A Review of Differential Pressure Transmitters

While there are different designs and options in differential pressure transmitters, they are all designed to accomplish the same type of measurement. These devices are used to measure the pressure from two different points in a system and compared the two.

However, unlike two different measurements providing the exact pressure on either side, the transmitter only records the difference, providing one easy to read and track number. The pressure reading with the transmitter is also designed to read within a specifically calibrated range. This is similar to other types of pressure transmitters, particularly those that are designed to read even very small pressure changes.

Types to Consider

Virtually all of the differential pressure transmitters sold today are designed for a specific type of use or a specific use environment. This provides added protection to the devices and ensures that they remain operational even in corrosive environments, with high temperature use and even with high pressure types of measurement requirements.

Virtually all of the differential pressure transmitters will be electronic, providing accurate readings while still being very low cost. These are designed to be easy to install and fully compatible with standard systems. Additionally, with electronic transmitters, the wiring is simple to complete even when the transmitter may need to be located in a small space or an area that is challenging to access.

The most often used types of DP transmitters include:

 * Strain gauge
 * Force-balance
 * Mechanical resonance, sometimes called a vibrating wire transmitter
 * Differential capacitance

All are designed with two ports connecting directly to the medium being measured. One port will be called the H or high port and the other is named the L or low port. These labels do not correspond to the pressure of the medium being measured; rather it is related to how the specific pressure on that particular port will correspond to the electronic signal sent from the transmitter to provide the reading.

For example, when the pressure on the L side is greater than the pressure reading on the H side, the transmitter will record a decrease in the output signal. The opposite is true if the reading on the H side is higher than the L side, the output signal will increase.

Ideally, purchasing all of your DP transmitters, sensors and transducers from a specialized company is always the best option. This provides you with not only a top range of product solutions but also the professional expertise to help you to get the right transmitter for any application.

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