Compact Pressure Transmitter

Compact pressure sensors are widely used in industrial equipment and automation systems because of their small size, easy installation, and low cost. They are especially suitable for applications with limited space or where fast response is required.

1). Water Treatment Systems

In water treatment and water supply systems, compact pressure sensors are commonly used for:

• Pipeline pressure monitoring
• Pump start/stop control
• Filter differential pressure judgment (compact differential pressure sensor)

Application characteristics:

• Medium is relatively clean
• Operating conditions are stable
• High requirements for cost control and stability

2). Air Compression and Pneumatic Systems

They are widely used in:

• Air compressor outlet pressure monitoring
• Pneumatic control systems
• Compressed air pipelines

Advantages:

• Fast response speed
• Suitable for dynamic pressure change conditions

3). Hydraulic Systems

Typical applications include:

• Hydraulic station pressure monitoring
• Construction machinery
• Injection molding machines and stamping equipment

Characteristics:

• Relatively high pressure ranges
• Higher requirements for stability and vibration resistance

4). Pumps and Pipeline Systems

Common applications in industrial equipment include:

• Pump inlet/outlet pressure monitoring
  (A damper should be added at the pump outlet position)
• Pipeline operating condition monitoring
• Prevention of dry running or blockage

Typical requirements:

• Compact structure for easy direct mounting
• Long-term stable operation

5). Automation Equipment and OEM Applications

Compact pressure sensors are especially suitable for integration by equipment manufacturers:

• Automatic production lines
• Packaging equipment
• Internal pressure control of machinery

Core advantages:

• Small size and easy integration
• Cost controllable, suitable for volume procurement

6). HVAC Systems

Applications include:

• Air conditioning system pressure monitoring
• Refrigeration equipment
• Fans and duct systems

Characteristics:

• Relatively stable working conditions
• High requirements for reliability and long-term operation

7). Food and Light Industry

(Hygienic Clamp Connection)

When material requirements are met, they can be used in:

• Food processing equipment
• Beverage production lines
• Clean piping systems

Points to note:

• Wetted material selection
• Hygienic grade, such as stainless steel and polishing requirements

With the advantages of compact structure, easy installation, and high cost performance, compact pressure sensors are widely used in water treatment, pneumatic systems, hydraulic equipment, and automation machinery, especially for OEM equipment and industrial applications with limited space.

Selecting a compact pressure transmitter means choosing the most suitable material, pressure range, structure, and output signal according to the actual application conditions.

At a minimum, the following parameters should be confirmed when selecting a compact pressure transmitter:

Process Medium:
The first step is to identify the characteristics of the measured medium, such as whether it is corrosive, viscous, contaminated, or prone to crystallization. This directly affects the choice of wetted materials and sealing structure. In standard applications, compact pressure transmitters are commonly supplied with a 316L stainless steel diaphragm and stainless steel process connection. However, for more aggressive media, special diaphragm materials or isolation structures may be required.

Pressure Type:
Before selection, it is necessary to determine whether the application requires gauge pressure, absolute pressure, or sealed gauge pressure measurement. Different pressure reference types correspond to different sensor structures, and selecting the wrong type may lead to inaccurate readings or an unsuitable installation.

Pressure Range:
The measuring range should be selected according to the actual operating pressure of the system. It should not be based only on the normal pressure value. In most cases, the full-scale range is recommended to be about 1.5 to 2 times the maximum operating pressure, so that the transmitter can maintain both measurement accuracy and a reasonable overpressure margin.

Overpressure Requirement:
Compact pressure transmitters have a smaller structure, but their sensing element still has an overpressure limit. Therefore, in addition to the normal operating pressure, the system’s possible pressure spikes, pump start-up pressure, or sudden surges should also be considered. This helps prevent long-term overload, sensor deformation, or premature failure.

Process Temperature:
Temperature is an important factor when selecting a compact pressure transmitter. If the process temperature is too high, it may affect the sensor stability, sealing performance, and service life. For high-temperature applications, a cooling element or impulse tube may be needed to reduce heat transfer to the transmitter. Low-temperature conditions should also be evaluated to ensure the sensor and cable materials remain suitable.

Output Signal:
Compact pressure transmitters are available with different output options, such as 4–20 mA, 0–10 V, 0–5 V, 1–5 V, or other customized signals. The output should be selected according to the receiving device, such as a PLC, controller, display instrument, or other automation system. Power supply requirements should also be checked at the same time.

Process Connection:
Compact pressure transmitters are usually installed through threaded connections, so the thread type and size must match the installation point. Common options include G1/4, G1/2, M20×1.5, 1/4 NPT, and 1/2 NPT. Confirming the correct connection in advance helps avoid installation problems and additional adapters.