长沙LPS-M3 Series Pressure Switch
● Fully welded diaphragm, zero leakage
●Mechanical principle, no power supply required
● High-quality microswitch with minimal dead zone
● The process interface is versatile, and both flanges and threads can be customized.
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Product Description
Product Overview Product overview
The LPS-M3 series diaphragm pressure switches are manufactured by applying a secondary diaphragm oil-filling process based on conventional pressure switches. The wetted parts can be equipped with different diaphragms tailored to the specific characteristics of the process medium, making them ideal for handling challenging conditions such as corrosive media, highly viscous substances, materials prone to crystallization, or even situations where particulate matter might clog the pressure-tapping ports. Inside the diaphragm, an inert oil is filled, serving as a reliable transmission medium—ensuring that corrosive fluids come into contact only with the specially engineered diaphragm material. The deformation of the diaphragm is then transmitted via the oil to the sensor, enabling precise detection of medium pressure and triggering various alarm actions or interlock controls, such as high-pressure alarms, low-pressure alarms, high-high-pressure alarms, and low-low-pressure alarms. Additionally, the setpoints are adjustable, eliminating the need for external power supply, while the contacts boast a large capacity, significantly enhancing user convenience in field applications. These switches are widely used across industries—including petroleum, chemical processing, metallurgy, power generation, sugar production, pharmaceuticals, and more—where differential pressure control is essential.
Measurement Principle Principle
A diaphragm-type pressure switch is a mechanical pressure switch that uses the mechanical deformation of a diaphragm to control the closing or opening of electrical contacts. When the pressure of the measured medium changes, the diaphragm undergoes a corresponding displacement. This displacement is then transmitted via a linkage mechanism to a microswitch. Once the displacement reaches a preset value, it actuates the microswitch, causing its contacts to either close or open—thus signaling the pressure level. Adjustable pressure switches allow users to fine-tune the relationship between the linkage mechanism and the microswitch contact travel, enabling precise pressure control at either a fixed value or within a specific range, thereby achieving the desired operational purpose.
Performance Metrics TECHNICAL PARAMETERS
Measurement medium: Gas or liquid (For highly corrosive applications, please confirm beforehand).
Measurement range: 0–40 MPa
Working viscosity: ≤10E3 m²/s
Housing material: Die-cast aluminum, epoxy resin coating, with a sealing gasket on the outer cover
NEMA Protection Rating: Meets NEMA 4X requirements
Set value accuracy: ±0.5%
Repeatability accuracy: <1%
Pressure interface: Standard M20×1.5 external thread or flange; special interfaces available upon request.
Electrical interface: M20×1.5 internal thread; special interfaces available upon request
Switch output: One single-pole double-throw (normally open + normally closed) output;
Switching component: Microswitch
Ambient temperature: -40°C to +70°C
Environmental humidity: 5%–95%
Cycle Life: 1 million cycles
Protection Rating: IP67
Explosion-proof rating: Exde IIC T6 Gb
Dust Explosion Protection: ExtD A21 IP66 T80℃;
Contact capacity: Standard type: 380V, 15A; Explosion-proof type: 380VAC, 5A;
External dimensions APPEARANCE OF SIZE
Installation Requirements INSTALLATION
1. Weld the pressure-tapping pipe, and it’s best to install a shut-off valve on the pipe. Leave connecting threads corresponding to the switch, so that the switch can be easily removed during maintenance.
2. Install the switch in a location with minimal vibration and temperature fluctuations. An appropriate installation spot can effectively prevent moisture from entering the housing. If the switch is to be installed under harsh operating conditions, it must be mounted vertically (with the pressure connector facing downward). Please avoid installing it in environments outside the specified temperature range.
3. Special note: When installing or removing, never directly twist the outer casing to secure or detach the switch. Instead, use a wrench to tighten or loosen the connecting hexagonal (or flat) fitting at the joint.
Tianjin Ling Yu Technology Co., Ltd.
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