Dosing - Siemens SITRANS FC430 Operating Instructions Manual
Coriolis flowmeters with hart
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Also See for SITRANS FC430:
- Operating instructions manual (534 pages) ,
- Compact operating instructions (93 pages) ,
- Upgrade instructions (20 pages)
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8.8
Dosing
The dosing function controls the sequence of flow through one or two valves into a container.
The user can set the Amount and the sequence of controlling the valve(s). The dosing
function then controls the valves to open and close in sequence to achieve the Amount.
The process values for dosing control are updated with 100 Hz to ensure maximum
response time of 10 ms to rapidly changing flows.
The flow sequence can be paused, resumed and ended by the user at any point in the flow
sequence.
Transmitter outputs therefore change state according to the dosing sequence or operator
commands. For optimal dosing control the minimum number of components between the
flowmeter and the dosing valves must be employed. The dosing function must be configured
for the type of valve used for dosing:
● One Stage Dosing:
Dosing controlled by a single discrete (Open/Closed) valve. The valve opens completely
when the dosing begins, and closes completely when the dosing Amount is reached.
● Two Stage Dosing:
Dosing controlled by two discrete valves (a primary valve and a secondary valve). One
valve opens at the beginning of the dosing; the other opens at a user-defined amount.
One valve stays open until the end of the dosing; the other closes at a user-defined
amount. See examples below (Page 151) of some different opening and closing options.
● Analog Dosing:
Dosing controlled by an analog valve configured in three stages as fully open, partially
closed, and fully closed. See example below (Page 151) of the three-positional analog
dosing.
Dosing setup procedure
The dosing functionality is configured via HMI. Menu 2.4 "Inputs/Outputs" determines how
the transmitter will use the inputs and outputs for dosing control. Menu 2.5 "Dosing"
independently determines the sequencing of the outputs to achieve the user's desired result.
The dosing function provides:
● three dosing valve control mechanisms (One Stage Dosing, Two Stage Dosing or Analog
Dosing)
● dosing of massflow, volumeflow, corrected volumeflow or fraction flow (mass or volume)
● five independently configurable recipes
● flexible discrete or analog valve control
● fault handling – time and amount monitoring
FC430 with HART
Operating Instructions, 05/2015, A5E03361511-AF
Functions
8.8 Dosing
149
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