Datasheet > LLC44B20A

LLC44B20A

更新时间： 2024-11-25 14:56:27

品牌	Logo	应用领域
力特 - LITTELFUSE		/
页数	文件大小	规格书
2页	470K
描述
LLC44B20A is a single-probe liquid level control with ac input voltage of 120 and a fixed time delay of 20 s.

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LLC44B20A 数据手册

Protection Relays

Pump Controls and Liquid Level Controls

LLC4 SERIES

Octal Plug-In Liquid Level Controls

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. 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.

8-PIN

Operation

Drain (Pump-Down Mode): When the liquid level rises and

touches the probe, the 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 energize and remain

energized until the liquid level falls below the probe level. The

output relay de-energize and remain de-energized until the liquid

rises and touches the probe.

Wiring Diagram

P = Probe

C = Probe Common

V = Voltage

Fill (Pump-Up Mode): When the liquid level falls below the

probe, the 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 energize and remain energized until the

liquid level rises and touches the probe. The output relay then

de-energize and remain de-energized until the liquid level again

falls below the probe level.

Relay contacts are isolated.

Connect common to

conductive tank. Additional

probe is necessary for

non-conductive or

Metal Tank or use

additional Probe

insulated tanks.

Features & Beneﬁts

N/L2

FEATURES

BENEFITS

Isolated 12VAC probes

Prevents scale buildup on probe

Industry standard 8-pin

octal plug connection

Eliminates need for special connectors

Provides accurate level sensing while ignoring foam

or ﬂoating debris

Sensitivity adjustment

Ordering Information

INPUT

TIME

INPUT

MODEL

TIME

MODEL

OPERATION

SENSE RESISTANCE

OPERATION

SENSE RESISTANCE

VOLTAGE

DELAY

10s

VOLTAGE

DELAY

LLC42A10A 24VAC

LLC42A1A 24VAC

Drain

Fill

Adjustable 1 - 250kΩ

Adjustable 1 - 250kΩ

LLC44B1A

LLC44A60A

LLC44B20A

LLC44B2A

LLC44B30A

LLC44B4A

LLC44B5A

120VAC

Fill

Adjustable 1 - 250kΩ

Fixed 100kΩ

Drain

Fill

60s

20s

LLC42B15A 24VAC

LLC44A10A 120VAC

LLC44A15A 120VAC

15s

10s

15s

Drain

Fill

30s

LLC44A1A

LLC44A2A

LLC44A4A

LLC44A5A

120VAC

Fill

LLC44B5F100 120VAC

Fill

If you don’t ﬁnd the part you need, call us for a custom product 800-843-8848

www.littelfuse.com/llc4

Rev: 1-A-020817

中文翻译

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与LLC44B20A相关器件

型号	品牌	获取价格	描述	数据表
LLC44B2A	LITTELFUSE	获取价格	LLC44B2A is a single-probe liquid level control with ac input voltage of 120 and a fixed t
LLC44B30A	LITTELFUSE	获取价格	LLC44B30A is a single-probe liquid level control with ac input voltage of 120 and a fixed
LLC44B4A	LITTELFUSE	获取价格	LLC44B4A is a single-probe liquid level control with ac input voltage of 120 and a fixed t
LLC44B5A	LITTELFUSE	获取价格	LLC44B5A is a single-probe liquid level control with ac input voltage of 120 and a fixed t
LLC44B5F100	LITTELFUSE	获取价格	LLC44B5F100 is a single-probe liquid level control with ac input voltage of 120 and a fixe
LLC52AA	LITTELFUSE	获取价格	LLC52AA provides dual-probe conductive liquid level control with ac input voltage of 24 an
LLC52BA	LITTELFUSE	获取价格	LLC52BA provides dual-probe conductive liquid level control with ac input voltage of 24 an
LLC54AA	LITTELFUSE	获取价格	LLC54AA provides dual-probe conductive liquid level control with ac input voltage of 120 a
LLC54AAS	LITTELFUSE	获取价格	LLC54AAS provides dual-probe conductive liquid level control with ac input voltage of 120
LLC54AF10	LITTELFUSE	获取价格	LLC54AF10 provides dual-probe conductive liquid level control with ac input voltage of 120

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