Absolute and Gauge Pressure Transmitters - Overview and Working Principle

For many years, pressure transmitters have been used to measure liquid levels in open or pressurized tanks in industrial processes.With rapid digitization, these transmitters now contain advanced technology and improved additional features.This advancement guarantees high performance in measurement, process optimization and operational safety.Initially, pressure transmitters were equipped with capacitive and piezoresistive technology.Today, they feature microprocessor-based technology and are therefore called smart pressure transmitters.There are many types of pressure transmitters in use today.Absolute pressure transmitters and gauge pressure transmitters are two popular choices discusses both types of pressure transmitters in detail. So, stay tuned.

How Absolute Pressure Transmitters Work and Other Details

Often referred to as absolute pressure sensors, they provide pressure measurements with a zero pressure reference, which is as close to vacuum as possible.They use 0°K as a reference point. Therefore, there is no comparison in terms of pressure change.As mentioned earlier, pressure is measured relative to a perfect vacuum using an absolute pressure sensor.This means that the measurement is not affected by atmospheric pressure such as changes in air or altitude pressure.Since they do not communicate with external systems, there are no publishing nodes in the system. The side of the absolute pressure transmitter that is not exposed to the pressure medium is completely sealed. Absolute pressure transmitters are used in applications that require monitoring the performance of industrial driven vacuum pumps. For example, in the food industry, vacuum packaging is used to prevent oxygen from degrading perishable foods, thereby extending the flavor and shelf life of the product.

What is a gauge pressure transmitter and how does it work? 

For most applications, the generated vacuum or precise pressure is not an important criterion.Instead, you just need to understand the difference between vacuum and atmospheric pressure.This is where a gauge pressure transmitter is used.Commonly called gauge pressure sensors, they measure pressure relative to the local atmospheric pressure.These sensors have ports that sample ambient pressure in real time.A tube connects to the port and a vent opens to atmosphere.The pipes are connected to the system where the actual measurements are to be made.Gauge pressure can be measured using a variety of techniques.Many of them use thin films that hold electrical components such as resistors, whose value changes when bent.Today, microelectromechanical systems, commonly referred to as MEMS, are used.In this case, tiny, lightweight structures are held in silicon that can vibrate or bend.Since the substrate is silicon, electronic circuits can be integrated with MEMS systems.Small electrical paths ensure low noise and high measurement accuracy, while MEMS system components make the sensor completely immune to temperature changes.If you are looking for absolute and gauge pressure transmitters for your industrial application, make sure you engage a reliable industry-leading supplier.The Transmitter Shop (TTS) is an industry leader specializing in precision engineered and performance driven pressure transducers from top brands such as Emerson.

3 Main Pressure Transmitter Technologies That Make Devices Popular

A pressure transmitter, also commonly referred to as a pressure sensor, is a device used to convert pressure into an electrical signal.This signal can then be used to drive other circuits.These transmitters have come a long way in development and technological advancement over the years.There are many types of pressure transmitters in use today, each with its own set of properties and capabilities.These process control devices have been dominating the market for the past few years due to emerging trends in pressure transmitter technology and are expected to continue to do so in the coming years.  

What are the different key technologies for pressure transmitters?

• Pressure transmitters have been used in a variety of applications over the years. However, the following 3 technological trends in these devices are the main reasons for their increasing popularity.

• Wireless Pressure Transmitters – This is one of the major trends in pressure transmitter technology.As the name suggests, wireless pressure transmitters do not  use wires.This allows people to install them in hard-to-reach locations.These transmitters are less expensive to install than other transmitters due to the elimination of wiring costs.

These transmitters can be used in a wide range of applications including:

• Pump monitoring

• Water tank level monitoring

• Wastewater monitoring

• Hydraulic system monitoring

•  Leak detection

• Multivariable Pressure Transmitters – As the name suggests, multivariable transmitters are capable of measuring multiple process variables.You can use these devices to measure variables such as temperature, pressure, mass, volume,and energy flow, as well as differential pressure.Thus, you can replace three single variable transmitters with one multivariable transmitter.These devices are known to enhance process insight and accuracy, leading to improved performance.

  They are most commonly used in the following applications:

• Liquid measurement

• Measurement of natural gas and natural gas

• Saturated and superheated steam measurement

•  Integrated Pressure Transmitters – This is another trend driving the growth of the pressure transmitters market.In this type of transmitter, the flow element is integrated with the multivariable pressure transmitter.This facilitates a complete multivariable flow meter.In these transmitters, the primary element is mounted on them.The flowmeters for these sensors are calibrated with primary elements.What makes it special is that the user does not need to purchase primary flow elements (flow nozzles or orifice plates) and differential pressure transmitters from two different suppliers.

• All the three trends explained above are the main reasons for the growth of the pressure transmitter market. Furthermore, the above transmitters are able to provide precise and optimum performance.So, if you are looking for a pressure transmitter for your industrial application, please consider from the above. You can also discuss it with an expert before choosing a transducer. Also, sourcing these devices from a reputable and trustworthy manufacturer can go a long way in determining the performance of your transmitter.The Transmitter Shop is one of the leading and experienced Manufacturers and Suppliers of Industrial Grade Pressure Transmitters in the USA.