Pressure gauges are one of the most important instruments in any industrial process. Whether you work with steam, compressed air, water, chemicals, or gas systems, accurate pressure monitoring helps protect equipment, improve safety, and maintain process efficiency.
At Blanes Pressure Solutions, we help clients select the correct gauge for each duty condition. In this guide, we break down the most common types of pressure gauges and when to use each one.
Why Pressure Gauge Selection Matters
Using the wrong gauge can lead to:
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inaccurate readings,
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shortened instrument life,
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process instability,
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unnecessary maintenance,
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and in worst cases, safety incidents.
The right gauge depends on:
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pressure range,
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media type (clean, viscous, corrosive, gas, liquid),
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pulsation/vibration,
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required accuracy,
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installation environment,
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and whether output needs to be visual only or integrated into control systems.
1) Bourdon Tube Pressure Gauges
A Bourdon tube gauge is the most widely used mechanical pressure gauge in industry.
How it works
Inside the gauge, a curved metal tube (Bourdon tube) straightens slightly as pressure increases. This movement drives the pointer across the dial.
Best for
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medium to high pressure applications,
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general industrial use,
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utilities, pumps, compressors, hydraulic systems, and boiler lines.
Key advantages
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robust and reliable,
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cost-effective,
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available in a wide range of pressure classes,
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easy to install and maintain.
Limitations
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not ideal for very low pressure measurement,
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can be affected by severe vibration/pulsation without accessories (snubbers, dampeners, liquid fill).
2) Diaphragm Pressure Gauges
A diaphragm pressure gauge uses a flexible membrane that deflects under pressure.
How it works
Process pressure acts on a diaphragm element. The diaphragm’s movement is transferred to the pointer mechanism.
Best for
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low pressure ranges,
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viscous, contaminated, or corrosive media,
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applications where clogging risk is high,
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hygienic/process industries with diaphragm seals.
Key advantages
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suitable for challenging media,
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performs well at low pressures,
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can be combined with chemical seals for aggressive fluids.
Limitations
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can be more application-specific,
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material compatibility is critical for long service life.
3) Capsule Pressure Gauges
A capsule pressure gauge is designed for very low pressure measurement, typically in gas service.
How it works
Two diaphragms are joined to form a capsule. Small pressure changes cause the capsule to expand or contract, moving the pointer.
Best for
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very low positive pressures,
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low-pressure gas monitoring,
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leak detection and ventilation/airflow related systems (depending on configuration).
Key advantages
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highly sensitive at low ranges,
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good readability for fine pressure changes.
Limitations
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not suited for high-pressure applications,
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usually limited to clean, dry gases unless otherwise specified.
4) Digital Pressure Gauges
A digital pressure gauge uses an electronic sensor and displays readings on an LCD/LED screen.
How it works
A pressure sensor converts pressure into an electrical signal, which is processed and displayed digitally.
Best for
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applications needing higher readability and precision,
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calibration checks and test benches,
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logging/trending (on supported models),
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integration into modern maintenance and quality systems.
Key advantages
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easy-to-read display,
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often higher accuracy than analog,
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may include peak hold, min/max, alarms, and output options depending on model.
Limitations
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requires power (battery or external),
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electronics may need added protection in extreme environments.
How to Choose the Right Pressure Gauge
Before selecting a gauge, answer these questions:
- What is the normal working pressure?
Ideally, operating pressure should be around the mid-range of the dial for best performance. - What is the process media?
Corrosive or dirty media may require diaphragm-based designs or diaphragm seals. - Are there pressure spikes or vibration?
How to Choose Pressure Gauges
Consider liquid-filled gauges, snubbers, or pulsation dampening accessories. - What accuracy do you need?
Critical processes may require tighter accuracy classes or digital instruments. - What are the ambient conditions?
Temperature, humidity, dust, and washdown requirements influence case and material choice. - Do you need local indication only, or system integration too?
If you need data logging, alarms, or electronic output, digital options may be better.
Common Selection Mistakes to Avoid
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Choosing a range too close to max operating pressure,
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ignoring chemical compatibility,
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installing without vibration protection in high-pulse systems,
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selecting by price only instead of total lifecycle cost,
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using general gauges where application-specific gauges are required.
Read more on;
How to Choose Pressure Gauges
Blanes Gauge Product Range Overview
Why Work with Blanes Pressure Solutions
At Blanes Pressure Solutions, we do more than supply gauges—we help you select the right pressure instrumentation for your exact operating conditions. Our team supports clients across industries with reliable product guidance, technical insight, and practical solutions that improve uptime and safety.
If you’re unsure whether a Bourdon tube, diaphragm, capsule, or digital pressure gauge is best for your system, we can help you specify the correct option from the start.
We also offer SANAS traceable calibrations complete with a certificate, valid for 1 year on our premises.
Blanes Pressure Solutions supplies a comprehensive range of pressure measurement instruments.
Blanes Pressure Solutions was founded in 2002 to take over the pressure business of Blanes Instruments CC, and can trace its pedigree back to 1893, when Robert Blane left Scotland to make his fortune on the Witwatersrand.
For more information on placing orders, after care and maintenance services you can contact our Sales Manager Ronel Olivier on ronel@pressuresolutions.co.za or 011 422 1749.
