Differential Pressure Transmitter

$ 1,132.75$ 1,650.25


Differential Pressure Transmitter


A differential pressure transmitter is an essential device used in industrial processes to measure and monitor the difference in pressure between two points in a system.  It plays a crucial role in ensuring the accurate measurement and control of various fluids and gases.

At its core, a differential pressure transmitter consists of three main components: a sensor, a transmitter, and a display unit.  Let’s take a closer look at each of these components and how they work together to provide accurate pressure measurement.



The sensor is the heart of the differential pressure transmitter.  It detects the pressure difference between the two points in a system using various sensing elements, such as a diaphragm, a bourdon tube, or a capacitive or piezoelectric mechanism.  When the pressure difference changes, the sensor generates an electrical signal proportional to the differential pressure.


The electrical signal generated by the sensor is then fed into the transmitter, which converts it into a standardized output signal, typically a milliampere (mA) signal (e.g., 4-20 mA) or a digital signal (e.g., HART or Modbus).  This standardized signal allows for easy transmission and integration with other process control systems.

Display unit

The display unit is responsible for visualizing the pressure measurement data provided by the transmitter.  It can range from a simple analog gauge or a digital readout to a more advanced graphical user interface (GUI), enabling easy configuration and calibration of the transmitter, along with displaying additional diagnostic information.

In addition to these core components, modern differential pressure transmitters often incorporate intelligent features and advanced technologies to enhance their functionality and ease of use.  Some notable features include:

Additional Components

Digital communication protocols

Differential pressure transmitters equipped with digital communication options, such as HART (Highway Addressable Remote Transducer) or Modbus, allow for remote configuration, calibration, and diagnostics.  This simplifies maintenance and troubleshooting activities.

Smart diagnostic capabilities

Advanced differential pressure transmitters employ smart algorithms and self-diagnostic features.  They can detect issues such as sensor drift, clogging, or overpressure, and provide valuable alerts or data to ensure the reliability of the measurement.

Temperature compensation

To ensure accurate measurements in varying environmental conditions, differential pressure transmitters often incorporate temperature compensation capabilities.  These compensations eliminate the effects of temperature on the sensing element, resulting in more precise measurements.

Safety features

In high-risk industrial applications, safety is paramount.  Some differential pressure transmitters offer features such as redundant sensor technology, SIL (Safety Integrity Level) ratings, or explosion-proof enclosures to ensure reliable and safe operation.

Remote monitoring and control

With the advent of the Industrial Internet of Things (IIoT), modern differential pressure transmitters can connect to supervisory control and data acquisition (SCADA) systems or cloud platforms. This enables real-time monitoring, data logging, and remote configuration across multiple devices, improving efficiency and decision-making.

In conclusion, a differential pressure transmitter is a vital instrument used in industrial processes to accurately measure and monitor pressure differentials. Its sensor detects the pressure difference, the transmitter converts it into a standardized output signal, and the display unit visualizes the measurement data. With advanced features like digital communication, smart diagnostics, temperature compensation, and remote monitoring, these transmitters play a critical role in optimizing process control, maintaining safety, and enhancing overall operational efficiency.


There are several types of differential pressure transmitters available, each designed to meet specific application requirements.  Here are some commonly used types:

Wet/Wet Differential Pressure Transmitters

These transmitters are suitable for applications where both the high-pressure and low-pressure sides come into contact with the process media.  They typically feature isolated pressure sensors that can handle corrosive or aggressive fluids.  Wet/wet transmitters are commonly used in industries such as chemical processing, oil and gas, and water treatment.

Wet/Dry Differential Pressure Transmitters

In these transmitters, one side of the pressure sensor is in contact with the process media, while the other side remains isolated from it. This configuration is useful when dealing with fluids that could damage the sensitive electronics of the transmitter. Wet/dry transmitters find application in industries such as HVAC, pharmaceuticals, and food and beverage.

Digital Differential Pressure Transmitters

Digital differential pressure transmitters use digital communication protocols to transmit pressure data to a control system or a computer.  Also, the most common digital protocols used are HART (Highway Addressable Remote Transducer) and Modbus.  Moreover, these transmitters provide greater flexibility in terms of configuration, calibration, and diagnostics, allowing for remote monitoring and integration with other systems.

Diaphragm/Bellows Differential Pressure Transmitters

Diaphragm or bellows-based differential pressure transmitters utilize a flexible membrane (diaphragm or bellows) as the sensing element. These transmitters provide excellent accuracy and sensitivity and are suitable for applications where precise measurements are required, such as in laboratories or research facilities.

Capacitive Differential Pressure Transmitters

Capacitive differential pressure transmitters use a capacitive sensor to measure the pressure difference. These transmitters typically have a diaphragm with gaps on either side and as the pressure changes, the diaphragm’s deflection alters the capacitance, which is then translated into a measurement signal. Capacitive transmitters offer high accuracy, and low power consumption, and are suitable for applications where energy efficiency is a priority.

Piezoelectric Differential Pressure Transmitters

Piezoelectric differential pressure transmitters employ piezoelectric materials that generate an electrical charge when subjected to pressure. These transmitters are known for their fast response time, high sensitivity, and resistance to harsh environments. Also, they are commonly used in applications such as airflow monitoring, leak testing, and aerospace industries.

It’s worth noting that these are just a few examples of differential pressure transmitters, and there may be other variations or specialized types available based on specific industry needs. In addition, when selecting a differential pressure transmitter, it’s essential to consider factors such as the fluid being measured, environmental conditions, accuracy requirements, communication capabilities, and safety considerations specific to the application.



Differential pressure transmitters are known for their high accuracy in measuring pressure differences, ensuring precise and reliable measurements.

Wide Range of Applications

These transmitters can be used in a variety of industries and applications, including HVAC systems, process control, HVAC, water management, and more.


Depending on the specific requirements, there are various types of differential pressure transmitters available, offering flexibility in terms of pressure range, compatibility with different fluids, and environmental conditions.


Well-designed and properly maintained differential pressure transmitters can have a long lifespan, making them a cost-effective option over time.

Compatibility with Control Systems

Differential pressure transmitters often have standardized output signals (such as 4-20 mA), making them compatible with a wide range of control systems and allowing for easy integration.

Remote Monitoring and Control

Advanced differential pressure transmitters equipped with digital communication protocols (such as HART or Modbus) enable remote monitoring, configuration, and diagnostics, improving efficiency and reducing the need for manual intervention.


Installation Complexity

Installing a differential pressure transmitter can be more complex compared to other pressure measurement methods, as it requires proper positioning and connection to the system under measurement.


Differential pressure transmitters can be more expensive relative to other pressure measurement devices, particularly when additional features and advanced technologies are involved.

Calibration and Maintenance Requirements

Periodic calibration and maintenance are crucial for accurate measurements. Also, this involves additional time, effort, and potentially additional costs.

Sensitivity to Vibrations

Differential pressure transmitters can be sensitive to vibrations, which can affect measurement accuracy. Finally, proper mounting and isolation mechanisms need to be employed to mitigate these effects.

Potential for Clogging

In certain applications where particulate matter or contaminants are present in the media being measured, there is a possibility of clogging or fouling of the pressure-sensing element, which could affect reliability and require periodic maintenance.

Environmental Limitations

Some differential pressure transmitters may have limitations in terms of pressure, temperature, or compatibility with specific fluids they can handle. It is important to select a transmitter that meets the environmental conditions of the application.

Overall, the advantages of differential pressure transmitters, such as accuracy, versatility, and compatibility, outweigh the disadvantages for many industrial applications. However, it is essential to carefully consider the specific requirements and potential challenges of the application before selecting and installing a differential pressure transmitter.


Differential pressure transmitters find applications across a wide range of industries due to their ability to measure and monitor pressure differences accurately. Some of the industries that commonly use these transmitters include:

Oil and Gas

Differential pressure transmitters are extensively used in the oil and gas industry for applications such as flow measurement, level control, and pressure monitoring in pipelines, refineries, offshore platforms, and wellheads.

Chemical and Petrochemical

These industries utilize differential pressure transmitters in processes involving fluid and gas measurement, pressure control, and filtration systems. Finally, they are crucial for ensuring accurate measurements and maintaining safe operating conditions.

HVAC (Heating, Ventilation, and Air Conditioning)

Differential pressure transmitters play a vital role in HVAC systems by monitoring air pressure, flow, and filter conditions. Moreover, they help maintain optimal air quality, control airflow, and ensure the efficient operation of HVAC equipment.

Water and Wastewater Management

Differential pressure transmitters are used in water treatment plants, pumping stations, and wastewater management systems to measure pipe pressure, monitor filter performance, and control flow rates. Also, they aid in maintaining efficient and reliable water management processes.

Pharmaceuticals and Biotechnology

In pharmaceutical and biotech industries, differential pressure transmitters are employed for precise monitoring and control of pressure in various processes, such as filtration, fermentation, and sterilization. Additionally, they help ensure product quality, safety, and regulatory compliance.

Power Generation

Differential pressure transmitters are utilized in power plants, both traditional and renewable, for applications like steam and gas flow measurement, boiler and turbine control, and monitoring of pressure differentials in cooling systems.

Food and Beverage

These industries rely on differential pressure transmitters for applications such as monitoring and controlling pressure in pipelines, measuring flow rates, and ensuring the integrity of filtration systems. They are crucial for maintaining food safety standards and quality control.

Aerospace and Defense

Differential pressure transmitters find application in aerospace and defense industries for tasks like aircraft fuel systems monitoring, hydraulic systems control, and cabin pressurization.  Additionally, they play a vital role in ensuring the safe and efficient operation of aircraft and defense equipment.

Manufacturing and Process Automation

Differential pressure transmitters are used in various manufacturing and process automation industries to measure pressure differences in pneumatic systems, control valves, and monitor fluid levels. They aid in optimizing production processes and maintaining consistency in quality.

Research and Development

Differential pressure transmitters are utilized in research laboratories and development facilities for precise pressure monitoring.  It occurs in experiments, testing, and calibration processes.

These are just a few examples, and differential pressure transmitters have applications across numerous other industries.  Industries where pressure measurement and control are critical for safe and efficient operations.


In addition, Diaphgram options allow for one to measure the Delta pressure between two sides.  Like a filter bank, vertical pressure leaf filter, or packed distillation columns

The Differential pressure transmitter provides superior measurement capability that can be used for almost any line pressure or tank level applications.  Additionally, the pressure transmitter is available in either gauge or absolute pressure in pressure ranges to 4,000 psi (275 bar).

Differential Pressure Transmitter Materials of Construction 

It utilizes a solid-state, polysilicon pressure sensor with a choice of either 316L or Hastelloy C-276 isolating diaphragms. The low oil fill of this design has very little temperature effect and outstanding accuracy.

Furthermore, the pressure transmitter is suitable for almost any location in which value is a priority.  Also, Its patented piezoresistive silicon sensor, dual-compartment housing, and compact.  It is lightweight design adds up to a reliable, convenient, and economical installation wherever it is applied. In conclusion, it is designed with reliability, long-term performance, and maintainability in mind.

The pressure transmitter is available with a wide range of options to provide solutions for virtually any application.

If this does not fit your required application, pls see our other transmitters

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Additional information

Weight 3 lbs
Dimensions 12 × 12 × 12 in
Connection end

Flanged, Threaded, Sanitary

Remote Diaphragm

2", 3"


2", 3"



Differential Pressure Transmitter Specifications

Ranges0.25 mbar - 7.5 mbar
1.2 mbar - 62.3 mbar
6.2 mbar - .62 bar
24.9 mbar - 2.49 bar
.20 bar - 20.6 bar
Diaphragm Material316L SST, Alloy C-276, Alloy 400
Temperature LimitsAmbient: -40 to 185 F
Storage: -50 to 230 F
Communication OptionsModbus RTU, HART
Output Options4-20MA, 0-10vdc






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