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Valve operation
AC-250NXS has an integrated valve, which can be operated locally from the optical port
from the FieldSense tool or remotely over cellular CAT-M1 network from Connexo or
NetSense. The valve can be also operated autonomously by the meter when a high
pressure or high temperature is detected based on the meter configuration.
The current position of the valve (Open/Closed) is shown on the Meter LCD screen at
the bottom of the screen in all the main screens by the indicator ON/OFF. The valve can
be closed when in it is in ON state, and opened when it is in OFF state.
Valve Opening operation
Caution: The valve operation of opening the vale shall not be done whilst the meter is pressurized above
2PSIG differential pressure, if the pressure is higher the valve may be damaged!
When the "open valve" command is issued in closed state, the meter waits for
confirmation from the user. Once the user confirms by pressing the "select" button, the
valve opens and then the valve leakage test starts. During the test, a timer screen is
displayed which shows the maximum and minimum times for completion of the leakage
test. After the test is completed, a "gas flow check successful" message is displayed. In
case any gas flow is detected during the gas flow check, a "gas flow check failed" error
message will be displayed. The user needs to acknowledge the gas flow
successful/failure screen. After a few seconds, a "valve open successfully" message is
displayed on the screen in case of gas flow check success; or a "valve closed successful"
message is displayed on the screen in case of gas flow failure. Once the valve is
opened/closed successfully, click the "select" button to enter the main screen, where a
user can see the current valve position indicated as ON or OFF.
The Valve opening operation can be done in the following ways:
Valve open success with flow test enabled.
1.
Valve open failure with flow test enabled.
2.
Valve open success without flow test.
3.
Valve open failure due to system error.
4.
Valve open failure due to environmental error.
5.
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