the measuring application.
Pressure measurement in gases
• Mount Cerabar M with shutoff device above the tapping point so that any condensate can flow into the
process.
Pressure measurement in steam
• Mount Cerabar M with siphon above the tapping point.
The siphon reduces the temperature to almost ambient temperature.
• Fill the siphon with liquid before commissioning.
Pressure measurement in liquids
• Mount Cerabar M with shutoff device below or at the same level as the tapping point.
• Do not mount the device at the following positions:
In the fill curtain, in the tank outlet or at a point in the container which could be affected by pressure pulses
from an agitator or a pump.
Mounting with temperature
isolator
Endress+Hauser recommends the use of temperature isolators in the event of constant extreme fluid
temperatures which lead to the maximum permissible electronics temperature of +85°C (+185°F) being
exceeded.
Depending on the filling oil used, Cerabar M devices with temperature isolators can be used for maximum
temperatures of up to 260°C (+500°F). → For the temperature application limits of filling oils, see Page 60,
"Diaphragm seal filling oil" section.
To minimize the influence of rising heat, Endress+Hauser recommends the device be mounted horizontally or
with the housing pointing downwards.
The additional installation height also brings about a zero point shift of maximum 21 mbar due to the
hydrostatic column in the temperature isolator. You can correct this zero point shift.
P01-PMP4xxxx-11-xx-xx-xx-006
–10...+60 °C
(+14 to +140°F)
–40...–10 °C, +60...+85 °C
(-40 to +14°F, +140 to +185°F)
+85...+125 °C (+185 to +257°F)
(only PMP45)
% of URL/10 K
X ⎯⎯• ±0.08
⎯ X ⎯ • ±0.1
⎯⎯ X•±0.12
PMP46, PMP48: the data apply to the transmitter without a diaphragm seal or capillary line.
max. 115
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