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Curtis liquid level controls
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Model ELC
Economical unit with sensitivity
up to 50,000 ohms
Features
s Compact, Solid-State Design
s Single Level, Forward Mode Operation
s Holding Circuit for Differential Levels, or Manual Reset
s Low AC Signal Voltage
s Transient-Protected Circuit, Positive ON/OFF Eliminates Relay
Chatter
s Circuit Design Limits Short Circuit Probe Current to
10MA/24VAC
Specifications
Model
Input Supply
Input Supply :
ELC-1-S,D
ELC-1-S,D
120VAC, 50/60 Hz
240VAC, 50/60 Hz
Control Relay : Plug-in Type with Dust-Tight Cover
Probe Contacts : SPDT internally connected
Maximum Allowable Supply Voltage Variation : ± 10%
Maximum Power Consumption : 3 Watts
Detectable Range : Up to 50,000 ohms
Operating Point Differential : 3% (Typical)
Maximum Signal or Probe Voltage : 24VAC
Maximum Signal or Probe Current : 10MA
Outline and Mounting Dimensions
Load Contacts : SPDT (ELC-1,2-S) or DPDT (ELC-1,2-D)
Rated 10 amp Non-inductive, 120VAC, 1/4 HP
1/3 HP at 240VAC
Ambient Operating Temperature : +32° F to +140° F
Standard Termination : .250” Quick-Connect
Mounting Style : 4 Standoffs
Connection Diagrams
This is a fixed-sensitivity, 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.
Ordering
Information
Typical Curtis Model Number
Model (Also refer to “Specifications” above)
ELC-1 -S-
Detectable Range (A-100 k ohms, B-50 k ohms, C-25 k ohms)
Enclosure – specify only if necessary –
N3-NEMA 3, N4–NEMA 4 JIC
The composite number above reads as “an ELC amplifier for 120VAC supply SPDT Output and without Enclosure.”
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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