SITRANS FC410 flowmeter
A5E33120231-001, 12/2013 17
Zero point adjustment
The flowmeter system is optimized through a zero point adjustment.
Performing a 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.
1. Flush out any gases and obtain stable temperature conditions by running flow at operational conditions for minimum 30
minutes.
Figure 6-1 Best practice zero point adjustment with a by-pass line and two shut-off devices
2. Close the outlet shut-off valve while maintaining the system pressure. If bypass flow is necessary, open the bypass
valve. If the pressure can be increased by 1 to 2 bars with stopped flow, this should be applied.
3. Wait 1 to 2 minutes, for the system to settle, and then perform zero adjustment. Waiting longer can change the
temperature.
4. Select "Device->Wizard - Zero Point Adjustment" from the main menu of SIMATIC PDM to perform an automatic zero
point adjustment.
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