Siemens SITRANS F M Intermag 2, Руководство по эксплуатации

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Operation
5-24
SITRANS FM Intermag 2 Flow Transmitter
Operating Manual - A5E00102775-03
Electrode check
Menu item 2.2 The electrode DC voltage is scanned cyclically after selecting this
menu item and is checked for plausibility. This detects deposits on the
electrodes for example. If there is a fault or an error, the alarm signal
’Flow measurement unreliable’ is triggered.
Note!
This function assumes a sensor with SmartPLUG!
Empty Tube Det.
menu item 2.3 The function checks whether the electrodes of the sensor are wetted
by the medium. To do this, you have to determine the interval between
two monitorings.
If the electrodes have no contact with the medium, an alarm signal
(tube empty) is triggered through the digital outputs. This alarm is also
triggered in the case of an insulating coating on the electrodes.
!
Warning!
This message does not mean that the tube has actually run
empty. Therefore you must make sure that the pipeline is
actually empty before your remove the tube or the electrodes!
Note!
This function is conditional upon a minimum conductivity of the
medium of 50
µ
S/cm!
This function assumes a sensor with SmartPLUG!
Response threshold and timing behavior of the ”immersion
check” function depend on the conductivity of the medium and
the nominal width and cladding of the sensor. The switching
threshold can be adapted to these conditions if necessary (see
menu item
6.7.5 ).