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5 Types of Pressure Transmitter

Table of Contents

Pressure transmitters are vital instruments used in various industries to measure and transmit pressure readings accurately. These devices play a critical role in converting pressure into analog electrical signals, offering valuable data for monitoring and control purposes. As a pressure transmitter parts supplier, we introduce the pressure transmitter in detail.

What is pressure transmitter?

A pressure transmitter is a sophisticated device designed to measure pressure levels within a system and convert this information into a proportional electrical signal.These flow meters measure and transmit pressure data accurately, ensuring safe system operation. This signal can then be utilized for monitoring, control, and analysis in a wide array of industrial applications.

Pressure transmitter parts

Pressure transmitters usually consist of the following parts:

  • Pressure sensor: It is the core component of the pressure transmitter, usually using piezoresistive, capacitive, or piezoelectric sensors.
  • Electronic circuit board: Contains signal processing circuitry for processing the signals output by the sensor.
  • Process connection: used to connect the transmitter to the measuring system, such as flange or threaded connections.
  • Shell: Protects internal components from the outside environment.
  • Display and operator interface: used to display measurement data and configure transmitter settings.
  • Electrical connections: such as cable interfaces for power and signal output.


CNC machined components in pressure transmitters, such as pressure sensors, process connections, and housings, usually involve the following CNC machining processes:

  • Turning: This is a common CNC machining method suitable for making shaft-shaped parts or housings. For example, housings and process connection components may be machined through CNC lathes to obtain precise sizes and shapes.
  • Milling: Milling is another common CNC machining method suitable for machining complex shapes and details. For example, some parts of a pressure sensor may require fine machining with a CNC mill.
  • Drilling and Tapping: To machine threaded connections and mounting holes, CNC drilling and tapping machines may be used. These processes are particularly important for process connections and electrically connected components.
  • Grinding: Used to achieve extremely high surface finish and dimensional accuracy, possibly for processing the sensitive elements of a sensor or the sealing surface of a housing.


These CNC machining processes provide a high degree of accuracy and repeatability, which are critical for manufacturing critical components of precision instruments such as pressure transmitters.

pressure transmitter

Exploring Different Types of Pressure Transmitters

Pressure transmitters come in various types, each designed to cater to specific industrial needs and measurement requirements.

  • Differential Pressure Transmitters
  • Absolute Pressure Transmitters
  • Gauge Pressure Transmitters
  • Sealed Pressure Transmitters
  • Wireless Pressure Transmitters

Differential Pressure Transmitters

Differential Pressure Transmitters serve a crucial role in measuring the variance between two different pressures. These transmitters typically consist of two input ports, where the pressure difference is sensed and measured. They are extensively utilized in various applications such as flow measurement, monitoring filter conditions, and evaluating liquid level meters.

These devices work on the principle that the measured pressure difference correlates with the flow rate. In flow measurement, a constriction in a pipe causes a pressure drop across it, allowing the differential pressure transmitter to calculate the flow rate accurately. Their ability to precisely assess pressure variations makes them invaluable in controlling processes and ensuring optimal system efficiency.

Absolute Pressure Transmitters

Absolute Pressure Transmitters gauge pressure relative to a perfect vacuum. They’re employed in scenarios where referencing pressure to an absolute vacuum is necessary. For instance, in high-altitude aircraft, vacuum systems, and certain industrial applications where precise absolute pressure readings are vital.

These transmitters typically measure pressure in pounds per square inch absolute (psi) or pascals (Pa), incorporating a perfect vacuum as the reference point.

Gauge Pressure Transmitters

Gauge Pressure Transmitters measure pressure concerning atmospheric pressure as a reference point. Commonly used in industrial processes, HVAC systems, and pneumatic systems, these transmitters aid in maintaining optimal pressure levels for efficient operations.

These devices generally express pressure readings in pounds per square inch gauge (psig) or in kilopascals (kPa). Their adaptability and widespread use across industries highlight their significance in ensuring systems operate within specified pressure ranges.

Sealed Pressure Transmitters

Sealed Pressure Transmitters are designed to safeguard internal components from direct contact with the process media. This protection ensures the accuracy and reliability of pressure readings in harsh or corrosive environments.

The sealed design prevents contaminants or corrosive substances from affecting the sensor, allowing these transmitters to provide consistent and accurate data without compromising durability.

Wireless Pressure Transmitters

Wireless Pressure Transmitters represent a contemporary advancement, eliminating the need for physical wiring. These transmitters transmit data wirelessly to receivers or control systems, offering flexibility in installation and ease of maintenance.

Their wireless functionality facilitates installation in locations that are difficult to reach with wired systems. This flexibility makes them an attractive choice in scenarios where traditional wired connections pose challenges.

Factors Influencing Pressure Transmitter Selection

  • Environmental Considerations: Temperature, Pressure, and Medium
    • Impact of operating temperature range on the transmitter’s performance
    • Suitability of the device to withstand varying pressures and extreme conditions
    • Compatibility with different types of media, especially corrosive or abrasive substances


  • Accuracy and Precision Requirements
    • Assessment of the required level of precision and accuracy in pressure measurements
    • Industry-specific demands for high precision (e.g., aerospace, pharmaceuticals)
    • Flexibility regarding acceptable levels of accuracy in certain applications


  • Communication Protocols and Connectivity
    • Compatibility with various communication protocols like HART, Modbus, or Profibus
    • Seamless integration with existing control systems or networks
    • Efficient data transmission capabilities to enhance operational efficiency


  • Maintenance and Longevity
    • Consideration of maintenance requirements for the pressure transmitter
    • Long-term reliability and robustness for extended operational lifespan
    • Features facilitating easy maintenance and diagnostics, reducing downtime

Applications of Pressure Transmitters

Pressure transmitters find extensive utilization across diverse industries due to their ability to accurately measure and monitor pressure variations. Let’s explore some key sectors where these devices play critical roles:

Industrial Process Control and Automation

In industrial settings, pressure transmitters are integral to process control and automation. They monitor pressure changes in pipelines, tanks, and machinery, ensuring optimal operating conditions. Industries such as manufacturing, chemical processing, and food and beverage heavily rely on these devices to maintain operational efficiency and safety.

HVAC (Heating, Ventilation, and Air Conditioning) Systems

Efficient operation of HVAC systems depends on maintaining precise pressure levels. Pressure transmitters help regulate airflow, monitor refrigerant pressures, and ensure optimal system performance. They contribute to energy efficiency and comfortable environmental conditions in residential, commercial, and industrial spaces.

Oil and Gas Industry Applications

The oil and gas industry extensively utilizes pressure transmitters to monitor pipelines, measure wellhead pressures, and ensure safe extraction and transportation of oil and gas. These devices help maintain operational safety and prevent hazardous incidents by continuously monitoring pressure changes.

Biomedical and Pharmaceutical Usage

In the biomedical and pharmaceutical sectors, pressure transmitters play a crucial role in various applications. From monitoring blood pressure in medical devices to ensuring precise pressure in pharmaceutical manufacturing processes, these instruments guarantee accuracy and safety in critical healthcare and production environments.

Aerospace and Aviation Sector

In aerospace and aviation, where precision and reliability are paramount, pressure transmitters are fundamental. They aid in monitoring cabin pressure, ensuring accurate fuel measurements, and assisting in altitude control systems. These devices contribute significantly to the safety and efficiency of air travel.

flow meter

Precision Manufacturing: CNC Machining for Pressure Transmitters

CNC (Computer Numerical Control) machining stands as a cornerstone in the production of pressure sensors, ensuring precise and consistent manufacturing processes.CNC machining plays a pivotal role in crafting components of flow meters with unparalleled accuracy.


  1. Mechanical Housing: The outer casing of a pressure transmitter is often made of metal or plastic, and machining is used to shape and size the housing to ensure proper sealing and durability. For instance, CNC (Computer Numerical Control) milling can be employed to cut and carve metal or plastic materials for the housing.
  2. Sensor Components: The pressure sensor is a crucial part of a pressure transmitter. Sensor components typically include the sensor chip and sensor housing. Manufacturing these components requires precision machining, such as micro-machining and precision machining using CNC processes, to ensure sensor sensitivity and accuracy.
  3. Electronic Component Mounting: Inside the liquid level meter, numerous electronic components may need brackets or mounting seats for installation. These brackets can often be manufactured through machining methods, such as cutting metal brackets using CNC milling.
  4. Seals: Pressure transmitters operate in various environments, necessitating seals to protect their internals from external influences. These seals can be manufactured through machining, for example, using CNC turning to cut rubber or plastic seals.


In conclusion, pressure transmitters play a pivotal role across industries due to their precise measurement capabilities. Through CNC machining, various components are crafted with accuracy, ensuring their functionality and reliability. As technology advances, the manufacturing process continues to evolve, enhancing the efficiency and performance of these crucial devices in diverse applications.

Get Quality CNC Machining Services in China

As a pressure transmitter parts manufacturer, our skilled team boasts 17+ years of expertise, ensuring precision and quality at competitive prices. Count on our advanced machinery and unwavering commitment to craft pressure transmitter parts to your specifications. Reach out today and let us fulfill all your CNC machining requirements excellently.


1. What are the typical industries that extensively use pressure transmitters?

Pressure transmitters are widely employed in industries such as oil and gas, manufacturing, aerospace, pharmaceuticals, HVAC, and many more.


2. How do pressure transmitters differ from pressure sensors?

While both measure pressure, pressure transmitters not only detect pressure but also convert it into electrical signals for transmission and analysis. Pressure sensors primarily sense pressure without further signal conversion.


3. What factors should be considered when selecting a pressure transmitter?

Key factors include environmental conditions, accuracy requirements, communication protocols, maintenance needs, and the specific application’s demands for pressure measurement.


4. Can pressure transmitters withstand extreme temperatures and harsh environments?

Depending on their design and specifications, certain pressure transmitters are built to withstand extreme temperatures, corrosive substances, and harsh environments. It’s essential to choose models suitable for the intended operating conditions.

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