Key Questions to Ask When Ordering Industrial Pressure Measurement Devices

Selecting the appropriate industrial pressure transmitter poses a significant challenge. When determining the ideal transmitter for your specific application, it’s crucial to ask the right questions during the decision-making process.

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Question 1: What is the type of measurement?

• Pressure measurement – The pressure transmitter’s most prevalent usage involves measuring both pressure and vacuum. In this application, the sensor experiences pressure, typically from sources like pumps or compressors
• Level Measurement – The sensor gauges the variance in elevation between two locations. It can be employed for determining the height of a liquid column
• Flow measurement – Differential pressure flow measurement relies on the pressure contrast within a moving fluid, facilitated by specialized primary components. These flow meters are instrumental in quantifying the flow of both liquids and gases within pipelines
• Density measurement – Utilizing a differential pressure transmitter for density measurement proves to be an efficient approach for assessing the density of liquids

Question 2: What is the nature of the fluid?
Considering the composition of the fluid, whether it’s gas, liquid, or vapor, holds significant importance in process measurement. Understanding the essential characteristics of the fluid is crucial for selecting the appropriate sensor for your industrial process.

Question 3: What type of pressure is being measured?
The pressure type you intend to measure—Differential, Gauge, Absolute, or Vacuum—is a crucial factor in selecting the appropriate pressure transmitter.

• Pressure transmitters designed for measuring pressure differentials and low pressures are highly suitable for tasks like monitoring filter clogging and determining fluid flow rates, especially when paired with depressurizing devices
• Relative or vacuum sensors within pressure transmitters are better suited for gauging static pressure or negative gauge pressure, typically when the sensor is exposed to pressure from sources like pumps or compressors.
• Absolute pressure transmitters are utilized in applications where pressure measurements are referenced relative to a perfect vacuum

Question 4: What is the fluid temperature?
Fluid temperature is a critical aspect to contemplate when choosing a pressure transmitter. These transmitters are typically engineered to function effectively with liquids, gases, or steam within specific temperature thresholds. The minimum and maximum operational temperature parameters of pressure transmitters play a significant role in selecting a sensor for prolonged usage. In instances of elevated temperatures, employing pressure transmitters with diaphragm seals becomes imperative to safeguard the sensor electronics from the process measurements.

Question 5: What is my measurement range?
The pressure range stands as the ultimate factor to ponder when deciding on a pressure transmitter. It’s imperative to select the zero and span parameters carefully to encompass the relevant range while avoiding surpassing the upper or lower limits necessary for accurate measurements.

Question 6: How corrosive is the fluid?
The corrosive nature of the fluid, whether contaminated or chemically aggressive, must be carefully considered when choosing a pressure transmitter. Certain fluids can corrode sensitive materials under specific conditions, influencing the selection of materials for components in contact with the fluid. This selection significantly impacts the sensor’s lifespan. It’s essential to verify the compatibility of the fluid with the construction materials of your pressure transmitter.

Question 7: What process connections are planned?
The variety of process connections—whether flanged, threaded, screwed, or hygienic—is another aspect to weigh when selecting the appropriate pressure transmitter. Different types of process connections cater to specific application needs:

• Flanged connections enable high pressure ratings with minimal pressure drops
• Threaded connections facilitate easy linking of hoses, tubes, and valves
• Hygienic connections ensure food safety during processing through sanitary designs

Question 8: What are the environmental conditions?
Environmental conditions within the application, including temperature, humidity, explosive atmosphere, dust, electromagnetic compatibility (EMC), vibrations, and safety integrity level (SIL), are additional crucial considerations when selecting a pressure transmitter. It’s essential to comprehend the operational context of the pressure transmitters and verify their ability to endure all potential conditions in their application environment. Furthermore, determining if your application necessitates specific safety certifications is imperative. Selecting a pressure transmitter with certifications such as SIL2 or ATEX, IECEx, etc., ensures compliance with safety requirements.

Question 9: What are the specific requirements of my application?
Specific requirements tailored to the application:

Flow measurement by differential pressure with a primary element

Differential pressure flow measurement is based on the pressure difference in a flowing fluid. This is achieved through the use of specific primary elements.

Examples of depressurizers include orifice plates, venturi tubes or nozzles. Other options include V-ConeTM flowmeters, averaged Pitot tubes, integrated orifices, and microventuris.

Differential pressure flow meters are used to measure the flow of liquids and gases in a pipe.

What is the nature of the fluid?

The nature of the fluid, such as gas, liquid or vapour, is an important factor to take into account when measuring processes.

Knowing the critical properties of the fluid to be measured is the key to choosing the right sensor for your industrial process.

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What is the fluid temperature?

Fluid temperature is another important factor to consider when selecting a pressure transmitter.
pressure transmitters are generally designed to operate with liquids, gases or steam within a given temperature range.

The minimum and maximum operating temperature limits of pressure transmitters are an important consideration when selecting a sensor for long-term use.

For high temperatures, you will need to use pressure transmitters at diaphragm seals to keep the sensor electronics away from the process measurement.

What is my measurement range?

The pressure range is the final other element to consider when choosing a pressure transmitter.

The zero and span must be chosen to cover the applicable range without going beyond the upper or lower limit over which you need accurate measurements.

How corrosive is the fluid?

The corrosiveness of the fluid: contaminated, chemically aggressive.
It is important to take into account the corrosiveness of the liquids and gases for which you select a pressure transmitter.
Sensitive materials can be corroded by certain fluids under certain conditions.
This corrosiveness determines the choice of material for parts in contact with the fluid.
This choice has a significant effect on the life of the sensor.
Check the compatibility of the fluid with the materials of construction of your pressure transmitter.

What process connections are planned?

The type of process connection: flanged, threaded, screwed or hygienic is another factor to consider when choosing the right pressure transmitter.

Process connections are available in different types depending on the type of connection required for the application:

• The flanged process connection can be used to achieve high pressure ratings with low pressure drops.
• The threaded process connection is normally used to easily connect hoses, tubes and valves.
• The hygienic process connection guarantees food safety during processing using sanitary designs.

What are the environmental conditions?

The application's environmental conditions: temperature and humidity, explosive atmosphere, dust, EMC, vibrations, safety integrity level ( SIL) are other important factors to consider when choosing a pressure transmitter.

You need to understand how the pressure transmitters will be used, and ensure that they can withstand all potential conditions in their application environment.

You need to know whether your application requires specific types of safety certification and choose a pressure transmitter SIL2 or ATEX, IECEx, etc.

Remember to choose the right pressure transmitter

Choosing the right pressure transmitter for your application can be difficult.

There are many factors to consider when selecting a pressure transmitter. In particular, if you need an industrial or food-grade option.

The other crucial point is to define the type of process connection required.

Finally, it is important to take into account the environmental conditions to which the transmitter will be subjected during its lifetime.

These nine questions should help you make certain decisions as you make this important investment in your business.

Let us know if you have any other specific needs that are not covered here, so that our experts can recommend solutions tailored to your unique situation!

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