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The World Market for Pressure Transmitters, 2nd Edition (October 2007) - Current edition

The World Market for Pressure Transmitters, 1st Edition (2004 - Provides historical perspective)

The World Market for Differential Pressure (DP) Flowmeters and Primary Elements (January 2007)

Differential Pressure Articles  Links to DP Transmitter Suppliers

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What is Pressure?

Pressure is a state or condition we face everyday.  We speak of being “under pressure”, and talking about putting pressure on another person or situation.  Fundamentally, the idea of pressure is the idea of the continuous exertion of force.  From a measurement perspective, pressure is force per unit area.  The idea of atmospheric pressure also plays an important role in pressure measurement by pressure transmitters. In process control, pressure measurement occurs in a variety of contexts, especially including the measurement of the pressure exerted by liquid, steam, and gas.

Pressure Transmitters 

Flow Research has completed a new 2nd. Edition study of the pressure transmitter market.  Pressure transmitters assume the existence of pressure, and transmit this pressure in quantitative form to an instrument, device, or controller that is capable of acting on this value.  Pressure transmitters include the following elements:

a)      Pressure sensor

b)      Transducer, amplifier, or conditional element

c)      Output variable

It is important for this study to distinguish between pressure transducers and pressure transmitters.  Pressure transducers are generally lower in cost and smaller than pressure transmitters, and are typically not used in the process industries.  They typically have loose wires at one end, and do not perform at the same level as pressure transmitters. 

Four Types of Pressure Transmitters

Pressure transmitters measure the pressure exerted by liquid, steam, and gas. There are four kinds of pressure transmitters:

• Multivariable (MV) pressure transmitters that measure two or more process variables in a single device.  These are usually pressure and temperature.
• Differential pressure (DP) transmitters measure a difference in pressure upstream and downstream of a constriction in the pipe, called a primary element. 
• Gage pressure transmitters measure an amount of pressure that includes atmospheric pressure. 
• Absolute pressure transmitters measure an amount of pressure that does not include atmospheric pressure. 

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