How to Select the Right Dwyer Pressure Sensor for Your Project

A Complete Guide to Choosing the Right Dwyer Pressure Sensor for Your Project

Posted on: 18/05/2025

In HVAC, BMS, and industrial automation systems, selecting the right pressure sensor is crucial for ensuring system stability, minimizing investment costs, and extending equipment lifespan.

Dwyer Instruments (USA) offers high-quality, globally trusted pressure sensors—ideal for residential, commercial, and industrial projects.

So how do you choose the correct Dwyer pressure sensor model for your specific application? Let DLK, the official Dwyer distributor in Vietnam, guide you through the selection process.

1. Identify the Environment and Pressure Type

Start by determining the medium and type of pressure you need to measure (gauge, absolute, or differential).

Type of Differential Pressure Sensor	Application Environment	Suitable Sensor Type
Absolute pressure	Air duct, exhaust fan	Series 626, 628
Gauge pressure	Air/water piping	Series 626, 628, 629C
Differential pressure	AHU, FCU, filters, fans	Series 629C, 616KD, 605
Low pressure (Pascal)	Clean room, laboratory	Series 616KD, Magnehelic

Notes:

For air and steam, choose sensors with corrosion-resistant enclosures and heat tolerance.
For liquids, sensors should have chemical-resistant diaphragms (e.g., 316L stainless steel).

2. Define the Required Pressure Range

Choose a pressure range that fits your application for optimal accuracy and performance.

Examples:

Air pressure in HVAC ducts: 0 – 1,000 Pa
Chilled/hot water systems: 0 – 6 bar
Compressed air lines: 0 – 10 bar or higher

DLK Tip: The ideal operating pressure should be 40–60% of the sensor’s full range.

3. Select the Appropriate Output Signal

Dwyer pressure sensors come with several output options:

4-20mA: Highly stable, noise-resistant, ideal for long-distance PLC/SCADA connections
0-10VDC: Suitable for basic controllers or short-distance transmission
RS485/Modbus (less common): Best for digital monitoring systems

DLK Suggestion: For systems with a centralized control panel, 4-20mA is usually the most compatible and reliable choice.