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36
Liquid Level Protection
Sensor and Control Relays
460-15-100-LLS
Liquid Level Sensor
Description
The 460-15-100-LLS is a liquid level sensor to detect the
presence of conductive liquids. A probe is mounted at the
desired tank level and connected to the Littelfuse Pump
Protection Relay. When the probe is submersed, the relay’s
output contacts will change state as soon as the debounce time
expires. The adjustable debounce timer is intended to prevent
nuisance actuating due to waves or splashing in the tank.
Relay logic can be inverted so the relay’s output contacts change
state when the probe is no longer submersed. This makes the
unit versatile for use in pump-up and pump-down applications.
Specifications
Input Characteristics
Control Voltage
110/120VAC nominal
Frequency
50*/60Hz
Sensitivity
100kΩ
Functional Characteristics
Probe Sense Voltage
5vdc pulsed
Debounce Time Delay
2-60 seconds
Output Characteristics
Output contact Rating
– (Two Form A - SPST)
Pilot Duty
360VA @ 240VAC
General Purpose
8A @ 240VAC
General Characteristics
Ambient Temperature Range
Operating
-20° to 70°C (-4° to 158°F)
Storage
-40° to 80°C (-40° to 176°F)
Maximum Input Power
2 W
Class of Protection
IP20, NEMA 1 (finger safe)
Relative Humidity
10-95%, non-condensing per IEC 68-2-3
Terminal Torque
4.5 in.-lbs.
Wire
12-20 AWG
Standards Passed
Electrostatic Discharge (ESD)
IEC 61000-4-2, Level 3, 6kV contact, 8kV air
Radio Frequency Immunity,
Radiated
150MHz, 10 V/m
Fast Transient Burst
IEC 61000-4-4, Level 3, 3.5kV input power
and controls
Surge
IEC
IEC 61000-4-5, Level 3, 4kV line-to-line;
Level 4, 4kV line-to-ground
ANSI/IEEE
C62.41 Surge and Ring Wave Compliance to
a level of 6kV line-to-line
Hi-Potential Test
Meets UL508 (2 x rated V + 1000 V for 1 min.)
Safety Marks
cULus
UL508 (File #E68520)
CE
IEC 60947
Enclosure
Polycarbonate
Dimensions
H
88.9 mm (3.5”);
W
52.93 mm (2.08”);
D
59.69mm (2.35”)
Weight
1 lb. (16 oz., 453.59 g)
Mounting Method
35mm DIN rail or Surface Mount
(#6 or #8 screws)
*Note: 50Hz will increase all delay timers by 20%)
Features & Benefits
FEATURES
BENEFITS
Unique Probe
Protection
Probes are protected from scale build up through
pulsed DC signal between the probes
Invertible relay logic
Allows flexibility to be used in pump-up and
pump-down applications
Adjustable
debounce timer
Prevents nuisance actuating caused by waves or
splashing in the tank
LED status indicators
Quick visual indicator or of relay status of trip