Protection Relays
Pump Controls and Liquid Level Controls
LLC1 SERIES
Open Board Liquid Level Controls
Description
The LLC1 Series is a single probe conductive liquid level control
designed for OEM equipment and commercial appliances. This
unit may be ordered with fixed fill or fixed drain operation. A
time delay (1-60s) prevents rapid cycling of the output relay.
On adjustable units, the sensitivity adjustment allows accurate
level sensing while ignoring foaming agents and floating
debris. Isolated AC voltage is provided at the probe to prevent
electrolysis. A trickle current of less than 1mA determines the
presence or absence of liquid between the probe and common.
The LLC1 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 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.
P = Probe
L = Load
V = Voltage
∆S = Sensitivity
Adjustment
Contacts A, B & C
are isolated.
Connect common to
conductive tank or
an additional probe
as required.
Wiring Diagram
C
Metal Tank or use
additional Probe
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.
Features & Benefits
FEATURES
Isolated AC voltage
on probe
Open PCB design
Conformally coated PCB
Sensitivity adjustment
L1 N/L2
BENEFITS
Prevents scale buildup on the probe
Cost effective design for OEM equipment and
commercial appliances
Protects against moisture and corrosion
Provides accurate level sensing while ignoring foam
or floating debris
Ordering Information
MODEL
INPUT
VOLTAGE
OPERATION
TIME
DELAY
SENSE
RESISTANCE
MOUNTING
LLC14A1AX
LLC14A5AX
LLC14B15AX
LLC14B1AX
LLC14B60AX
LLC16A25AX
LLC16A3AX
120VAC
120VAC
120VAC
120VAC
120VAC
230VAC
230VAC
Drain
Drain
Fill
Fill
Fill
Drain
Drain
1s
5s
15s
1s
60s
25s
3s
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
0.5 in nylon standoffs (3)
0.5 in nylon standoffs (3)
0.5 in nylon standoffs (3)
0.5 in nylon standoffs (3)
0.5 in nylon standoffs (3)
0.5 in nylon standoffs (3)
0.5 in nylon standoffs (3)
If you don’t find the part you need, call us for a custom product 800-843-8848
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/llc1
www.littelfuse.com/
Rev: 1-A-062716
Protection Relays
Pump Controls and Liquid Level Controls
LLC1 SERIES
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.
Specifications
Control
Type
Sense Voltage
Sense Resistance
Sense Resistance Tolerance
Time Delay
Range
Input
Voltage
Tolerance
24VAC
120 & 230VAC
AC Line Frequency
Output
Type
Form
Rating
Life
Protection
Surge
Isolation Voltage
Mechanical
Mounting
ON/OFF (single level) resistance sensor with
built-in time delay to prevent rapid cycling
Low voltage AC between probe & common.
Isolated from input & output.
Fixed or adjustable to 250KΩ
Adjustable - guaranteed range
Factory fixed ±10%
Fixed 1 - 60s in 1s increments
24, 120, or 230VAC
-15% - 20%
-20% - 10%
50/60 Hz
Electromechanical relay
Non-isolated, SPST & Isolated, SPDT contacts
10A resistive @ 120/240VAC & 28VDC;
1/3 hp @ 120/240VAC
Mechanical - 1 x 10
7
; Electrical - 1 x 10
5
IEEE C62.41-1991 Level A
≥ 1500V RMS between input, output & probe
Surface mount to probe common with two
#6 (M3.5 x 0.6) screws or 0.50 in. (12.7 mm)
nylon standoffs with three #6 (M3.5 x 0.6)
screws (use Terminal 5 for probe common)
0.25 in. (6.35 mm) male quick connect terminals
H
88.9 mm (3.5”);
W
69.9 mm (2.75”);
D
50.8 mm (2.0”)
Termination
Dimensions (Open Board)
Environmental
Operating/Storage
Temperature
Coating
Weight
-20° to 55°C/-40° to 80°C
Printed circuit board is conformal coated to
resist moisture and corrosion
≅
8.7 oz (247 g)
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/llc1
www.littelfuse.com/
Rev: 1-A-062716
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