Guide to Selecting the Right Dwyer Sensors for Efficient HVAC and AHU Systems
Posted on: 08/07/2025
In HVAC (Heating, Ventilation, and Air Conditioning) systems and Air Handling Units (AHUs), sensors play a crucial role in monitoring and controlling parameters such as differential pressure, airflow, temperature, and humidity.
Selecting the correct Dwyer sensor not only enhances system performance but also reduces operating and maintenance costs.
With extensive experience distributing official Dwyer sensors in Vietnam, DLK provides this practical guide to help you choose the right sensor for each point in your HVAC or AHU system.
1. Essential Sensor Types in HVAC & AHU Systems
Typical measurement needs in HVAC and AHU include:
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Differential Pressure – e.g., across air filters, fans, ductwork
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Airflow – to monitor ventilation rate and fan performance
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Temperature & Humidity – for environmental control in rooms or ducts
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Duct and Chilled Water Pressure – for air or water line monitoring
Each application requires a specific sensor type.
2. Sensor Selection Guide by Installation Location
A. Measuring Differential Pressure in Ducts & Filters
Recommended Models:
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Dwyer SERIES 2000 (mechanical, Magnehelic® gauge)
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Dwyer MSX / Magnehelic® Series (durable and accurate)
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Dwyer SERIES 629 (with analog signal output)
Installation points:
Before and after HEPA filters, boost fans, or silencers
B. Measuring Room Static or Positive Pressure
Recommended Models:
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Dwyer SERIES 616KD (high accuracy, 4–20mA output)
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Dwyer TDFS / T6861H2WB (LCD display, user-friendly)
Applications:
Cleanrooms, operating rooms, positive/negative pressure control
C. Measuring Airflow in Ducts
Recommended Models:
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Dwyer SERIES 160 / 166T (pitot tubes with pressure sensors)
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Dwyer SERIES STA / DPT-FLOW (integrated pressure and flow)
Installation:
In main ducts or post-fan sections
D. Measuring Temperature and Humidity
Recommended Models:
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Dwyer SERIES RH-R (combined temperature/humidity sensor)
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Dwyer RHP Series (options with Modbus or BACnet output)
Application:
Room or duct environmental monitoring
E. Measuring Chilled Water Line Pressure
Recommended Models:
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Dwyer SERIES 629C or 682 (high-pressure liquid sensors)
Installation location:
On supply or return lines of chilled water systems
3. Key Considerations When Selecting a Dwyer Sensor
To select the most suitable model, consider:
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Criteria
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Recommendations
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Parameters to Measure
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Pressure, temperature, humidity, flow rate...
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Size Compatibility
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Do not choose excessively large sizes as it may cause significant errors
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Output Signal
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0–10V, 4–20mA, Modbus RTU, BACnet MS/TP...
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Material Suitability
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Choose anti-corrosion and dustproof materials suitable for HVAC/industrial conditions
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Brand and Certification
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Consider brands like Dwyer with certifications such as CE, RoHS, ISO
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Integration Capability
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Compatible with BMS, PLC, SCADA systems or centralized control devices
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4. DLK – Official Dwyer Sensor Distributor for HVAC & AHU in Vietnam
DLK (Long Khanh Electrical Engineering Trading Co., Ltd.) is the official distributor of Dwyer Instruments in Vietnam, specializing in sensor solutions for HVAC, AHU, cleanroom, and industrial applications.
With DLK, you get:
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Expert advice on selecting the right sensor for each system location
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Genuine products with full CO, CQ, and warranty
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Competitive pricing and on-site technical support for installation & calibration
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In-stock inventory for fast nationwide delivery
Contact DLK today for personalized consultation and a fast quote!