Siemens SITRANS FC410 Operating Instructions Manual page 145

The standard deviation must be within the determined Standard Deviation Limit (Modbus
address 2138).
Note
Exceeded standard deviation limit
If the standard deviation is greater than the configured limit, proceed as follows:
• Check that the tube is completely filled and that the flow rate is absolute zero.
• Check that the installation is vibration-free.
• Check the validity of the configured standard deviation limit in parameter 2.6.4 Standard
Deviation Limit.
• Repeat the zero point adjustment.
Successful automatic zero point adjustment
If the new zero point offset value is valid, it is automatically stored as the new zero point for
the sensor. It remains stored in the case of a power failure.
Manual zero point adjustment
In case an automatic zero point adjustment cannot be performed, it is possible to do a
manual zero point adjustment by entering the zero point offset value.
1. Select Modbus address 2132 Zero Point Adjustment and set the value to 1 = Manual
Zero Point Adjustment.
2. Select Modbus address 2133 Manual Zero Point Offset and enter the desired offset
value.
See also
Zero point adjustment (Page 141)
FC410 with Modbus
Operating Instructions, 02/2016, A5E33120874-AC
Zero point adjustment
143