Endress+Hauser Waterpilot FMX21, Руководство по эксплуатации

Страница: 140 / 144

Technical data Waterpilot FMX21
140 Hauser
16.5.3 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 the "Mechanical
construction" section.
‣
The measuring device must be operated only within the specified limits!
‣
The Pressure Equipment Directive (2014/68/EU) uses the abbreviation "PS". The
abbreviation "PS" corresponds to the MWP (maximum working pressure) of the
measuring device.
‣
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 the
temperature dependency of the MWP.
‣
OPL (Over Pressure Limit): The overpressure limit is the maximum pressure a device
may be subjected to during a test. It is greater than the maximum working pressure by
a certain factor. In the case of sensor range and process connection combinations
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.
‣
Avoid steam hammering! Steam hammering can cause zero point drift.
Recommendation: Residue (such as condensation or drops of water) can remain on the
process membrane after CIP cleaning and lead to local steam hammering if steam
cleaning is performed again. In practice, drying the process membrane (e.g. by blowing
off excess moisture) has proven to be a successful way of avoiding steam hammering.
16.6 Additional technical data
See Technical Information TI00431P.