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Selection Chart
Page
Series Number
Supply
Voltage
Load Capacity
Description and Special Notes
Curtis liquid level controls
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ELS
ELC
LCT
LCS
LHS
LC
DLC
Accessories
Liquid level
probe
assemblies
RSA
3
4
5
6
6
7
8
9
9
10
120, 240VAC
120, 240VAC
24, 120, 240VAC
24, 120, 240VAC
24, 120, 240VAC
24, 120, 240VAC
24, 120, 240VAC
24, 120, 240VAC
1/4 HP, 10 amp non-inductive
120VAC, 1/3 HP, 240 VAC
1/4 HP, 10 amp non-inductive
120VAC, 1/3 HP, 240 VAC
1/4 HP, 10 amp non-inductive
120VAC, 1/3 HP, 240 VAC
1/4 HP, 10 amp non-inductive
120VAC, 1/3 HP, 240 VAC
1/6 HP, 10 amp non-inductive
120VAC, 1/3 HP, 240 VAC
1/4 HP, 10 amp non-inductive
120VAC, 1/3 HP, 240 VAC
1/6 HP, 10 amp non-inductive
120VAC, 1/3 HP, 240 VAC
Economical liquid level control sensitivity range
to 100,000 ohms
Low-cost liquid level control with sensitivity up to
50,000 ohms
Liquid level control with built-in time delay
feature for standard applications up to 100,000
ohms
Liquid level control with adjustable sensitivity
ranges for detection up to 100,000 ohms
Liquid level control with adjustable sensitivity
ranges for detection up to 3,00,000 ohms
Liquid level control with forward and reverse
operating modes, adjustable sensitivity to
100,000 ohms
Dual liquid level control with heater/pump
lockout feature, sensitivity range to 100,000
ohms
Rugged, compact contractors and enclosures
meeting NEMA 1, 3, 4, and 12 specifications
A variety of pressure, temperature and fitting
options available
Low-cost amplifier module for liquid level
applications
Curtis industrial controls
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ELS
11
24, 120, 240VAC
1/6 HP, 10 amp non-inductive
For precision photoelectric or temperature
120VAC, 1/3 HP, 230 VAC
applications
Curtis liquid level control principle of operation
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Operating on the principle of conductivity (the ability of a liquid to
conduct electricity), Curtis Liquid Level controls sense and control the
level of almost any fluid or moist solid. These units are available with
fixed or adjustable setpoints to control levels in fluids having an
external circuit resistance up to 3,000,000 ohms. Typical solution
resistivity is shown below.
Typical Liquid Resistivity
Nominal Resistivity
current, typically 500 microamperes, is introduced to a solid-state
resistance-sending amplifier which provides sufficient gate signal to
trigger a silicon-controlled rectifier (SCR). The firing threshold is
accurate to within 2% of operating differential and is adjustable by
means of a potentiometer. The output of the SCR is used to operate
the plug-in control relay. When anticipated loads exceed that of the
standard relay, an auxiliary contactor is utilized.
Control Models ELS, LCS/LHS, LCF and RSA are designed for
forward mode operation. They interpret a decrease of external circuit
resistance from setpoint as an “ON” signal. Model LCR is designed for
Liquid
Range (ohms/CC)
reverse mode operation. It energizes when external circuit resistance
increases above setpoint. Model DLC is intended primarily for pump
acids, bases and salts ................................................ 0-20
dilute acids .............................................................. 20-200
milk, beer ........................................................... 200-2,000
non-distilled water ......................................... 2,000-20,000
distilled water ............................................ 20,000-200,000
In operation, two or more submerged liquid level probes pass a
minute electrical current through the liquid to be controlled. This
4
and heater level/lockout applications. See the appropriate catalog
sections for specific application information.
When selecting a liquid level control, several factors must be taken
into consideration. Questions arise as to what mode of operation is
required, what is the resistivity range of the fluid to be controlled, is a
fixed or variable setpoint called for, are special functions required
such as a pump or heater lockout, etc. Use the connection diagrams
to select the ideal control for your specific application.
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