Introducing the Dwyer SERIES 629 Pressure Transmitter: Comparing 629HLP vs 629C

Posted on: 08/07/2025

In HVAC, water treatment, compressed air, and industrial automation systems, accurate differential pressure measurement is critical for ensuring operational safety and efficiency.

One of the most popular product lines in this segment is the Dwyer SERIES 629, especially the 629HLP and 629C models.

Let’s explore both options in detail with DLK, the official Dwyer distributor in Vietnam, to help you make the best choice for your application.

1. Overview of the Dwyer SERIES 629

The Dwyer SERIES 629 is an electronic differential pressure transmitter designed to measure pressure in both liquid and gas media. It offers reliable performance in demanding industrial environments.

Key Features:

High accuracy: ±0.5% of full scale
Electronic outputs: 4-20mA or 0-10V
Corrosion-resistant materials for long-term durability
Compact and easy to install
Customizable configuration: multiple pressure ranges and units (psi, bar, kPa, etc.)

2. Comparison: Dwyer 629HLP vs. 629C

These two models from the SERIES 629 family are designed for different applications:

Feature	Dwyer 629HLP	Dwyer 629C
Pressure Range	Low pressure	Medium to high pressure
Application Focus	Clean air systems, ducting, cleanroom filters	Compressed air, hydraulic systems, industrial pipelines
Sensitivity	High sensitivity at low pressures	Robust design for high-pressure environments
Cost Efficiency	More economical for basic applications	Higher price point, but broader capabilities
Use Case	Where low-range precision is essential	Where durability and broader pressure ranges are needed

3. Which Model Should You Choose?

Choose the Dwyer 629HLP if you:

Need to measure low pressure - ideal for air handling, ventilation ducts, cleanroom filters
Require high sensitivity for small pressure changes
Want a cost-effective solution for non-high-pressure systems

Which Model Should You Choose?

Choose the Dwyer 629C if you:

Work with medium to high-pressure systems, such as compressed air or hydraulics
Need a rugged sensor for harsh industrial environments
Want the flexibility to expand pressure ranges in the future

Which Model Should You Choose?

4. DLK – Authorized Distributor of Dwyer Pressure Transmitters in Vietnam

DLK (Long Khanh Electrical Engineering Trading Co., Ltd.) is the official partner of Dwyer Instruments in Vietnam. We supply a full range of pressure transmitters, including the SERIES 629, 629HLP, and 629C models.

Why Choose DLK?