Precision Digital PD650 - Manual (Page 78)

Model PD650 Large Display Process Meter Instruction Manual
78
Manual Batch Control Operation
The meter can be used for simple manual batch control as the following
illustrates:
The valve and External Switch KEY
Legend is as shown:
Both valves are open to fill the barrel:
Meter displays barrel contents.
Full-flow valve #1 is closed and
restricted-flow valve #2 “dribbles” in the
remaining 5 gallons.
When total reaches 55.00, relay 2 trips
and closes restricted-flow valve #2.
Display freezes on 55.00 and relays 1
and 2 will not reset until external switch
is pushed.
Both valves are still closed and a new
barrel is positioned. Meter displays
previous barrel’s contents until external
reset button is pushed.
Operator presses reset switch to reset
total. Total goes to zero. Both relays
reset causing both valves to open and
begin filling the new barrel.
Both valves are open to fill the barrel:
Meter displays barrel contents.