DIAPHRAGM PRESSURE GAUGE | PM-E.VN

What Is a Diaphragm Pressure Gauge?

A Diaphragm Pressure Gauge is a mechanical pressure measuring instrument designed for applications involving viscous, crystallized, corrosive, or contaminated media.

The gauge operates using an elastic diaphragm element that reacts to pressure changes and displays the measured value on the dial. Thanks to its special construction, diaphragm pressure gauges help protect the measuring mechanism from clogging and damage caused by aggressive or sticky fluids.

These gauges are widely used in industries such as:

• Chemical processing
• Petrochemical plants
• Food and beverage
• Pharmaceutical production
• Water treatment systems
• Power plants
• Environmental engineering

Diaphragm pressure gauges are ideal for industrial systems that require high durability and reliable pressure monitoring under harsh operating conditions.

Key Features of Diaphragm Pressure Gauges

Diaphragm pressure gauges are widely used because of the following advantages:

• Accurate measurement in viscous or crystallizing media
• Excellent resistance to clogging and corrosion
• Rugged and durable construction
• High overload protection capability
• Suitable for high vibration environments
• Easy maintenance and cleaning
• Available in threaded or flanged connections
• Stainless steel construction for corrosion resistance
• Stable operation in heavy industrial environments

Most diaphragm pressure gauges are manufactured according to EN 837-3 standards to meet modern industrial requirements.

Technical Specifications

Dial Sizes

• 63 mm
• 100 mm
• 150 mm
• 200 mm

Case Materials

• Stainless Steel 304
• Stainless Steel 316
• Brass

Connection Types

• Threaded connection
• Flanged connection

Thread Sizes

• 1/4”
• 3/8”
• 1/2”
• 3/4”
• 1”
• 1-1/4”

Mounting Styles

• Bottom mount
• Back mount
• Offset back mount

Gauge Types

• Liquid-filled
• Dry type

Protection Ratings

• IP65
• IP67
• IP68

Accuracy Classes

• Class 1.0
• Class 1.6
• Class 2.5

Pressure Ranges

• -600 mbar to +600 mbar
• Or customized according to application requirements

Operating Temperature

• -20°C to 65°C

Suitable Media

• Gas
• Steam
• Industrial liquids

Construction of a Diaphragm Pressure Gauge

A diaphragm pressure gauge typically consists of:

• Dial face
• Pointer
• Mechanical movement
• Bourdon tube
• Elastic diaphragm element
• Silicone oil filling
• Threaded or flanged process connection

The diaphragm element can be made from stainless steel, PTFE, Hastelloy, or tantalum for superior corrosion resistance in aggressive chemical applications.

Working Principle

When process pressure acts on the diaphragm, the diaphragm deforms according to the pressure level.

This movement is transmitted through silicone oil to the Bourdon tube mechanism inside the gauge. The mechanical movement then drives the pointer to indicate the measured pressure value on the dial.

The diaphragm design prevents the process media from directly contacting the internal measuring mechanism, increasing service life and operational reliability.

Advantages of Diaphragm Pressure Gauges

Compared with standard pressure gauges, diaphragm pressure gauges offer several benefits:

• Protect the measuring system from corrosive media
• Prevent clogging caused by viscous or crystallized fluids
• Withstand vibration and pressure fluctuations
• Long service life in industrial applications
• Easy maintenance and replacement
• Hygienic design suitable for food and pharmaceutical industries

In many applications, diaphragm pressure gauges can withstand overloads up to five times the full-scale value.

Industrial Applications

Diaphragm pressure gauges are commonly used in:

• Chemical plants
• Petrochemical industries
• Food processing systems
• Pharmaceutical manufacturing
• Power generation facilities
• Environmental technology
• Mining industries
• Water treatment systems
• Pressure vessels
• Industrial production lines

They are especially suitable for applications involving:

• Viscous fluids
• Corrosive chemicals
• Crystallizing media
• Hot steam
• High vibration conditions

Types of Diaphragm Pressure Gauges

Stainless Steel Diaphragm Pressure Gauge

Advantages include:

• Excellent corrosion resistance
• Long service life
• Suitable for chemical applications

Liquid-Filled Diaphragm Pressure Gauge

Benefits include:

• Better vibration resistance
• Extended mechanical lifespan
• More stable pointer movement

Flanged Diaphragm Pressure Gauge

Commonly used for:

• Large pipelines
• High-pressure systems
• Heavy industrial plants

PM-E.VN – Trusted Supplier of Pressure Gauges in Vietnam

PM-E.VN – Phuc Minh Engineering specializes in supplying pressure gauges, industrial valves, and instrumentation equipment for industrial systems throughout Vietnam.

Our products are imported directly from Japan, Korea, and Europe with full CO-CQ certification.

We distribute products from reputable brands such as:

• YAMAMOTO KEIKI
• WIKA
• WISE

Why Choose PM-E.VN?

• Genuine imported products
• Full CO-CQ documentation
• Competitive pricing for projects and distributors
• Professional technical support
• Wide range of pressure ranges and materials
• Fast nationwide delivery
• Application-focused consultation

Our engineering team is always ready to help customers select the most suitable pressure measurement solutions for industrial applications.

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Contact Us for Consultation & Quotation

📧 Email: info@pm-e.vn
☎ Hotline: 0902 720 814 – 0907 450 506 – 0902 601 875
🌐 www.pm-e.vn

PM-E.VN is committed to supplying high-quality diaphragm pressure gauges that meet industrial standards for chemical processing, food production, pharmaceutical systems, and harsh operating environments.