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Curtis liquid level controls
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Model ELS
Economical unit with sensitivity
up to 100,000 ohms
Features
s Solid State Amplifier with SCR and Control Relay
s Low AC Signal Voltage
s Compact Printed Circuit Design
s 1/4” Quick-Connect Terminals
s Insensitive to Transients
s Built-in Holding Circuit for Differential Levels or Manual Reset
s Plug-in Dust-Tight Relay
s Recognized Under the Components Program of Underwriters
Laboratories, Inc. Listed with Canadian Standards Association.
Specifications
Input Supply :
Model
ELS-1-A,B,C
ELS-1-A,B,C
Input Supply
120VAC, 50/60 Hz
240VAC, 50/60 Hz
Maximum Signal or Probe Voltage : 24VAC
Maximum Signal or Probe Current : 10MA
Maximum Allowable Supply Voltage Variation : ± 10%
Control Relay : Single Pole Double Throw, Plug-in Type with Dust-Tight Cover
Maximum Power Consumption : 3 Watts
Detectable Range : ELS-1,2-A
ELS-1,2-B
ELS-1,2-C
100,000 ohms
50,000 ohms
25,000 ohms
Load Contacts : SPST Rated – 1/4 HP, 10 Amps, 120VAC
1/3 HP, 10 Amps, 240VAC
Ambient Operating Temperature : 32° F to 140° F
Standard Termination : .250” Quick-Connects
Outline and Mounting Dimensions
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)
ELS-1 -A-
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 ELS amplifier for 120VAC supply, without enclosure, and with 100 K ohms sensitivity.”
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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