LF55 Pressure Switch - Phosphor Bronze Bellows

Pressure Switch

The LF55 pressure switch is an automatic control device that responds to pressure signals and operates accordingly. It can serve as a safety protection measure in various devices such as pumps, hydraulic systems, and hydraulic machinery. Provide international standard mounting bracket for any part. SPDT switch ensures reliable contact switching. The pressure bellows of the standard model are phosphor bronze bellows, the pressure port is made of brass.

Product Details

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Product Details

Introduction

• The LF55 pressure switch is an automatic control device that responds to pressure signals and operates accordingly.
• It can serve as a safety protection measure in various devices such as pumps, hydraulic systems, and hydraulic machinery.
• Provide international standard mounting bracket for any part.
• SPDT switch ensures reliable contact switching.
• The pressure bellows of the standard model are phosphor bronze bellows, the pressure port is made of brass.

Working principle

By adjusting the screw of the pressure switch, the spring tension can be adjusted. The deeper the screw is screwed in, the greater the spring force that the measuring element must overcome, and the switch point value correspondingly increases. The geometric structure of the spring is designed according to the required switching range. According to the functional principle of mechanical pressure switches, the switching point is defined by the spring pre-tension, which sets the switching point when the pressure increases. When the external pressure acts on the pressure sensing element as the pressure decreases, the spring or diaphragm deforms accordingly. When the pressure reaches a certain level, the deformation of the spring or diaphragm causes a displacement in the mechanical structure, thereby closing or opening the contacts and changing the conductivity state of the circuit.

Widely used for reverse osmosis systems.

Pressure Switch

Specification

		120V AC	250V AC
Non-induced Current		20A	10A
Induced Current	Full-load	15A	8A
	Momentary	72A

Notice

Use two spanners to avoid damaging the controller； Install to the equipment by four M4 screws on back side of the controller directly； Use multi-purpose mounting plate, it is also easy to install. Please use screws in attachment bag when installing.

Model	Range(bar)		Differential (bar)		Factory Setting (bar)		Max Airtight Test Pressure(bar)
Model	Min.	Max.	Min.	Max.	OFF	ON	Max Airtight Test Pressure(bar)
LF5502	-0.5	2	0.2	0.7	1	0.5	16.5
LF5503	-0.5	3	0.35	1.5	2	1	16.5
LF5506	-0.5	6	0.6	4	3	2	16.5
LF5506M	-0.5	6	Reset differential≤1bar		3	Manual Reset	16.5
LF5510	1	10	1	3	6	5	16.5
LF5516	3	16	1	4	10	8	35
LF5520	5	20	2	5	16	13	35
LF5530	8	30	Fixed 3-5		20	15~17	35
LF5530M	8	30	Reset differential≤4bar		20	Manual Reset	35
LF5530D	5	30	3	10	20	15	35
LF5532	8	32	2	6	20	17	35
LF5542	8	42	4	10	30	25	46.5

Scale plate：two units-“bar”&“psig”；“MPa”&“Kgf/cm2”are also available；

British thread model can add“Ｅ”according to custom requirement，

Also wilding model add“Ｃ”, capillary model add“S”，such as LF5506E；

Ammonia refrigerant model add“B”，such as LF5506B.

Dimension

Pressure Switch

Wiring Instructions

Pressure Switch Pictures

External Thread: G 1/4”

（Standard Version）

External Thread: 7/16-20”

（Optional Version）

Installation Picture

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FAQS

Frequently Asked Questions (FAQ) About Pressure Switch

What is the main purpose of a pressure switch?

Used to monitor and control pressure.

How to install pressure switching equipment?

Secure and wire in place.

How to operate the pressure switch correctly?

Adjust the pressure action according to the set value.

What are the causes of pressure switch failure?

The diaphragm is damaged or the contacts are in poor contact.

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