ADPS-03-2-N-C – Low Differential Pressure Switch for HVAC

1. Introduction to the ADPS-03-2-N-C Differential Pressure Switch
The ADPS-03-2-N-C is part of the Adjustable Differential Pressure Switch (ADPS) series from Dwyer Instruments – USA. It is designed to detect differential pressure between two points and trigger an output switch when the preset threshold is reached.
This model is especially suited for HVAC systems that require low-pressure differential monitoring, such as across air filters, inside air ducts, or for cleanroom pressure monitoring.

2. Technical Specifications of the ADPS-03-2-N-C
(Let me know if you want a full technical specification table in English)

3. Applications of the ADPS-03-2-N-C Differential Pressure Switch

HVAC Systems (AHU – FCU)
• Monitor pressure drop across air filters to trigger alarms when filters are clogged or dirty
• Measure pressure between supply and return ducts to assess system efficiency

Cleanrooms, Pharmaceutical and Electronics Plants
• Ensure correct positive or negative pressure between cleanroom zones
• Instantly alert in case of leakage or pressure deviation, maintaining ISO/GMP standards

Basement and Parking Ventilation Systems
• Monitor exhaust fan pressure for smoke removal and fire safety systems
• Control fan on/off based on preset pressure levels

Light Industrial Applications
• Detect blockages in air ducts or pipelines
• Monitor air filtration and dust collection systems

4. Key Advantages of the ADPS-03-2-N-C

Ultra-Low Pressure Detection (starting from 50 Pa)
Perfect for sensitive systems requiring precise low-pressure detection and fast response.

Simple and Accurate Setpoint Adjustment
Equipped with a built-in adjustment knob for easy threshold setting without additional tools.

Reliable SPDT Switch
Dry-contact SPDT output makes integration into control panels, PLCs, or alarms (buzzers/lights) straightforward.

Compact and Durable Design
PC plastic housing is impact-resistant and flame-retardant. Can be wall-mounted, panel-mounted, or installed inside AHUs.

Cost-Effective and Long-Lasting
Offers a balance between quality and cost. Designed to last in HVAC environments with minimal maintenance.

5. Installation Guide for the ADPS-03-2-N-C Pressure Switch

Step 1: Select Installation Location
Mount the switch on a wall or technical frame near the pressure monitoring point
Avoid areas with vibration or direct exposure to moisture

Step 2: Connect Pressure Ports
Connect “High” and “Low” pressure points using appropriate ports
Use Ø6 mm low-pressure tubing

Step 3: Set Pressure Threshold
Turn the built-in knob to the desired setpoint (between 50 – 750 Pa)
Use a reference gauge for more accurate calibration if needed

Step 4: Electrical Connection
Connect the three SPDT terminals (Common, NO, NC) to the control system or alarms
Test by creating pressure difference and check for switching signal

6. DLK – Official Distributor of Dwyer Pressure Switches in Vietnam
DLK Co., Ltd. is the official distributor of Dwyer Instruments in Vietnam. We specialize in providing:

• ADPS series pressure switches (ADPS-03-2-N-C, ADPS-05, ADPS-08, etc.)
• Differential pressure gauges, pressure and flow sensors
• Complete solutions for BMS, HVAC, cleanrooms, and smart buildings

Why choose DLK?
• Genuine products with CO – CQ certificates
• Expert technical advice to help choose the right model
• Ready stock and fast nationwide delivery
• On-site installation and support (on request)

Looking for a reliable low-pressure differential switch for filters, cleanrooms, or HVAC systems?
The ADPS-03-2-N-C is your ideal choice – simple, accurate, and cost-effective.