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Specifications Model Input Supply
Input Supply: LCS-10/LHS-1 120V AC, 50/60 Hz
LCS-20/LHS-2 240V AC, 50/60 Hz
LCS-30 24V AC, 50/60 Hz.
Maximum Allowable Supply V oltage V ariation: ± 10%
Maximum Power Consumption: 3 W atts
Detectable Range: Up to 100,000 ohms (LCS); Up to 3,000,000 ohms (LHS)
Adjustable Range:
1,000 to 100,000 ohms (LCS); 1,000 to 3,000,000 ohms (LHS)
Operating Point Differential: 3% (T ypical)
Signal or Probe V oltage: 24V AC
Maximum Signal or Probe Current: 10MA
Outline and Mounting Connection Diagrams
Models LCS/LHS is a forward mode control. The control relay is energized when liquid rises to contact the “H” probe. The control
relay is pulled in and remains energized until liquid drops below the “L” probe. Sensitivity is adjustable.
Typical Curtis Model Number
Model (Also refer to “Specifications” above)
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 LCS amplifier for 240V AC 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.
Ordering
Information
Short Circuit Probe Current: 10MA
Control Relay: Plug-in type with dust cover
Probe Contacts: Internally Connected for Holding Circuit
Load Contacts:
LCS – SPDT, 1/4 HP, 10 amp Non-inductive, 120V AC 1/3 HP at 240 V AC
LHS – SPDT, 1/6 HP, 10 amp Non-inductive, 120V AC 1/3 HP at 240V AC
Auxiliary Contactor: DPST -NO-DB, rated 1 HP at 120V AC, 2 HP at 240VAC
Ambient Operating T emperature : +32° F to +140° F
Standard T ermination: Barrier-type terminal blocks accepting wire up to No.
12AWG. Auxiliary contactor has combination screw/double .250” quick-connects
Mounting Style: Flange
LCS-20- -
Models LCS/LHS
Two sensitivity ranges for
detection up to 3,000,000 ohms
Features
■Low cost Model LCS for Standard Applications up to 100,000 ohms
■High-Sensitivity Model LHS for Special Applications from 100,000 to
3,000,000 ohms
■Solid-State Amplifier with Potentiometer for Signal Sensitivity
Adjustment
■Positive ON/OFF Operation Eliminates Relay Chatter
■Circuit Limits Short Circuit Probe Current to 10MA/24VAC
■Holding Circuit for Differential Levels, or Manual Reset
■Pre-Wired Auxiliary Contactor Available for Handling Heavy Loads
and Motor Ratings Exceeding Capacity of Plug-In Relay
Curtis® liquid level controls with
