KROHNE Summit 8800 Vol 2 - Manual (Page 150)

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SUMMIT 8800 VALVES 11
11. Valves
Liquid Gas Steam
Valves are used in all metering applications from individual streams, to station and proving
skids.
Up to 18 valves can be set by the flow computer for control purposes. Application can vary from
simply opening and closing valves to controlling the valve position (e.g. for pressure or flow
comtrol) or changing flow direction by a 4 way valve.
These valves are independent from the valves used for run switching and sampling, so the total
number of valves can be far more than 18.
This page allows the user to configure the operation of each valve based on the type of valve
connected to the SUMMIT 8800.
The following valve types are available for selection from the drop down menu:
Figure 158 Valve options
Inactive Not in use
Analogue 4-20mA signal operative set to a preset value and position
Digitial Timed digital output with no feedback
PID 4-20mA signal used as a PID control output
Feedback Digital switch output with open, close and transition time control coupled with digital
status input to feedback valve position.
Four way 4 position valve control used in a liquid prover system.
NOTE: Valve output signals and in some cases input signals are configured in the hardware sec-
tion under the relevant I/O board.
Valve alarm may occur.