What is the importance of precise temperature measurement in the chemical industry?

Temperature is one of the most important control parameters in chemical processes. It affects the rate of chemical reactions, the chemical equilibrium and the physico-chemical properties of raw materials and products. In many chemical processes, such as distillation, crystallisation, polymerisation or fermentation, precise temperature control is crucial to obtain the desired results. Furthermore, it directly affects the physical state and chemical properties of raw materials and final products. For example, in polymerisation processes, the temperature must be carefully controlled to ensure the correct polymer structure. If the temperature is too high or too low, it can lead to undesirable by-products, a reduction in process yield, and a deterioration in product quality.

What type of temperature sensors to choose for the chemical industry?

Different types of temperature sensors are used in the chemical industry to meet the specific requirements of each process. Each type of sensor has its own unique properties that make it more suitable for specific applications. From thermocouples, which are ideal for high-temperature measurements, to resistive sensors for high accuracy, the variety of sensors allows for effective temperature monitoring and control in diverse industrial environments. Below are the most important types of temperature sensors used in the industry:

Dial thermometers

Dial thermometers, also known as manometric thermometers, work on the principle of thermal expansion of a liquid, gas or metal, which causes the pointer on the dial to swing. They are commonly used where there is no access to electrical power or where independence from an energy source is required. Disc thermometers are characterised by their simple design, reliability and resistance to extreme environmental conditions.

Resistance temperature sensors

Resistance temperature sensors, such as Pt100 and Pt1000, work on the principle that the resistance of a conductive material (usually platinum) changes with temperature. The higher the temperature, the higher the resistance. RTDs are valued for their high accuracy and measurement stability, making them an ideal choice for applications requiring precise temperature control. JUMO RTD sensors, such as the JUMO PROCESStemp, offer high precision and reliability, making them widely used in the chemical industry.

Thermocouples for the chemical industry

Thermocouples consist of two different metals joined at a single point. When the junction is heated, an electromotive force (SEM) is created, which is proportional to the temperature difference between the junction and the ends of the wires. Thermocouples are widely used because of their wide temperature range, short response time and resistance to harsh environments. Our DIN EN-compliant mineral insulated thermocouples offer reliability and durability under extreme process conditions.

Wireless temperature sensors

Wireless temperature sensors offer the flexibility and convenience of temperature monitoring in hard-to-reach areas or on moving machine parts. They transmit data via radio signals to the receiver, eliminating the need for cables. JUMO Wtrans T wireless temperature sensors offer a state-of-the-art temperature monitoring solution with real-time data transfer capability, enhancing the efficiency and safety of industrial processes. In addition, the Wtrans T03 Ex version has been designed for hazardous areas.

Safety and Compliance of Measurement Sensors with ATEX Standards

The Importance of ATEX Certification in the Chemical Industry: ATEX (Atmosphères Explosibles) is a set of European directives that define the requirements for equipment and protective systems intended for use in potentially explosive atmospheres. ATEX certification is crucial in the chemical industry, where explosive mixtures often arise due to the presence of flammable gases, vapors, and dust. ATEX-certified products ensure they are safe to use in such conditions, minimizing the risk of explosions and protecting personnel and plant infrastructure.

Application of ATEX-Certified Products in Explosion-Hazard Zones: ATEX-certified devices are used in areas where there is a risk of explosive atmospheres. These can include:

• Production Zones: Where chemical substances are stored and processed.
• Warehouses: Where flammable materials are stored.
• Processing Plants: Where explosive mixtures can occur during normal operations or due to malfunctions.

Examples of JUMO Products with ATEX Certification:

1. JUMO Dtrans T100: An ATEX-certified RTD temperature probe without a transmitter for Pt100/Pt500/Pt1000. It provides precise and safe temperature measurements in explosion-hazard zones.
2. JUMO Wtrans T03 Ex: Wireless ATEX-certified temperature probes offering modern solutions for temperature monitoring in challenging conditions.

How Should Measurement Sensors for Aggressive Environments Be Made? Commonly Used Materials in Measurement Devices for the Chemical Industry

In the chemical industry, measurement devices are exposed to aggressive chemical substances, high temperatures, and pressure. Therefore, it is crucial to use materials resistant to corrosion and chemical reactions. Selecting appropriate materials ensures the durability, reliability, and safety of measurement devices, directly impacting the accuracy of measurements and the continuity of production processes.

Examples of Materials:

• CrNi Steel (Chromium-Nickel Steel): Commonly used due to its corrosion resistance and high mechanical strength.
• Titanium: Resistant to many aggressive chemicals, lightweight, and durable, making it ideal for challenging conditions.
• Tantalum: Offers high corrosion resistance, particularly in acidic environments.
• Inconel®: A nickel alloy that is highly resistant to corrosion and oxidation at high temperatures.
• HASTELLOY®: A superalloy known for its corrosion resistance, especially in the presence of acids and chlorine compounds.
• Ceramics: Highly resistant to high temperatures and chemicals, used in extreme conditions.

About the author

My name is Ewelina Szmit and I have been working in the field of content marketing for several years, combining my professional skills with my passion for writing. I believe that even the most technical topics can be presented in a way that is interesting and accessible to everyone. Outside of work, I develop my creativity by making newspaper collages. I like to spend my free time most actively, walking my dog or running.

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