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adjustable setpoints
Model LC
Forward or reverse, mode with
single or differential level operation
Features
Specifications
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Adjustable Sensitivity up to 100,000 ohms
Solid State Amplifier with SCR and Control Relay
Circuit Limits Short Circuit Probe Current 10MA/24VAC
Recommended for Applications Having Longer Than Average
Probe Runs. (Resultant Line Capacitance can be Compensated
for by Adding a Capacitor (CX) of Equivalent Value to Available
Terminals or the Control)
Temperature-Stabilized from +32° F to +140° F
Shielded, Grounded Isolation Transformer
Low Power Consumption
Auxiliary Contactor Available
Outline and Mounting Dimensions
Model Input Supply Model Input Supply
Input Supply : LC-F-1 120VAC, 50/60 Hz LC-R-1 120VAC, 50/60 Hz
LC-F-2 240VAC, 50/60 Hz LC-R-2 240VAC, 50/60 Hz
LC-F-3 24VAC, 50/60 Hz LC-R-3 24VAC, 50/60 Hz
Maximum Allowable Supply Voltage Variation : ± 10%
Maximum Power Consumption : 3 Watts
Detectable Range : Up to 100,000 ohms
Adjustable Range : 1,000 to 100,000 ohms
Operating Point Differential : 3% (Typical)
Signal or Probe Voltage : 24VAC
Maximum Signal or Probe Current : 10MA
Control Relay : Plug-in type with dust cover
Probe Contacts : Internally connected for holding circuit
Load Contacts : DPDT rated 10 amp, Non-inductive/120VAC, 1/4 HP at 240VAC
Auxiliary Contactor : DPST-NO-DB, rated 1 HP at 120VAC, 2 HP at 240VAC
Ambient Operating Temperature : +32° F to +140° F
Standard Termination : Barrier-type terminal blocks for wire up to No. 12AWG.
Auxiliary contactor has combination screw/double .250” quick-connects. Optional
SPDT contacts have .250” quick-connects
Options : Alarm and indicator lamp for enclosure-mounted controls, high impedance
relays available for extended control dropout time.=
Mounting Style : Standoffs
Connection Diagrams
Model LC – Forward Mode
Control energizes when liquid reaches “H”. Con-
trol de-energizes when liquid falls below “L” and
remains in an off state until liquid again reaches
“H”. This control maintains a liquid level between
“H” and “L” and will not chatter due to surface ripple.
Single Level Operation (Not Illustrated)
both the LC-F and LC-R may be used without the
“L” Probe. Operation without the “L” Probe gives a
very small differential between the energize and
de-energize levels. This may result in chattering of
the control if splashing or ripple is present at the
liquid surface.
Model LC – Reverse Mode
Control Energizes when liquid falls below “L. Con-
trol remains energized until liquid rises past “L” and
contacts “H”. Control de-energizes when liquid
reaches “H” and remains in an off state until liquid
again falls below “L. This control maintains a liquid
level between “L” and “H” and will not chatter due
to surface ripple.
Ordering
Information
Typical Curtis Model Number
Model (Also refer to “Specifications” above)
Operational Mode (F – Forward, R – Reverse)
LC-R-1 - -
Contactor (add “C” if desired)
Enclosure – specify only if necessary –
N3-NEMA 3, N3C–NEMA 3/
Contactor, N4 – NEMA 4 JIC
The composite number above reads as an LC amplifier with reverse mode, for 120VAC supply, without enclosure and without contactor.”
For further information on catalog listed controls contact your area Curtis representative or Curtis distributor.
For custom design or modification contact your area Curtis representative or the factory direct.
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