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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?

Also known as a manometer or a pressure gauge, this gadget detects the level of stress within a system and changes it into corresponding electrical signals. These flow meters ensure that there is accuracy in transmitting information about pressures hence making it possible to have safe system operating conditions. Consequently, for the purpose of analysis, monitoring, as well as control in different industrial fields.

Pressure transmitter parts

Pressure transmitters usually consist of the following parts:

  • Pressure sensor: This is mainly used piezoresistive or capacitive or piezoelectric sensors which form the core part of pressure transducer.
  • Electronic circuit board: It has signal processing circuits that process sensor output signals.
  • 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.

Typically, most CNC machined elements in pressure transmitters like pressure sensors, process connections, and housings go through such CNC machining processes as:

  • Turning: It is a common CNC machining method ideal for making shaft-like components or shells. Thus, for instance, CNC lathes can be used to machine housings and process connection pieces and obtain exact sizes and shapes.

  • Milling: Milling is another typical CNC machining method which is convenient when it comes to machining complex shapes as well as details. On the other hand, it is possible that some sections such as the PCB require fine machining with a CNC mill in order to meet their specifications.


  • Drilling and Tapping: Here, threaded connections and mounting holes are machined using drilling machines or tapping equipment. These procedures are highly essential for process connections and electrically connected constituents.


  • Grinding: Grinding may be employed for getting extremely high surface finish together with dimensional accuracy perhaps meant for the processing of sensitive elements in a sensor or sealing surface in housing.


These several CNC machining processes give high precision level coupled with repeatable fabrication abilities so important in making key component parts of precision instruments like 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 Transmitter plays a vital role in the measurement of difference between two pressures. These usually consist of two input ports where the pressure difference is sensed and calculated. They are widely used for flow measurement, monitoring filter conditions and confirming liquid level meters among others.

These devices operate on the principle that the measured pressure drop is related to flow rate. A constriction in a pipe in flow measurement causes a pressure decrease through it leading to an accurate calculation of flow rate by differential pressure transmitter. They are essential for process control and ensuring optimal system efficiency because they can accurately determine changes in pressure.

Absolute Pressure Transmitters

These measure gauge pressurereferring to a perfect vacuum. They are used when reference to absolute vacuum is needed, such as high altitude aircrafts, vacuum systems, and some industrial applications where actual absolute measurements ofpressure are required.

Most often these sensors measure pounds per square inch absolute (psi) or pascals (Pa) with respect to a perfect vacuum as the reference point.

Gauge Pressure Transmitters

Pressure gauges measure pressure in relation to atmospheric pressure. Commonly used for industrial processes, HVAC systems, and pneumatic systems, these transmitters help ensure an optimum pressure level for efficient operation.

Typically, these devices show the pressure readings as pounds per square inch gauge (psig) or kilopascals (kPa). This versatility and common use across industries emphasize their importance in making sure systems work within specific pressure ranges.

Sealed Pressure Transmitters

Sealed Pressure Transmitters protect internal elements from coming into contact with the process media. When operating in harsh and corrosive environments, this protection guarantees precise and dependable pressure measurements.

Because of the sealed design, it is impossible for contaminants or corrosive substances to damage the sensor; hence providing consistent and accurate information during its entire life span while ensuring reliability.

Wireless Pressure Transmitters

Wireless Pressure Transmitters are among the new age technology advancements which obviate need for physical wiring. These devices transmit measurement data wirelessly to receivers or control systems by facilitating installation flexibility and maintenance simplicity.

With wireless capabilities, they can be installed at difficult-to-reach places where wired ones cannot go. This gives them an edge especially in circumstances where traditional hard-wired connections would present problems.

Factors Influencing Pressure Transmitter Selection

  • Environmental Considerations: Temperature, Pressure, and Medium
    • Transmitter performance and operating temperature range
    • Ability of device to withstand different pressures and extreme conditions.
    • It should be compatible with various media types especially those that are corrosive or abrasive.


  • Accuracy and Precision Requirements
    • The level of precision and accuracy needed when measuring pressure must be determined
    • There are certain industries that require high precision like aerospace industry, pharmaceuticals among others.
    • In some applications there is flexibility in terms of what is acceptable for accuracy levels.


  • Communication Protocols and Connectivity
    • Compatibility with a variety of protocols such as HART, Modbus or Profibus etc.
    • Smooth integration with existing control/monitoring systems or networks.
    • Effective data transmission speeds for better process efficiency.


  • Maintenance and Longevity
    • Maintenance requirements applicable for the pressure transmitter considerations
    • Long term reliability and ruggedness for extended operational life span.
    • Attributes aiding in easy maintenance/diagnostics to minimize downtime.

Applications of Pressure Transmitters

Besides, pressure transducers have varied applications across industries due to their ability to measure changes in atmospheric pressure with utmost accuracy. Below are a few sectors where such devices are highly indispensable:

Industrial Process Control and Automation

In the industrial settings, pressure transmitters form an integral part of process control and automation. Their functions involve monitoring fluctuation in pressure within pipes, tanks and machines for smooth operations. These tools keep the manufacturing sector as well as chemical processing plants and food and beverage outlets running smoothly.


HVAC (Heating, Ventilation, and Air Conditioning) Systems

For HVAC systems to work optimally, maintaining precise airflow is critical. Pressure transmitters help regulate air flow, check refrigerant pressures as well as optimize system performance. Residential homes, commercial buildings and factories are some of the areas where they contribute towards energy conservation efforts.


Oil and Gas Industry Applications

At the biomedical arena also known as health industry, a presure transmitter plays diverse roles. From quantifying blood force on medical machinery or regulating proper compression levels during pharmaceutical production runs thus guaranteeing precision at critical health care facilities or even manufacturing firms.


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

When it comes to aerospace methodologies or aviation engineering as an example one can’t over emphasize on what everyone knows about those machines including our topic today i.e., pressure transducers because they’re fundamental here; without them there would not be any reliable piece of intelligence than its hypothetically impossible existence unless someone imagines another planet which doesn’t exist but since we’re told by scientists that nothing like that exists in our solar system then maybe there’s more to this than meets his eyes. These are used to monitor the pressure in the cabin, for fuel measurements, and altitude control systems. They are vital for a safe journey and effective air travel.

flow meter

Precision Manufacturing: CNC Machining for Pressure Transmitters

CNC (Computer Numerical Control) machining is a vital constituent in pressure sensors manufacturing that guarantees accuracy and consistency in the manufacturing process.CNC machining plays a significant role in making flow meter components with unmatched precision.

1.Mechanical Housing: The exterior casing of a pressure transmitter is often of metal or plastic and the machining helps to shape and size the housing for proper sealing and durability. In fact, it can rely on CNC (Computer Numerical Control) milling to cut and mill out the metallic or polymers used for the housing.

2.Sensor Components: A pressure sensor is an important part of a pressure transmitter. Sensor parts though comprise of sensor chip and sensor enclosure. Accuracy machining including micro-machining, CNC, micro-machining, precision machining should be used when manufacturing these components so as to ensure that the sensitivity as well as accuracy of sensors are maintained.

3.Electronic Component Mounting: Inside a liquid level gauge numerous electronic components may need brackets or mounting seats for installation. These brackets can sometimes be made from machines such as cutting metal brackets using CNC milling.

4.Seals: Pressure transmitters operate under different conditions thus requiring seals which protect them from outside influences. This kind of seals can be machined e.g. CNC turning is used to cut rubber or plastic seals.


To sum up, pressure transmitters are essential in many different industries for their accurate measurement ability. They carefully manufacture various components through CNC machining to ensure they work properly and can be relied upon. It is of utmost importance that these devices in many applications remain efficient and effective as manufacturing processes evolve with advancing technology.

Get Quality CNC Machining Services in China

Being a sought-after manufacturer of pressure transmitter parts, working with us means having access to 17+ years of experience which guarantees precision and quality at affordable rates. You can trust our state-of-the-art machines and unrelenting dedication to making sure your pressure transmitter parts are made exactly the way you want them to be. Reach out today and let us meet all your CNC machining needs perfectly.


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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