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LPS-F1 Diaphragm-Type Negative 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-F1 series diaphragm-type negative-pressure pressure switch features a fully welded stainless steel diaphragm design, offering a simple and user-friendly layout with fewer potential failure points. It effectively prevents liquid leakage and false operations. Primarily used in vacuum control applications, the device has an adjustable setpoint and requires no separate power supply. Additionally, it boasts a large contact capacity, making it exceptionally convenient for on-site installation and use. This product is widely applied across various industries—including petroleum, chemical, metallurgy, power generation, sugar production, pharmaceuticals, and more—where negative-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, which 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 consult us).
Measurement range: -100–0 kPa
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 1/2 NPTF female thread, M20×1.5 male thread; 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;
Ambient temperature: -40°C to +70°C
Environmental humidity: 5%–95%
Cycle Life: 1 million cycles
Protection Rating: IP67
Explosion-proof rating: Ex de 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 threaded connections corresponding to the switch, allowing for easy removal of the switch 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 will 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.
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