Differential pressure switch ADPS-04-2-N-C, DLK imported directly from Dwyer

The ADPS-04-2-N-C differential pressure switch from Dwyer belongs to the ADPS Series – a device specialized for monitoring air differential pressure in HVAC systems, BMS, ventilation, or air-filtration applications. It is designed to detect pressure differences between two points and activate an SPDT contact to trigger alarms, control fans, dampers, or automation systems when the differential pressure exceeds the preset threshold. DLK Vietnam supplies the genuine ADPS-04-2-N-C model, ensuring all specifications strictly follow the original datasheet and are ready for MEP, HVAC, and industrial projects. With a compact construction, simple installation, and compatibility with non-combustible dry air, the ADPS-04-2-N-C is an effective choice for many applications.

Operating Principle
The ADPS-04-2-N-C uses a silicone diaphragm to sense the pressure difference between the high-pressure and low-pressure ports. When the differential pressure exceeds the value set by the adjustment knob, the internal mechanism actuates and switches the SPDT contact. This converts the mechanical signal into an electrical output that can be connected to control panels, PLCs, fans, or valves. When the pressure drops below the setpoint, the device resets automatically. The setpoint adjustment uses a dual-scale knob (inches WC and Pascal), making it easy for technicians to calibrate without requiring an external gauge.

Practical Applications by Industry
• HVAC and Air-Conditioning Systems: The ADPS-04-2-N-C can monitor differential pressure across AHU filters. When the filter becomes dirty and causes an increase in differential pressure, the switch triggers an alarm for timely cleaning or replacement. This helps maintain air quality, protect fans, and reduce energy consumption.
• Ventilation and Cleanroom/Airflow Control (Hospitals, Labs, Production Cleanrooms): The device ensures positive or negative room pressure remains within specification. When differential pressure deviates, the switch alerts operators to prevent contamination or cross-infection.
• Industrial Cooling and Equipment Ventilation: Used to monitor airflow in cooling systems for machinery or control cabinets. When airflow decreases (due to clogged ducts or weak fans), the switch activates backup ventilation or sends a maintenance alert.
• Damper/Valve Control and Fire/Smoke Protection Systems: The device can monitor pressure differences between zones to automatically open or close dampers and air intakes/exhaust outlets, improving safety and operational efficiency in buildings and storage areas.

Benefits of Using the Product
Using the ADPS-04-2-N-C provides several practical advantages. It ensures accurate differential pressure monitoring, improving the stability of HVAC, ventilation, and air-processing systems. It supports predictive maintenance by notifying when filters are dirty, avoiding reduced efficiency and increased energy consumption. When integrated into automated systems, it reduces manual intervention and increases operational safety. With materials suitable for non-combustible dry air and an IP54 enclosure, the device is ideal for industrial plants, factories, and commercial buildings—offering durability and reduced maintenance needs.

Key Technical Specifications Summary

How to Select the Right Model
For low-range differential air pressure monitoring (filter status, HVAC ducts, cleanrooms), the ADPS-04-2-N-C with a range of 0.12–1.60 inH₂O (≈30–400 Pa) is an appropriate choice. For higher ranges, other models in the ADPS Series may be more suitable. Ensure that the media is non-combustible dry air and that the environment aligns with the device’s temperature and pressure limits. When an SPDT signal is needed for alarms or fan/damper control, the ADPS-04-2-N-C fulfills the requirement. For best longevity, the device should be installed vertically with pressure ports facing downward, away from moisture.

Why Buy from DLK Vietnam
DLK Trading Service Co., Ltd. is the official importer and distributor of Dwyer products in Vietnam, supplying the ADPS-04-2-N-C with correct and certified specifications. Purchasing from DLK ensures product authenticity, stable quality, and clear warranty policies. DLK also offers technical consulting for HVAC, BMS, and industrial applications. Local stocking and support make installation and commissioning easier for contractors and system integrators. More details can be found at: Differential Pressure Switch ADPS-04-2-N-C

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