VARIOHM Pressure Sensors – Reliable Measurement in the Real World

🧩 Further Reading – Expanding the System-Level Measurement Perspective

Before diving deeper into pressure measurement, we recommend reviewing the complementary articles in this series that explore the system-level approach to sensor selection and reliable measurement design:

🧩 “VARIOHM Group – When Measurement Is a System, Not a Component”, presenting VARIOHM’s engineering approach to developing sensing solutions as part of a complete system architecture.

🧩 “How to Select Sensors for Harsh Environments: An Engineering Guide for Reliable Measurement in the Real World”, focusing on adapting sensing technologies to demanding environmental conditions and complex industrial applications.

🧩 “Industrial Position Sensors – When Position Is a System, Not Just a Number”, explaining why motion and position measurement require system-level thinking beyond simply choosing a sensor.

Together, these articles emphasize a key principle:

Reliable measurement is the result of correct system architecture – not just the selection of a single component.

Pressure measurement is one of the most widely used sensing technologies in industrial systems.

From hydraulic machinery and industrial equipment to medical devices, energy systems and special vehicles, pressure sensors play a critical role in monitoring, control and safety.

However, in many cases pressure measurement failures are not caused by the sensor itself.

They are caused by the system surrounding it.

Many engineers encounter the same situation:

The sensor worked perfectly during testing.
But once the system started operating, the readings became unstable.

In most cases, the problem is not in the sensor datasheet.

The problem lies in the engineering environment in which the sensor operates.

---

Pressure Is Not Just PSI

When selecting a pressure sensor, engineers often focus on basic parameters such as:

• Pressure range

• Accuracy

• Output signal (analog or digital)

But in real-world systems, pressure measurement is affected by many additional factors:

• Temperature variation

• Pressure spikes

• Hydraulic shock

• Media compatibility

• Mechanical mounting conditions

• Electromagnetic noise

• Long-term stability

A pressure sensor does not operate in isolation — it operates within a complex mechanical, thermal and electrical system.

---

Common Mistakes in Pressure Sensor Selection

Pressure sensors are often selected based on only three parameters:

• Pressure range

• Output signal

• Price

However, reliable long-term measurement depends on additional characteristics:

• Overpressure capability

• Burst pressure rating

• Thermal stability

• Chemical compatibility with fluids or gases

• Mechanical stress from piping connections

• Signal stability in industrial electrical environments

Ignoring these factors can lead to measurement drift, incorrect readings and even premature sensor failure.

---

VARIOHM Pressure Sensor Technologies

VARIOHM develops and supplies a wide range of pressure sensing solutions for industrial, mobile and OEM applications.

The portfolio includes:

Industrial Pressure Sensors

Precision and stable pressure measurement solutions for industrial machinery and process control systems.

Hydraulic Pressure Sensors

Designed for environments where high pressure loads and hydraulic shock are common.

Media-Resistant Pressure Sensors

Solutions for aggressive fluids and gases while maintaining long-term stability.

Compact OEM Pressure Sensors

Compact designs intended for integration into complex equipment and embedded systems.

VARIOHM pressure sensors are engineered to deliver stable performance in real operating environments — not only in laboratory conditions.

---

CASE STUDY – Pressure Instability in a Hydraulic System

The Challenge

A hydraulic system required accurate pressure measurement to regulate system performance.

During laboratory testing the sensor provided stable and accurate readings.

However, after installation in the field, unexpected fluctuations in the pressure signal appeared.

Root Cause

Engineering analysis revealed several contributing factors:

• Pressure spikes generated during system operation

• Environmental temperature variation

• Mechanical stresses transmitted through rigid piping

The issue was not the sensor itself — but how it was integrated into the system.

The Solution

Several adjustments were implemented:

• Selecting a sensor with higher overpressure capability

• Adding a pressure damping component at the sensor port

• Improving thermal isolation

• Revising the mounting configuration

The Result

After these modifications, pressure readings became stable and the system control performance improved significantly.

The conclusion is clear:

Reliable pressure measurement begins with proper system design.

---

VARIOHM Pressure Sensors – Available in Israel Through Amironic

Amironic is the official representative of VARIOHM in Israel, providing a wide range of pressure sensing solutions to multiple industries.

Through this collaboration, engineers in Israel receive:

• Guidance in selecting the appropriate sensing technology

• Evaluation of environmental operating conditions

• Support for sensor integration into complex systems

• Solutions designed for long-term measurement stability

Choosing the right pressure sensor is not only a technical decision — it is part of designing a reliable measurement system.

---

VARIOHM Pressure Sensor Solutions

VARIOHM offers a broad range of industrial pressure sensors designed for applications ranging from heavy hydraulic systems to compact OEM equipment, hydrogen systems, process industry installations and motorsport applications.

The portfolio includes several key product families.

---

Stainless Steel Industrial Pressure Sensors

This family is based on high-quality stainless steel pressure cells designed for demanding industrial environments.

Key characteristics:

• Wide pressure measurement ranges

• Long-term stability

• High pressure resistance

• Multiple output and connection options

Example Products

EPT3100
Range: 0 – 0.6 up to 2000 bar
17-4PH stainless steel pressure cell
Wide range of configuration options

EPT31HP – High Pressure
Range: 2000 up to 5000 bar
Designed for extremely high-pressure applications

EPT8100 – Low Pressure
Range: 0.06 up to 10 bar
316L stainless steel pressure cell
Available for absolute pressure measurement

---

Pressure Sensors for Mobile and OEM Applications

These sensors are designed for integration into equipment, special vehicles and industrial machinery.

They feature compact designs, high reliability and easy system integration.

Example Products

EPT9100 – Mobile Applications
Range: 4 up to 1000 bar
316L stainless steel pressure cell

EPT9200 – OEM Applications
Range: 10 up to 900 bar
Designed for easy integration into equipment

EPT31CN
Supports CANopen and J1939 protocols
Designed for advanced mobile systems

---

Hydrogen Application Pressure Sensors

With the growth of hydrogen energy technologies, specialized sensors compliant with strict regulations are required.

VARIOHM offers dedicated hydrogen pressure sensors with EC79 and EC406 approvals.

Example Products

EPT92H2
Range: 10 up to 1000 bar
Designed for OEM hydrogen systems

EPT31H2
Range: 1 up to 1000 bar
Wide range of configuration options

SMO31H2
Approved for road vehicles with E1 certification

SMO31H2PLd
Designed for functional safety applications
SIL2 / PLd compliant

---

Sensors for Specialized Applications

VARIOHM also provides solutions tailored to specific industries.

Example Products

CIT-F – Process Industry
Range: 0.1 up to 60 bar
Flush mount design for process environments

EPT3100R – Railway Applications
Designed to comply with railway standards

EPT31LE – IoT Applications
Ultra-low power consumption
Designed for IoT systems

EPT-LM – Level Measurement
Range: 0.1 up to 25 bar
IP68 sealed level measurement solution

---

Compact Sensors for Motorsport and Testing

For applications requiring small form factors and fast measurement response.

Example Products

EPT1200
12 mm outer diameter
Range up to 500 bar

EPT1400
14 mm diameter
Designed for testing and motorsport systems

EPT1500
Compact sensor with 15 mm outer diameter

EPT12R – High Temperature
Media temperature up to 200°C

---

Silicon Chip-Based Pressure Sensors

Cost-effective solutions for high-volume OEM applications.

Example Products

EPT2100
For non-aggressive gases and oils

EPT2200
Cost-effective brass housing design

EPT3200
Designed for very low pressure measurement

EPT2105
Low-cost sensor for high-volume demanding applications

EPT7100
Up to 10 bar pressure range
IP67 protection

---

FAQ – Industrial Pressure Sensors

How do you choose the right pressure sensor for a hydraulic system?

The sensor must match the pressure range, overpressure capability, operating temperature and environmental conditions of the system.

What is the difference between low-pressure and high-pressure sensors?

High-pressure sensors are designed to withstand extreme loads and hydraulic shock, while low-pressure sensors provide high accuracy within smaller pressure ranges.

How important is the material of the pressure cell?

Very important. Materials such as 316L stainless steel or 17-4PH stainless steel are selected depending on environmental conditions and media compatibility.

What causes pressure measurement drift over time?

Common causes include temperature variation, pressure spikes, mechanical stress and component aging.

Do pressure sensors require maintenance?

Most modern pressure sensors are designed for long-term operation with minimal maintenance, but proper installation and system design are essential for reliability.

---

Conclusion

Pressure measurement is not simply about selecting a sensor.

It is an engineering task involving mechanical, thermal and electrical considerations.

VARIOHM pressure sensors are designed to operate reliably within real industrial systems — not only under laboratory conditions.

A high-quality sensor is only the starting point.

Proper measurement system design is what truly makes the difference.