Endress+Hauser Proline Promass E 500 - Page 144

Commissioning Proline Promass E 500 PROFIBUS PA
144 Endress+Hauser
Zero verification and zero adjustment cannot be performed if the following process
conditions are present:
• Gas pockets
Ensure that the system has been sufficiently flushed with the medium. Repeat flushing
can help to eliminate gas pockets
• Thermal circulation
In the event of temperature differences (e.g. between the measuring tube inlet and
outlet section), induced flow can occur even if the valves are closed due to thermal
circulation in the device
• Leaks at the valves
If the valves are not leak-tight, flow is not sufficiently prevented when determining the
zero point
If these conditions cannot be avoided, it is advisable to keep the factory setting for the zero
point.
Zero point verification
The zero point can be verified with the Zero verification wizard.
Navigation
"Setup" menu → Advanced setup → Sensor adjustment → Zero verification
‣
Zero verification
Process conditions
→  144
Progress
→  144
Status
→  145
Additional information
→  145
Recommendation:
→  145
Root cause
→  145
Abort cause
→  145
Zero point measured
→  145
Zero point standard deviation
→  145
Parameter overview with brief description
Parameter Description Selection / User interface Factory setting
Process conditions Ensure process conditions as follows. • Tubes are completely filled
• Process operational pressure
applied
• No-flow conditions (closed
valves)
• Process and ambient
temperatures stable
–
Progress Shows the progress of the process. 0 to 100 % –