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LPS—N3 Smart Pressure Switch
● Multiple-channel digital output
● Display pressure value directly on-site
● Multiple alarm methods can be set
● Set action values with buttons
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Product Description
Product Overview Product overview
The LPS-N3 series electronic pressure switch is a next-generation, intelligent product capable of acquiring pressure readings from on-site pipelines and pressure vessels. It features local display, switch-action output, and remote signal transmission, making it convenient for downstream control and data collection. The local switch control output is provided as a dry-contact SPDT, while the analog output supports signals such as 4-20mA current and RS485 communication. Compared to mechanical pressure switches, this model offers exceptional ease in adjusting setpoints. Additionally, it allows users to configure multiple alarm modes, including single-point alarms, alarms triggered within the upper and lower limit ranges, or alarms activated outside these ranges. This versatile product is widely used across various industries—such as petroleum, chemical processing, metallurgy, power generation, sugar production, and pharmaceuticals—where precise pressure control is essential.
Performance Metrics TECHNICAL PARAMETERS
Power supply: 18–32 VDC, typical value: 24 VDC
Measurement media: oil, water, gas, and other media compatible with stainless steel;
Measurement ranges: Negative pressure type: -0.1 to 0 MPa; Differential pressure type: 0–2 kPa; Positive pressure type: 0–60 MPa; (Custom options available for higher requirements)
Measurement accuracy: 0.25%FS; (Higher accuracy available upon customization)
Overload Capacity: 2x Full-Scale Pressure:
Analog output: 4-20mA;
Switch outputs: 2-channel SPDT relays; 4-channel SPDT relays
Contact capacity: 250VAC, 3A / 24VDC 1A;
Communication method: RS485;
Load capability: Current type ≤ 500Ω, voltage type ≥ 250 kΩ;
Threaded connection: M20×1.5 (customizable based on site requirements);
Electrical Interface: Terminal wiring on the rear panel; *Some models support M12*1 connector output;
Temperature Drift Coefficient: Within the specified operating temperature range, for every 10°C change in ambient temperature, the output variation is ≤ ±0.05% of the full scale; annual drift < ±0.3%.
Long-term stability: ±0.1%FS/year;
Housing material: Stainless steel housing
Housing Protection: IP65
Operating temperature: -20～85°C
Storage temperature: -40～100°C
Relative humidity: 0–95% RH
External dimensions APPEARANCE OF SIZE
Installation Requirements INSTALLATION
1. The pressure controller can be directly installed on the component being tested. To facilitate installation and maintenance, it is recommended to add a shut-off valve between the component and the pressure controller. In cases of vibration or impact,
Larger environments can achieve mechanical decoupling by installing a hose at the pressure controller connector.
2. A sealing ring should be installed between the pressure controller connector and the pipe fitting or shut-off valve. For flush-head pressure controllers, the internal thread depth of the pipe fitting or shut-off valve must exceed 25 mm.
3. In general, the pressure controller should be installed vertically, facing upward relative to the horizontal surface. During installation, use a wrench to tighten the controller by turning the hexagonal nut located at the bottom of the pressure controller.
4. When the range is less than 100 kPa, it must be installed vertically.
Please note:
1. Do not insert sharp objects or hard materials into the pressure port, as this may damage the sensor's pressure diaphragm. Additionally, the pressure diaphragm is permanently welded to the housing, making repair impossible.
Improperly pressing the diaphragm, as well as product quality issues caused by abnormal usage—such as media containing particles, static overloading, or dynamic pressure shocks—is not covered under our warranty. Therefore, users are strongly advised to take extra care in protecting the diaphragm during both installation and operation.
2. For areas prone to frequent lightning strikes, it is recommended to install lightning protection devices along the lines.
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