Mody Pumps MS 252 - Manual (Page 8)

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LLC41A01 06.04.02
Liquid Level Control
LLC4 Series
Single Probe
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
Description
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.
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.
Ordering Table
Control
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
Factory fixed +/-10%
Input
Voltage 24, 120, or 230 V AC
Tolerance 24 V AC -15% ... +20%
120 & 230 V AC -20% ... +10%
Frequency 50 ... 60 Hz
Output
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
Protection
Surge IEEE C62.41-1991 Level A
Isolation Voltage ≥ 1500 V RMS between input, output, & probe
Mechanical
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)
Environmental
Operating Temperature -20°C ... +60°C
Storage Temperature -40°C ... +80°C
Weight
≅
6 oz (170 g)
Series Input Time Delay
(Seconds) Sense
Resistance
Example P/N: LLC44A1A Fixed – LLC46B5F50
Operation
Specify fixed
resistance
(
1 ... 250 )
in 1K Ω
increments
–Specify fixed delay
(
1 ... 60 ) secs. in
1 s increments
P = Probe C = Probe Common V = Voltage
Relay contacts are isolated. Dashed lines are
internal connections.
Connect common to conductive tank. Additional
probe is necessary for non-conductive or
insulated tanks.
Approvals:
Level probe
P/N: LLP-24
Accessories
Panel mount kit
P/N: BZ1
Octal
8-pin socket
P/N: NDS- 8
Electrode
P/N: WCC-1138
Electrode with
common connection
P/N: WCC-1138-3
Hold down clips
P/N: PSC8
Inches (Millimeters)
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.
– 2 - 24 V AC
– 4 - 120 V AC
– 6 - 230 V AC
X LLC4
– A - Drain
– B - Fill
X
– A - Adjustable
X X
– F - Fixed
Technical Data
See accessory page at the end of this section.
Sales Information 1-800-431-2308 Technical Assistance 1-800-377-SSAC (7722) www.ssac.com