SITRANS F C MASSFLO
22
SFIDK.PS.028.R1.02
ENGLISH
5.6 Reset mode
Reset mode
In the reset mode menu the totalizer 1 and 2 and the batch cycle counter can be reset.
0-point adjustment
0-point adjustment of the flow meter is done in the Zero adjust menu. The adjustment can be made
automatically where the meter measures and calculates the correct 0-point. In manual mode the
0-point can be programmed if this is known. Normally the Automode is used.
Zero adjust time determines the period of time for the 0-point adjustment. As default a period of
30 sec. is used which normally is enough for a stable 0-point mesurement. If however the
flowmeter is used where small flow rates are measured very accurately, a longer integration time
can be selected, to obtain a better 0-point measurement.
Setting the 0-point is carried out by activating Zero adjust. A number of individual 0-point
adjustments are then made. The 0-point found is shown as Zero adjust. The value Zero Sigma
shows the standard deviation of the individual measurements made. The standard deviation (Zero
Sigma) must be within a window, which is predefined by Siemens Flow Instruments. This window
is called Sigma Limit. If the standard deviation is outside the window the following message is
shown in the display: “Zero Sigma exceeds Sigma Limit”. In this case check the installation, ensure
that the pipe is full and that there is absolute 0-flow present. Then repeat the 0-point adjustment.
The new 0-point is automatically stored in the SENSORPROM
and hence will remain at power
down situations.
5. Commissioning
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