Universal Pressure Transmitter: The “Standard” Instrument for Petrochemical and Power Industries

In industrial applications, pressure transmitters are among the most widely used measuring instruments. Whether in oil pipelines, chemical reactors, water supply networks, or hydraulic systems, they are almost always essential.Thanks to their mature technology and broad applicability, general-purpose pressure transmitters have become a standard instrument in industrial process control.

At the heart of a Universal Pressure Transmitter is a high-performance pressure sensor core. Through amplification circuits, temperature compensation, and nonlinearity correction, the transmitter converts the pressure of the measured medium into a standard electrical output signal.

Its application range covers more than 80% of conventional industrial pressure measurement scenarios, including:

• Pressure monitoring in petrochemical pipelines
• Steam and water pressure measurement in power systems
• Water supply networks and wastewater treatment
• Hydraulic equipment and construction machinery
• HVAC systems and general industrial automation

The SMP4015-24 Series offers a pressure range of -100 kPa to 35 MPa and supports absolute pressure, gauge pressure, and sealed gauge pressure. Output options include 0.5–4.5 VDC and 4–20 mA.

Its flush diaphragm design is suitable for measuring viscous media or media containing particles, making it a good choice for air compressors, pneumatic equipment, hydraulic systems, and other general industrial applications.

The SMP4030 Series covers a pressure range of -100 kPa to 70 MPa and supports multiple communication protocols, including:

• RS485 Modbus
• 4–20 mA + HART
• IO-Link
• CAN Bus

It supports remote configuration and device diagnostics, making it suitable for applications that require digital monitoring and management, such as petrochemical systems, water conservancy and hydrology, and mechanical hydraulic systems.

The SMP4021 Series offers a response frequency of up to 10 kHz, making it suitable for capturing rapid pressure changes such as hydraulic shock and pulsating flow.

With a pressure range of -100 kPa to 70 MPa and multiple voltage output options, it is widely used in hydraulic and pneumatic control systems and other dynamic pressure measurement applications.

The SMF6352 Series uses a sapphire sensor and a fully welded structure. It can withstand media temperatures from -55°C to +400°C and offers a pressure range of up to 100 MPa.

It is specifically designed for harsh high-temperature and high-pressure environments, including:

• Petrochemical processing
• Power generation systems
• Metallurgical applications
• Boiler steam pressure monitoring

The SMP6602 Series is designed for hydraulic pressure measurement. It covers a pressure range of -100 kPa to 70 MPa and supports multiple output options, including:

• 4–20 mA
• 0–5 V
• 0.5–4.5 V
• 0–10 V

Its rugged structure makes it suitable for construction machinery, vehicle-mounted equipment, and industrial hydraulic systems operating in high-vibration environments.

Choosing a general-purpose pressure transmitter is not simply a matter of selecting the most expensive model. The right choice should match the actual application requirements, including the medium, temperature range, system pressure, and signal output requirements.

A practical four-step selection process is:

•  Confirm the pressure type and pressure range
• Check medium compatibility and operating temperature range
• Select the output signal type based on system requirements
• Confirm the process connection and electrical interface

If you need selection advice based on a specific project, feel free to contact our technical team for support.