LLC Series – Liquid Level Controls 系列 - Littelfuse LLC Liquid Level Controls Provide Superior Protection

系列: LLC Series – Liquid Level Controls
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The LLC series provides dual-probe conductive liquid level control in a convenient, octal plug-in package. This unit is used to control liquid pumping operations in pump-up or pump-down applications. Models are available for fixed-fill or drain operation. Isolated, pulsed dc voltage on the probes prevents electrolytic plating. Less than 1 mA of current is set to sense the presence of conductive liquid between the probes and common. On adjustable units, the sensitivity adjustment eliminates false tripping caused by floating debris and foaming agents.

工作原理
Drain (pump-down mode): When the liquid level rises and touches the high-level probe, the output relay and LED energize and remain energized until the liquid level falls below the low-level probe. The output relay and LED de-energize and remain de-energized until the liquid rises and touches the high-level probe.

Fill (pump-up mode): When the liquid level falls below the low-level probe, the output relay and LED energize and remain energized until the liquid level rises and touches the high-level probe. The output relay and LED de-energize and remain de-energized until the liquid level again falls below the low-level probe.

功能与特色

  • Unique probe protection logic
  • LED status indicators
  • Isolated 5 A SPDT contacts

产品文献

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Catalog #Input
Voltage (V)		Output
Form		Termination TypeMounting MethodDimensionsWeight (lbs/g)Control TypeInput AC Line Frequency (Hz)Input Tolerance (%)Output Load Rating (VA)Output TypeResponse Time (ms)Sense Resistance ToleranceSense Resistance (Ohms)Sense VoltageStockSamplesCompare
产品号输入
电压（V）		输出
型式		端接类型安装方法尺寸规格重量（磅/克）Control TypeInput AC Line Frequency (Hz)Input Tolerance (%)Output Load Rating (VA)输出类型响应时间 (ms)Sense Resistance Tolerance感应电阻（Ohms）Sense Voltage库存样品比较
LLC52AA 24 Vac绝缘式SPDT八脚8引脚插入式Plug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0公斤Resistance sensing for high and low level detection of conductive liquids50 / 60-0.355 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminals查看 Order
LLC52BA 24 Vac绝缘式SPDT八脚8引脚插入式Plug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0公斤Resistance sensing for high and low level detection of conductive liquids50 / 60-0.355 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminals查看 Order
LLC54AA 120 Vac绝缘式SPDT八脚8引脚插入式Plug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0公斤Resistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminals查看 Order
LLC54AAS 120 Vac绝缘式SPDT八脚8引脚插入式Plug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0公斤Resistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminals查看 Order
LLC54AF10 120 Vac绝缘式SPDT八脚8引脚插入式Plug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0公斤Resistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s±10% or 500 Ω whichever is greater10 fixedPulsed DC at probe terminals查看 Order
LLC54BA 120 Vac绝缘式SPDT八脚8引脚插入式Plug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0公斤Resistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminals查看 Order
LLC54BAS 120 Vac绝缘式SPDT八脚8引脚插入式Plug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0公斤Resistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminals查看 Order
LLC56AA 230 Vac绝缘式SPDT八脚8引脚插入式Plug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0公斤Resistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminals查看 Order
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