© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/
Rev: 1-A-062716
Protection Relays
Pump Controls and Liquid Level Controls
www.littelfuse.com/llc2
LLC2 SERIES
Description
The LLC2 Series is a dual-probe conductive liquid level control
designed for OEM equipment and commercial appliance
applications. Models are available for fill or drain operation.
Transformer isolated 12VAC is provided at the probes to prevent
electrolysis. A trickle current of less than 1mA determines the
presence or absence of liquid between the probes and common.
On adjustable units, the sensitivity adjustment allows accurate
level sensing while ignoring foaming agents and floating debris.
The LLC2 Series printed circuit board is conformal coated to
resist moisture and corrosion.
Operation
Drain (Pump-Down Mode): When the liquid level rises and
touches the high probe, the output relay energizes and remains
energized until the liquid level falls below the low probe. The
output relay then de-energizes and remains de-energized until
the liquid again touches the high probe.
Fill (Pump-Up Mode): When the liquid level falls below the low
probe, the output relay energizes and remains energized until
the liquid level rises and touches the high probe. The output
relay then de-energizes and remains de-energized until the liquid
level again falls below the low probe.
Features & Benefits
FEATURES BENEFITS
Isolated 12VAC probes Prevents scale buildup on the probes
Open PCB design
Cost effective design for OEM equipment and
commercial appliances
Conformally coated PCB Protects against moisture and corrosion
Sensitivity adjustment
Provides accurate level sensing while ignoring foam
or floating debris
Accessories
P1015-13 (AWG 10/12), P1015-64 (AWG 14/16),
P1015-14 (AWG 18/22) Female Quick Connect
These 0.25 in. (6.35 mm) female terminals are
constructed with an insulator barrel to provide
strain relief.
P1015-18 Quick Connect to Screw Adapter
Screw adapter terminal designed for use with
all modules with 0.25 in. (6.35 mm) male quick
connect terminals.
PHST-38QTN Electrode
Designed for a maximum steam pressure of
240 PSI; 400° F. UL353 Recognized.
LLP-24 Threaded Probe (24”)
Threaded stainless steel probe measuring 24”
(61 cm) long. For use with PHST-38QTN liquid
level control electrodes.
Open Board Liquid Level Controls
Ordering Information
MODEL
INPUT
VOLTAGE
OPERATION TERMINATION
SENSE
RESISTANCE
LLC24A2AN
120VAC
Drain Terminal block
Adjustable
to 100kΩ
LLC24A2F50N
120VAC
Drain Terminal block Fixed 50kΩ
LLC24B1AC
120VAC
Fill
0.25”
Quick connect
Adjustable
to 100kΩ
LLC24B1F26C
120VAC
Fill
0.25”
Quick connect
Fixed 26kΩ
LLC24B2F50N
120VAC
Fill Terminal block Fixed 50kΩ
LLC26A1F25C
230VAC
Drain
0.25”
Quick connect
Fixed 25kΩ
If you don’t find the part you need, call us for a custom product 800-843-8848
Wiring Diagram
Metal Ta
additional Probe
V = Voltage
L = Low Probe
H = High Probe
C = Probe Common
P = Probe
∆S = Sensitivity
Adjustment
NC = Normally
Closed
NO = Normally
Open
Connect common to conductive tank. Additional
probe is necessary for non-conductive or
insulated tanks.
