Littelfuse LLC42A1A, LLC4 Series, Octal Plug-In Liquid Level Control Constant Level SPDT, 24VAC, Drain Operation, 1s Time Delay
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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. Isolated 12VAC is provided at the probe to prevent electrolysis. A trickle current of less than 1mA determines the presence or absence of conductive 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.
Specifications
| Control | |
| Type | ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling |
| Sense Voltage | 12VAC |
| Sense Resistance | Fixed or adjustable to 250KΩ |
| Sense Resistance Tolerance |
Adjustable: 1K ±500Ω at low end; 250K ±25% at high end Factory fixed: ±10% or 500Ω, whichever is greater |
| Input | |
| Voltage | 24VAC |
| Tolerance |
-15%, +20% |
| AC Line Frequency | 50/60 Hz |
| Output | |
| Type | Electromechanical relay |
| Form | solated, SPDT |
| Rating |
4A resistive @ 240VAC; 1/10 hp @ 240VAC |
| Protection | |
| Surge | IEEE C62.41-1991 Level A |
| Isolation Voltage | ≥ 1500V RMS between input, output & probe |
| Mechanical | |
| Mounting | Plug-in socket |
| Termination | Octal 8-pin plug-in |
| Dimensions (Open Board) |
H 73.9 mm (2.91”) W 60.7 mm (2.39”) D 45.2 mm (1.78”) |
| Environmental | |
| Operating/Storage Temperature | -20° to 60°C/-40° to 80°C |
| Weight | ≅ 6 oz (170 g) |