Parameter Protection In Custody Transfer Mode - Siemens SITRANS FC430 Operating Instructions Manual

Custody Transfer

9.4 Parameter protection in custody transfer mode

For remote variants with M12 plugs it is necessary to use the plug seals supplied with the
flow sensor. The plug seal encases the M12 plug, preventing unauthorized removal of the
sensor cable at either end.
The M12 plug is sealed in the following manner:
1. Make sure the M12 plug is correctly installed and tight in its socket.
2. Clip the two halves of the plug seal together around the plug and sensor cable as shown
in the above figures.
3. Ensure that the plug seal is free to rotate without catching on the plug or cable. The seal
assembly prevents unauthorized access by disabling any ability to unscrew the plug from
its socket.
4. Close the seal with a seal wire and crimp the seal plumb.
The device is now prepared for custody transfer operation and may be used in applications
subject to legal metrology controls.
9.4 Parameter protection in custody transfer mode
The CT mode provides an additional protection of set of parameters. These parameters are
writable in non-CT mode but only readable in CT mode. In the following table the menus are
entered in bold text and the parameters in
For a complete list of parameters and description of levels, see appendix HMI menu
structure (Page 231).
Table 9- 1 Parameters protected in CT mode
Level 2 Level 3
No. Name No.
2.1.1
2.1 Basic settings
2.1.2
2.2 Process Values 2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
166
Name
Flow Direction
Process Noise Damping
Massflow
Volumeflow
Corrected Volumeflow
Flow Adjustment
Density
italic
.
Level 4
No. Name
2.2.1.2 Low Flow Cut-Off
2.2.2.2 Low Flow Cut-Off
2.2.3.8 Reference Density
2.2.4.1 Adjustment Factor
2.2.5.2 Empty Tube Detection
2.2.5.3 Empty Tube Limit
2.2.5.10 Density Adjustment
Operating Instructions, 05/2015, A5E03361511-AF
Level 5
No. Name
2.2.3.8.2 Corrected Volu-
meflow Mode
2.2.3.8.3 Fixed Reference
Density
2.2.3.8.4 Linear Expansion
Coeff.
2.2.3.8.5 Square Expan-
sion Coeff.
2.2.3.8.6 Reference Tem-
perature
2.2.5.10.1 Adjustment Factor
2.2.5.10.2 Adjustment Offset
FC430 with HART