CaptiveAire LLC4 User Manual
Liquid Level ControlLiquid Level Control
Liquid Level Control
Liquid Level ControlLiquid Level Control
LLC4 Series
Single Probe
DescriptionDescription
Description
DescriptionDescription
The LLC4 combines resistance sensing circuitry with solid state timing to provide single probe level maintenance.
On adjustable units, the sensitivity adjustment allows accurate level sensing while ignoring foaming agents and
floating debris. Transformer isolated 12 V AC is provided at the probe to prevent electrolysis. A trickle current
of less than 1 mA determines the presence or absence of liquid between the probe and common. The LLC4
Series can be used with many types of low voltage (resistance changing) transducers to perform other control
functions like temperature limit control, photo limit control, condensation sensing, and ice sensing.
Single Probe Level
Control for Conductive
Liquids
Adjustable or Fixed
Sensing up to 250K
Ω
Fill or Drain Operation
Available
24, 120, or 230 V AC
Models are Available
Isolated AC Voltage on
the Probes
4 A Resistive SPDT
Isolated Contacts
Approvals:
AccessoriesAccessories
Accessories
AccessoriesAccessories
Panel mount kit
BZ1 BZ1
P/N:
BZ1
BZ1 BZ1
Octal
8 pin socket
NDS-8 NDS-8
P/N:
NDS-8
NDS-8 NDS-8
OperationOperation
Operation
OperationOperation
Drain (Pump Down Mode):Drain (Pump Down Mode):
Drain (Pump Down Mode): When the liquid level
Drain (Pump Down Mode):Drain (Pump Down Mode):
rises and touches the probe, a fixed time delay begins.
This time delay prevents rapid cycling of the output
relay and its load. At the end of the time delay, the
output relay energizes and remains energized until
the liquid level falls below the probe. The output relay
then de-energizes and remains de-energized until the
liquid again touches the probe.
Fill (Pump Up Mode): Fill (Pump Up Mode):
Fill (Pump Up Mode):
Fill (Pump Up Mode): Fill (Pump Up Mode):
When the liquid level falls
below the probe, a fixed time delay begins. This time
delay prevents rapid cycling of the output relay and
its load. At the end of the time delay, the output relay
energizes and remains energized until the liquid level
rises and touches the probe. The output relay then
de-energizes and remains de-energized until the liquid
level again falls below the probe.
ConnectionConnection
Connection
ConnectionConnection
Relay contacts are isolated. Dashed lines are
internal connections.
Connect common to conductive tank. Additional
probe is necessary for non-conductive or
insulated tanks.
P = Probe C = Probe Common V = Voltage
Hold down clips
PSC8PSC8
P/N:
PSC8
PSC8PSC8
Electrode with
common connection
WCC-1138-3 WCC-1138-3
P/N:
WCC-1138-3
WCC-1138-3 WCC-1138-3
Electrode
WCC-1138 WCC-1138
P/N:
WCC-1138
WCC-1138 WCC-1138
Level probe P/N:
LLP-24LLP-24
LLP-24
LLP-24LLP-24
See accessory pages for
specifications.
OrOr
dering Tdering T
Or
dering T
OrOr
dering Tdering T
LLC4 LLC4
LLC4
LLC4 LLC4
SeriesSeries
Series
SeriesSeries
Example P/N:Example P/N:
Example P/N:
Example P/N:Example P/N:
ableable
able
ableable
XX
X
XX
InputInput
Input
InputInput
22
–
2 - 24 V AC
22
44
–
4 - 120 V AC
44
66
–
6 - 230 V AC
66
LLC44A1A LLC44A1A
LLC44A1A Fixed –
LLC44A1A LLC44A1A
XX
X
XX
OperationOperation
Operation
OperationOperation
A A
–
A - Drain
A A
BB
–
B - Fill
BB
LLC46B5F50 LLC46B5F50
LLC46B5F50
LLC46B5F50 LLC46B5F50
XX
X
XX
Time DelayTime Delay
Time Delay
Time DelayTime Delay
(Seconds)(Seconds)
(Seconds)
(Seconds)(Seconds)
–Specify fixed delay
11
6060
(
1 ...
60) secs. in
11
6060
1 s increments
Low Voltage Products & Systems9.6
XX
X
XX
SenseSense
Sense
SenseSense
ResistanceResistance
Resistance
ResistanceResistance
A A
–
A - Adjustable
A A
F F
–
F - Fixed
F F
Specify fixed
resistance (
in 1K Ω increments
11
1 ...
11
250250
250)
250250
LLC42B01 05.03.04
Liquid Level ControlLiquid Level Control
Liquid Level Control
Liquid Level ControlLiquid Level Control
LLC4 Series
Single Probe
Technical Data Technical Data
Technical Data
Technical Data Technical Data
ControlControl
Control
ControlControl
Type ON/OFF (Single Level) Resistance sensor with built-in time delay to prevent rapid cycling
Sense Voltage 12 V AC at probe terminals
Sense Resistance Factory fixed or adjustable to 250K Ω
Sense Resistance Tolerance Adjustable - guaranteed range
InputInput
Input
InputInput
Voltage 24, 120, or 230 V AC
Tolerance 24 V AC -15% ... +20%
120 & 230 V AC -20% ... +10%
Frequency 50 ... 60 Hz
OutputOutput
Output
OutputOutput
Type Electromechanical relay
Form Isolated single pole double throw (SPDT) contacts
Rating 4 A resistive at 240 V AC; 1/10 hp at 240 V AC
ProtectionProtection
Protection
ProtectionProtection
Surge IEEE C62.41-1991 Level A
Isolation Voltage ≥ 1500 V RMS between input, output, & probe
MechanicalMechanical
Mechanical
MechanicalMechanical
Mounting Plug-in socket
Termination 8 Pin plug-in
Package 2.91 x 2.39 x 1.78 in. (73.9 x 60.7 x 45.2 mm)
EnvironmentalEnvironmental
Environmental
EnvironmentalEnvironmental
Operating Temperature -20°C ... +60°C
Storage Temperature -40°C ... +80°C
Weight ≅ 6 oz (170 g)
Factory fixed +/-10%
LLC42B01 05.03.04
Mechanical View Mechanical View
Mechanical View
Mechanical View Mechanical View
Inches (Millimeters)
Low Voltage Products & Systems 9.7
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