Siemens SITRANS FC410, Руководство по эксплуатации, Страница: 143 / 160

FC410 with Modbus
Operating Instructions, 02/2016, A5E33120874-AC
141
Zero point adjustment
C
In the following the automatic zero point adjustment function is described. For further details,
see Zero point adjustment.
Note
Preconditions
Before a zero point adjustment is initiated, the pipe must be flushed, filled and at an absolute
flowrate of zero preferably also at operating pressure and temperature. Refer to appendix
Zero point adjustment for more details.
Note
Change of parameters during zero point adjustment
Do not change any other parameter during the zero point adjustment procedure.
Automatic zero point adjustment
The device measures and calculates the correct zero point automatically.
The automatic zero point adjustment of the flowmeter is set by the following parameters:
● Duration (Modbus address 2135)
● Start Zero Point Adjustment (Modbus address 2180)
When zero adjust is initiated by selecting Start Zero Point Adjustment, the massflow values
are acquired and totalized for the configured period (Duration). The default zero point
adjustment period (30 s.) is normally sufficient for a stable zero point measurement.
Note
Extremely low flow quantity
If the flow quantity is extremely small, extremely precise measurement is necessary. In this
case, a long zero point adjustment period can be selected for improved zero point
adjustment.