Low pressure switch adopts diaphragm sensor. The setting value of the controller is adjustable, and the adjustment range is -16KPa—2.5Mpa.

Features of low pressure switch

1. Mechanical switch, no need for power supply, easy to use
2. There are normally open and normally closed contacts
3. Adjustable pressure alarm point
4. Suitable for occasions with explosion-proof requirements
5. Easy to use, stable work and long mechanical life

Specifications of low pressure switch

Working parameters	normal type	Explosion-proof
Working viscosity	＜1×10-3m2/s	＜1×10-3m2/s
Switching element	Micro Switch	Sealed switch
Explosion-proof grade	/	Exed II CT4~T6
Enclosure rating	IP65	IP54
Ambient temperature	-20℃~50℃	-20℃~50℃
Medium temperature	0~120℃	0~120℃
Installation location	/	Pressure vertically downward
Vibration resistance	ZNC-Y500: 40m/s²	Max. 20m/s²
Repeatability error	≤1.5%	≤1.5%
Contact rating	AC 220V, 6A (resistive)	DC 250V, 0.25A (resistive), 60W max. AC 250V, 5A (resistive), 1250VA max.

Set value reference table

No.	Corresponding setting value adjustment range			Pressure	Corresponding dimensions
	B	K	W
1	0~2.5 (Kpa)	0~2.5 (Kpa)	-16~0 (Kpa)	50(Kpa)	Normal: 01 Explosion-proof: 04
2	0~6 (Kpa)	0~6 (Kpa)	-10~0 (Kpa)
3	0~16 (Kpa)	0~16 (Kpa)	-6~0 (Kpa)
4	0~25 (Kpa)	0~25 (Kpa)	-2.5~0 (Kpa)
5	0.005~0.06 (Mpa)	0.005~0.06 (Mpa)	-1.6~0 (Kpa)	1.5(Mpa)	Normal: 02 Explosion-proof: 05
6	0.005~0.1 (Mpa)	0.005~0.1 (Mpa)	0~0.6 (Kpa)
7	0.005~0.16 (Mpa)	0.005~0.16 (Mpa)	0~1.1 (Kpa)
8	0.005~0.25 (Mpa)	0.005~0.25 (Mpa)	0~1.6 (Kpa)
9	0.03~0.4 (Mpa)	0.03~0.4 (Mpa)		4(Mpa)	Normal: 03 Explosion-proof: 06
10	0.03~0.6 (Mpa)	0.03~0.6 (Mpa)
11	0.05~1 (Mpa)	0.05~1 (Mpa)
12	0.1~1.6 (Mpa)	0.1~1.6 (Mpa)		5(Mpa)
13	0.1~2.5 (Mpa)	0.1~2.5 (Mpa)

Remarks: ① The meaning of the pressure resistance value: even a short pressure peak cannot exceed this value.
② The corresponding external dimensions of the W-type controller are unified as ordinary: 01, explosion-proof: 04.

You may like: Explosion Proof Pressure Transmitter for Hazardous locations

Working principle of low pressure switch

When the system pressure and the rated pressure are too high or too low, the disc in the sensor will move instantaneously. Thereby, the switch joint is pushed on or off by the connected guide rod.

In short, it is compared with the rated value through the test situation of the measured pressure. When there is a change, a working effect will be produced, and the free end of the elastic element will be displaced. Push the switching element directly or after comparison. Change the on-off state of the switching element to achieve the purpose of controlling the measured pressure.

The commonly used components of pressure switches mainly include four categories: diaphragm, diaphragm, single coil spring tube and bellows.

Extended reading: Miniature Pressure Switch

The role of low pressure switch

Because pressure switches have relatively high accuracy and stable performance, low-pressure pressure switches are widely used in automobiles, water purifiers, power development and other fields. These fields are mainly applied to low-voltage protection switches of automobiles, low-voltage switch appliances of power equipment, and low-voltage control switches used in pressure systems.

Among them, in the automotive field, it means that when the voltage provided by the car to the on-board power supply is lower than how much, the power supply will automatically shut down to achieve a protection function. As a commonly used electrical component, low-voltage car switches can prevent damage to the power supply equipment of the car and ensure the normal ignition of the car.

The low-pressure switch in the pressure system achieves the working effect according to the water supply pressure of the entire system. It is mainly to cut off the entire circuit when there is no water or the pressure is too small to achieve the purpose of protecting the water pump.

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