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310.6002.0
4
OPERATION
4.1
General
The Series 1041 & 1041A Automatic Switchover Systems are totally automatic systems with manual override. In the
automatic mode, the system dispenses liquid or gas from the on-line source. When the on-line source is depleted,
the system will automatically switchover and dispense from the stand-by source. Manual mode switching is done by
manually opening and closing the motorized ball valves. Whether in automatic or manual mode, the system design
prevents both motorized ball valves from being open at the same time.
4.2
Indicators
In this section, indicator lights are symbolized as follows:
O =OFF,
•
= ON,
*
= Flashing, — = Disregard
4.2.1 Automatic Mode
a. Initially, both motorized ball valves should be closed and each side in stand-by.
b. Open the manual valves on each liquid or gas source.
c. Initiate automatic switchover by setting the mode switch to AUTO and depress and hold the
RESET push-button until all the indicators go on. Valve A will open as indicated by the side A
illuminated OPEN indicator while Valve B remains closed and Side B remains in stand-by.
d. When the Side A on-line source is depleted, the EMPTY light for Side A illuminates and feed transfers
automatically to Side B.
e. Valve A closes as indicated by a flashing CLOSED light while Valve B remains closed and Side B remains
in stand-by.
f. Only when Valve A is completely closed does Valve B open with feed now from Side B.
Side
Empty
Open
Closed
Stand-by
A
O
O
B
O
O
Both valves closed and both sides in stand-by
•
•
•
•
Side
Empty
Open
Closed
Stand-by
A
O
O
O
B
O
O
Valve A open and Side A feeding. Side B in stand-by.
•
•
•
Side
Empty
Open
Closed
Stand-by
A
O
*
O
B
O
O
Valve A empty and Valve A closing. Side B remains in stand-by.
•
•
•
Side
Empty
Open
Closed
Stand-by
A
O
O
B
O
O
O
Side A empty and Valve A closed. Valve B opens and Side B feeding.
•
•
•
