© 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

L1

N/L2

Metal Tank or use

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.