Questions you need to ask before choosing your industrial pressure ...

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:

Selection of Pressure Transmitters

How do you choose a pressure transmitter?
There are many types of pressure transmitters. When using it, it is necessary to select the appropriate type of pressure transmitter according to the needs. The main factors that need to be referred to when selecting the pressure transmitter are:

1. What kind of pressure is measured

First determine the maximum value of the measured pressure in the system. Generally speaking, it is necessary to select a pressure transmitter with a pressure range that is about 1.5 times larger than the maximum value.

2. What kind of pressure medium

Viscous liquids and mud will block the pressure port. Solvents or corrosive substances will not damage the materials in the transmitter that are in direct contact with these media. The above factors will determine whether to choose a direct isolation film and a material that is in direct contact with the medium.

3. Accuracy of pressure transmitter

The factors that determine the accuracy of pressure transmitters are nonlinearity, hysteresis, non-repeatability, temperature, zero offset scale, the influence of temperature, etc. The higher the accuracy, the higher the price.

4. Temperature range of pressure transmitter

Usually a transmitter will calibrate two temperature ranges. One of the temperature ranges is the normal operating temperature, and the other is the temperature compensation range. The normal operating temperature range refers to the temperature range when the transmitter is not damaged under working conditions. It may not meet the performance specification of its application when the temperature compensation range is exceeded.

5. What kind of output signal needs to be obtained

Digital output in mV, V, mA and frequency output. Which output to choose depends on many factors. Including the distance between the transmitter and the system controller or display. The presence of “noise” or other electronic interference signals. Whether an amplifier is required, amplifier location, etc.

The most economical and effective solution is to use mA output transmitters for many OEM devices with short distances between transmitters and controllers.

If the output signal needs to be amplified, it is best to use a transmitter with built-in amplification.

For long-distance transmission or strong electronic interference signals, it is best to use mA level output or frequency output.

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If in an environment with high RFI or EMI indicators, in addition to selecting mA or frequency output, special protection or filters should also be considered.

6. What kind of excitation voltage to choose

The type of output signal determines what excitation voltage to choose. Many transmitters have built-in voltage regulation and therefore have a wide range of supply voltages. Some transmitters are configured quantitatively and require a stable working voltage. Therefore, the working voltage determines whether to use a sensor with a regulator. When selecting a transmitter, the working voltage and system cost should be considered comprehensively.

7. Do you need an interchangeable pressure transmitter?

Determine if the required pressure transmitter can accommodate multiple usage systems. This is important in general, especially for OEM products. Once the product is delivered to the customer, the customer’s cost for calibration is considerable.

If the product has good interchangeability, even changing the pressure transmitter used will not affect the effect of the entire system.

8. The stability of the pressure transmitter after working overtime

Most pressure transmitters will “drift” after overwork. Therefore, it is necessary to know the stability of the transmitter before purchasing. This kind of pre-work can reduce all kinds of troubles in future use.

9. Protection level of pressure transmitter

The protection level of the pressure transmitter is often easily overlooked. However, this point will gradually expose its shortcomings in future use. When purchasing a transmitter, be sure to consider the working environment and humidity of the pressure transmitter in the future. How to install the transmitter. Will there be strong impact or vibration, etc.

10. What kind of connection is used between the pressure transmitter and other electronic equipment

Including whether to use short-distance connection? For long-distance connections, do I need to use a connector? These must be considered clearly.

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Selection principle of pressure transmitter

In addition to the above 10 points, we should pay attention to when selecting the pressure transmitter. When purchasing pressure transmitters, we also need to follow the following principles:

When selecting a pressure transmitter, some principles should also be paid attention to:

1. Applicable principles

The pressure transmitter with suitable pressure and accuracy should be selected based on the property index of the measured medium. For example, the measured medium is a place with high viscosity, easy crystallization and strong corrosion. You must choose an isolated transmitter.

2. Economic principles

From an economic point of view, the material of the outer diaphragm and the insert part is more important, and the appropriate one should be selected. However, the connecting flange can reduce the material requirements. If carbon steel is used, it will save a lot of cost.

3. The principle of convenience

The selected pressure transmitter should be easy to install and use. For example, in high-altitude areas, absolute pressure transmitters should be used; in places where wiring is inconvenient. A wireless pressure transmitter should be used.

4. The principle of easy maintenance

The selected pressure transmitter should be stable in use and not prone to failure problems. In case of failure, maintenance should be convenient.

5. Smart principles

In the era of intelligent development of industrial instruments, intelligent pressure transmitters should be given priority.

Selection of pressure transmitter must be decided before purchasing a pressure transmitter. To ensure the reasonable and reliable use of the pressure transmitter, it must be reasonably selected and installed correctly.

Selection of pressure transmitter is mainly considered from the measured medium, temperature environment, accuracy level, installation and maintenance costs, etc. After determining the manufacturer and model of the transmitter used, determine its range according to the requirements of use. When selecting the measurement range, the principles of adjustable range, high precision and moderate price should be followed.

Sino-Inst is a manufacturer of industrial pressure transmitters. We supply more than 50 kinds of pressure transmitters. Including diffused silicon pressure transmitters, capacitive pressure transmitters, single crystal silicon pressure transmitters, temperature and pressure dual-function transmitters, etc.

Sino-Inst has been supplying customers with high-quality, cost-effective industrial pressure transmitters for many years.

If you need to purchase Industrial Pressure Transmitters, or have any technical questions about Industrial Pressure Transmitters, please feel free to contact our engineers.

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