Pressure gauges – manometers

Professional pressure gauges for industrial and technical use

Pressure gauges, often also referred to as manometers, are key instruments in industrial, laboratory and technical environments, allowing accurate pressure monitoring in gases and liquids. This category includes professional measuring devices designed for precise measurement, reliable operation and long service life even under demanding working conditions. Various types of manometers enable use in mechanical engineering, pneumatics, hydraulics, process technology, HVAC applications, maintenance and many other areas where pressure monitoring is essential for system safety and efficiency.

What pressure gauges are and how they work

Pressure gauges are instruments that measure pressure in liquids or gases relative to a reference pressure (atmospheric, vacuum or absolute). The most widely used are analog manometers with a dial and pointer showing the measured value in real time. They operate on the deformation of an elastic element—usually a Bourdon tube—which bends under pressure and moves the pointer.

Other types include:

• digital manometers – provide extremely accurate readings on a display
• vacuum manometers – measure pressures below atmospheric pressure
• differential manometers – measure the difference between two points in a system
• absolute manometers – measure pressure relative to a perfect vacuum

Such diversity makes them suitable for a wide range of industrial applications, from pneumatic system monitoring to process pressure control in production.

Professional selection of pressure gauges based on application needs

We offer an extensive range of pressure gauges that differ in design, measuring range, material and accuracy. The selection includes:

• standard analog manometers for general industrial use
• precision manometers for laboratory and calibration applications
• contact manometers with alarm output
• glycerine-filled manometers that dampen pointer vibration for stable readings
• dry manometers suitable for less demanding environments

Glycerine inside the manometer prevents pointer vibration and protects the internal mechanism, which is crucial for accurate readings in environments exposed to shock or pulsating pressure.

Selection by housing material

Our pressure gauges are available in various materials adapted to environmental requirements:

• stainless steel (inox) – resistant to corrosion, aggressive media and outdoor conditions
• steel – robust choice for general industrial use
• brass – excellent for non-aggressive media and pneumatic applications
• plastic – suitable for light-duty applications and basic measurement tasks

Choosing the correct material is especially important in environments with high humidity, chemicals or mechanical loads.

H2: Filling – glycerine or dry manometer

We offer two main types:

• dry manometers – for stable conditions and non-demanding applications
• glycerine-filled manometers – for industrial environments with vibration, pulsation or pressure fluctuations

Glycerine increases pointer stability, reduces mechanical wear and extends the instrument’s service life.

Various connections for easy installation

Pressure gauges also differ in the position of the connection, enabling flexible installation:

• axial connection (rear) – ideal for panel-mount applications
• radial connection (bottom) – most common for direct pipe installation

Available thread sizes:

• G 1/2"
• G 1/4"
• G 1/8"

This ensures compatibility with pneumatic and hydraulic systems from various manufacturers.

Manometer diameters

Standard available diameters:

• 40 mm
• 50 mm
• 63 mm
• 80 mm
• 100 mm
• 160 mm

Smaller diameters are suitable for limited installation spaces, while larger ones offer better readability and are used in process applications.

Accuracy classes

Pressure gauges are categorised into accuracy classes. The most common are:

• class 0.6
• class 1.0
• class 1.6
• class 2.5

A lower number means higher accuracy. Precision manometers are used where even minimal deviation is critical.

Extremely wide selection of measuring ranges

We offer a very broad selection of measuring ranges, covering both vacuum and high pressure.

Vacuum ranges:
from –1 to 0 bar

Combined ranges:

• 1 to 1.5 bar
• 1 to 3 bar
• 1 to 5 bar
• 1 to 9 bar
• 1 to 15 bar
• and extended negative ranges.

Overpressure ranges:

Overpressure ranges are available from 0 to 0.6 bar, 0 to 1 bar, 0 to 1.6 bar, 0 to 2.5 bar, 0 to 4 bar, 0 to 6 bar, 0 to 10 bar, 0 to 16 bar, 0 to 25 bar, 0 to 40 bar, 0 to 60 bar, 0 to 100 bar, 0 to 160 bar, 0 to 250 bar, 0 to 315 bar, 0 to 400 bar, 0 to 600 bar and up to 0 to 1000 bar.
Such a wide range makes these instruments suitable for pneumatic, hydraulic, process, laboratory and high-pressure industrial systems where precision and stability are essential.

Installation of pressure gauges

Manometers can be installed in several ways depending on the system and environment:

• threaded connection – screwed directly into the pipeline
• panel mounting – for control panels and industrial control units
• flange mounting – for larger systems or specific applications
• wall mounting – when remote pressure indication is required

Correct and stable installation is crucial for accurate measurement, which is why the mounting method must be considered when selecting a gauge.

Why choose pressure gauges from M&M Intercom

We offer verified pressure gauges and manometers built from high-quality materials, precise mechanisms and reliable components.

Advantages of our selection:

• wide range of measuring scales
• various filling types
• accuracy classes for industrial or laboratory use
• durable housings for long-term use
• support from experienced technical staff
• fast delivery and stable stock availability

Professional consulting and technical assistance

Pressure measurement is a key element of system safety and efficiency. Our team provides:

• help selecting the right manometer according to media, pressure and conditions
• technical explanation of standards and accuracy classes
• advice on installation and mounting
• optimisation of measuring systems in industrial processes

We ensure that pressure gauges are properly installed, safe to use and function reliably throughout their entire service life.

 

10 Most Frequently Asked Questions (FAQ)

1. What are pressure gauges and where are they used?
Pressure gauges (manometers) are instruments for measuring pressure in gases or liquids. They are used in pneumatic, hydraulic, process, heating, laboratory and technical systems where accurate pressure monitoring is essential for safe operation.
2. What is the difference between a manometer and a vacuum gauge?
A standard manometer measures pressure above atmospheric pressure, while a vacuum gauge measures pressure below atmospheric pressure. Some models can measure both.
3. When should a glycerine-filled manometer be used?
Glycerine-filled gauges are recommended where vibration, pulsation or shock is present. The glycerine stabilises the pointer, prevents fluctuations and extends the instrument’s service life.
4. What is the difference between axial and radial connections?
Axial connections are located at the rear and are suitable for panel mounting. Radial connections are located at the bottom and are most common for direct pipe installation.
5. How do I choose the correct measuring range?
The maximum measuring range should be about twice the expected working pressure. This increases accuracy and extends the instrument’s service life by avoiding overload at the upper limit.
6. What does the accuracy class mean?
The accuracy class (e.g., 1.0, 1.6) defines the allowed measurement deviation. Lower values indicate higher accuracy. Precision classes are used for laboratories, calibration and sensitive processes.
7. How does the housing material affect the gauge?
Stainless steel provides the best resistance to corrosion and aggressive media. Brass is suitable for non-aggressive media. Plastic is used for basic applications. Steel housings are suited for robust industrial environments.
8. How should a manometer be installed correctly?
It must be firmly attached, aligned and protected against vibration. Installation can be threaded, panel-mounted, flange-mounted or wall-mounted. Ensure tight connections and protection against mechanical impacts.
9. Can very high pressures be measured?
Yes. Our selection includes pressure gauges up to 1000 bar for high-pressure hydraulic systems, presses and special process applications.
10. When are precision manometers recommended?
Precision gauges are used when high accuracy is required—laboratories, calibration, pharmaceutical industry, energy sector and process applications. They offer minimal deviation and improved stability.

E-mail: [email protected]
Tel: +386 1 29 27 960