Aquametrix LL Series Liquid Level Controllers - Manual (Page 3)

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LL4
Single Level Service
High Alarm or Low Level Cutoff
Attach electrical ground to terminal 1, attach power to terminals
2 and 3. Attach tank ground or always submersed electrode to
terminal 12, and single level electrode to terminal 11. Terminal 10
is not in use. Attach one pump lead to terminal 6, and the other
to normally open terminal 5. Terminal 5 will close when liquid
reaches level electrode.
Differential Level Service
Pump Down
Attach electrical ground to terminal 1, attach power to terminals
2 and 3. Attach tank ground or always submersed electrode to
terminal 12, short electrode to terminal 11, and long electrode to
terminal 10. Attach one pump lead to terminal 6, and the other
to normally open terminal 5. If liquid rises above short electrode,
terminal 5 will close, and re-open after the liquid falls under the
long electrode.
Single Level Service
Low Alarm or High Level Cutoff
Attach electrical ground to terminal 1, attach power to terminals
2 and 3. Attach tank ground or always submersed electrode to
terminal 12, and single level electrode to terminal 11. Terminal 10
is not in use. Attach one pump lead to terminal 6, and the other
to normally closed terminal 4. Terminal 4 will open when liquid
reaches level electrode.
Differential Level Service
Pump Up
Attach electrical ground to terminal 1, attach power to terminals
2 and 3. Attach tank ground or always submersed electrode to
terminal 12, short electrode to terminal 11, and long electrode to
terminal 10. Attach one pump lead to terminal 6, and the other to
normally closed terminal 4. If liquid rises above short electrode,
terminal 4 will open, and close again after the liquid falls under
the long electrode.
LL7 and LL7H
Single Level Service
Refer to LL4 for standard wiring instructions. The LL7 includes
the additional feature of an auxilary open contact. Attach one
auxillary lead to common terminal 7, and the other lead to
normally open terminal 8. Terminal 10 is not in use. When liquid
reaches level electrode, terminal 8 will close, and will re-open
when liquid again goes below electrode. This may be used for an
alarm or annunciator.
LL3
Single Level Service
Refer to LL4 for standard wiring instructions. The LL3 includes
two auxilary contacts, normal open and normal closed. Attach
one auxillary lead to common terminal 7. For direct operation,
connect second lead to normally open terminal 8. For inverse
operation, connect to normally closed terminal 9. When liquid
reaches level electrode, auxillary relay will either open or close
depending on which terminal is used.
Differential Level Service
Refer to LL4 for standard wiring instructions. The LL3 includes
two auxilary contacts, normal open and normal closed. Attach
one auxillary lead to common terminal 7. For direct operation,
connect second lead to normally open terminal 8. For inverse
operation, connect to normally closed terminal 9. When liquid
rises above short electrode or falls below long electrode, auxil-
lary relay will either open or close depending on which terminal
is used.
Differential Level Service
Refer to LL4 for standard wiring instructions. The LL7 includes
the additional feature of an auxilary open contact. Attach one
auxillary lead to common terminal 7, and the other lead to
normally open terminal 8. Terminal 9 is not in use. When liquid
reaches short electrode, terminal 8 will close, and will re-open
when liquid again goes below long electrode. This may be used
for an alarm or annunciator.
Connect terminal 12 to tank if metallic and grounded. For ungrounded tank connect an additional electrode, which must always be
immersed in liquid, to terminal 12. Single level requires one level electrode plus a tank ground. Differential level requires two elec-
trodes for the tank level to remain between.
LL7H ONLY; Terminal 10 is used to neutralize capacitance effect of cable. If controller is more then 20 meters from tank use a three
conductor cable and connect a one wire to NW and leave unconnected at tank. Do not use the shield for this purpose.
Model LL3, LL4, LL7 and LL7H Operation and Wiring
LEVEL TOLERANCE
GROUND ELECTRODE (OR TANK)
LOWER LEVEL ELECTRODE
(PUMP ON, AUX. ON)
UPPER ELECTRODE
(PUMP OFF, AUX. OFF)
Single Level Configuration Differential Level Configuration
GROUND ELECTRODE (OR TANK)
LEVEL ELECTRODE
BELOW: PUMP ON, AUX OFF
ABOVE: PUMP OFF, AUX ON