Technical data Deltabar FMD71, FMD72
130 Endress+Hauser
15.6.2 Process temperature range for devices with metallic process
isolating diaphragm FMD72
Device Limits
Process connections with internal process isolating
diaphragm
–40 to +125 °C (–40 to +257 °F)
Process connections with flush-mounted process isolating
diaphragm
–40 to +100 °C (–40 to +212 °F)
Hygienic process connections with flush-mounted process
isolating diaphragm
–40 to +130 °C (–40 to +266 °F)
For a maximum of 60 minutes: +150 °C (+302 °F)
15.6.3 Pressure specifications
L
WARNING
The maximum pressure for the measuring device depends on the lowest-rated
element with regard to pressure.
‣
For pressure specifications, see the "Measuring range" section and "Mechanical
construction" section in the Technical Information.
‣
MWP (maximum working pressure): The MWP (maximum working pressure) is
specified on the nameplate. This value refers to a reference temperature of
+20 °C (+68 °F) and may be applied to the device for an unlimited time. Observe
temperature dependency of the MWP. The pressure values permitted at higher
temperatures can be found in the standards EN 1092-1: 2001 Tab. 18 (With regard to
their stability-temperature property, the materials 1.4435 and 1.4404 are grouped
together under 13EO in EN 1092-1 Tab. 18. The chemical composition of the two
materials can be identical.), ASME B 16.5a – 1998 Tab. 2-2.2 F316, ASME B 16.5a –
1998 Tab. 2.3.8 N10276, JIS B 2220.
‣
The test pressure corresponds to the overload limit of the individual sensors
(overpressure limit OPL = 1.5 x MWP (formula does not apply to the FMD72 with a 40
bar (600 psi) measuring cell)) and may be applied for a limited period only to ensure
that no lasting damage occurs.
‣
The Pressure Equipment Directive (EC Directive 97/23/EC) uses the abbreviation "PS".
The abbreviation "PS" corresponds to the MWP (maximum working pressure) of the
measuring device.
‣
In the case of sensor range and process connections where the over pressure limit
(OPL) of the process connection is smaller than the nominal value of the sensor, the
device is set at the factory, at the very maximum, to the OPL value of the process
connection. If you want to use the entire sensor range, select a process connection with
a higher OPL value (1.5 x PN; MWP = PN).
‣
Devices with ceramic process isolating diaphragm: Avoid steam hammering! Steam
hammering can cause zero point drifts. Recommendation: Residue (such as
condensation or drops of water) can remain at the process isolating diaphragm after
CIP cleaning and lead to local steam hammering if immediately steam is introduced. In
practice, drying the process isolating diaphragm (e.g. by blowing) has proved to prevent
steam hammering.
15.7 Additional technical data
See Technical Information.
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