Differential Pressure Transmitters

Our differential pressure transmitters feature Yokogawa DPharp technology to deliver accurate, repeatable, and fast-responding differential pressure measurements. Traditional mount or remote diaphragm seal mount configurations are available.

How Does a Differential Pressure Transmitter Work?

Differential Pressure (DP) transmitters measure the difference between two pressures. They use a reference point called the low-side pressure and compare it to the high-side pressure. Ports in the instrument are marked high-side and low-side. The DP reading can be either negative or positive depending on whether the low-side or high-side is the larger value. A DP transmitter can be used as a gauge pressure transmitter if the low-side is left open to the atmosphere.

Common Industrial Applications

  • Closed Tank Level
  • DP Flow (Secondary Element)
  • Filter health
  • Density

What are the Different Types of Pressure Measurement?

View the comparison chart.


Which DP Level Transmitter Series Is Right for You?

  EJX-A Series EJX-A Series
EJA-E Series EJX-A Series
± 0.025%  
± 0.040%
± 0.055%  
± 0.1% of URL per 15 years  
± 0.1% of URL per 10 years  
Response Time
90 msec
FMEDA Report
IEC 61508 Certified (SIL 2)
Differential Pressure
Static Pressure



The Semiconductor industry uses ultrapure water to rinse away contaminants from the silicon wafers after each layer of the fabrication process. To ensure effective rinsing after each step could require thousands of gallons of water. If the water has even the slightest impurities, the semiconductors can potentially be contaminated, leading to scrap waste and loss of weeks of production. Many industries use reverse osmosis (RO) technology in the water purification process. The importance of pure water can include public safety, product quality, and reliability of production equipment. An RO system functions by creating a differential pressure across an array of filters. Pressure is applied to the feed water side of the system to force water through a semi-permeable membrane. The membrane blocks contaminants to allow permeate water to pass through.


Download this eBook and learn:

  • The basic physics of pressure
  • Different types of pressure sensors
  • Features of pressure transmitters
  • Pressure transmitters communications standards
  • Key characteristics of pressure
  • Common types of diaphragm seals

Podcast: The benefits of a tried-and-true pressure-based level measurement technology.

Edition 01

Overcome Temperature Challenges. Correct common conditions for better level measurement.

Pressure - Low Cut Output Signal With some applications, the output signal can be erratic as the input nears the zero point. One of the most common applications with this issue is differential pressure flow measurement. A differential pressure (DP) ...
Edition 1
High/Low Swap Sometimes during the rush of installing hundreds of devices, the impulse lines of a DP pressure transmitter can be plumbed to the incorrect ports on the transmitter. This error can go unnoticed even during the proof test stage...
Edition 2
It is a function on differential pressure (DP) transmitters that calculates the process flow using differential pressure readings. It is used on DP applications for flow measurement.
Edition 1

It is a function on differential pressure (DP) transmitters that calculates the process flow using differential pressure readings. It is used on DP applications for flow measurement.


Get the most from what exists currently and take advantage of new methods. Appeared in the March 2021 issue of InTech Focus, an ISA.org publication.


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