High temperature protected sensors and instruments for taking measurements of very hot liquid or gases.
These devices are designed to withstand high temperature process media and incorporate very high temperature tolerant components or are combined with a cooling assembly to protect the heat sensitive part of device.
- Thermal Management: Effective heat dissipation is crucial. Designs often incorporate heat sinks, thermally conductive enclosures, or even active cooling systems (air or liquid) to protect sensitive components.
- Remote Sensing: In some applications, extended probes place the sensing element in the hot environment while keeping electronics safely away from the heat source.
- Isolation Techniques: Sensing elements can be isolated from the heat source using techniques like oil-filled capillaries, coils, or extensions that create a stand-off distance, further reducing heat exposure.
High Temperature Pressure Transmitters - High temperature pressure transmitters with a 4-20mA output, tolerant to high temperature applications such as steam, food processing & engine monitoring.
High Temperature Liquid Level Sensors - Explore high-temperature liquid level sensors featuring cooling elements and thermal isolation for reliable measurement in hot media, including fully submersible designs.
High Temperature Pressure Gauges - Explore pressure gauges designed for high-temperature media. Learn about thermal isolation techniques like cooling elements, siphon tubes, and capillaries to protect sensitive components.
High Temperature Resistant Submersible Sensors and Instruments - High temperature protected submersible probes and instrumentation with electronics, housing and cable designed to be immersed in hot liquids.
High Temperature Voltage Output Pressure Transducers - High-temperature voltage output pressure transducers are specialized sensors designed to accurately measure the pressure of hot liquids or gases
High-temperature sensors and instruments are indispensable tools for accurate measurement in challenging industrial environments. While the term “high temperature” often conjures images of extreme heat, many critical processes operate within a more moderate range, typically up to 300°C. This range still presents significant challenges for instrumentation, requiring specialized designs and materials.
These specialized devices are engineered to withstand the rigors of elevated temperatures, ensuring reliable performance in demanding applications. These applications span a wide range of industries, including steam systems, chemical reactions, industrial food processing, and pharmaceutical manufacturing. Accurate temperature measurement is crucial in these processes for quality control, safety, and efficiency.
The design of high-temperature sensors and instruments prioritizes protecting the delicate sensing elements from heat damage. Several approaches are employed to achieve this. One common strategy involves using specialized materials that can withstand elevated temperatures. These materials might include specific grades of stainless steel, high-temperature polymers, or specialized ceramics.
Featured high temperature protected measurement products
- High Temperature Voltage Output Pressure Transducers - High-temperature voltage output pressure transducers are specialized sensors designed to accurately measure the pressure of hot liquids or gases
DS201P High Range Flush Pressure Gauge, Switch and Sensor - High pressure sensor, electronic switch and digital gauge with an all welded stainless steel flush diaphragm for high viscosity liquids.
These materials maintain their structural integrity and measurement accuracy even at higher temperatures, ensuring reliable performance. The choice of material depends on the specific temperature range and the nature of the process media. For particularly sensitive components, cooling mechanisms may be incorporated into the sensor design.
Cooling strategies can involve air or liquid cooling to dissipate heat away from sensitive electronics. In applications like steam sterilization in pharmaceutical production, where precise temperature control is paramount, sensors might be housed in thermally conductive enclosures. These enclosures, combined with heat sinks, help regulate the sensor’s operating temperature.
Similarly, in industrial food cooking, such as large-scale ovens or fryers, specialized sensor designs are employed. These designs often feature extended probes that position the sensing element within the hot environment while keeping the sensitive electronics safely away from the heat source. This approach ensures accurate temperature measurement of the food product without exposing the electronics to excessive heat.
Beyond material selection and cooling techniques, the selection of appropriate signal conditioning and transmission methods is also essential for accurate high-temperature measurements. Temperature fluctuations can induce signal drift, which can be compensated for using specialized circuitry or software algorithms.
Questions & Answers
Temperature stand-off pipe
What does it mean by “If its just process temperature, you should be able to reduce the temperature acting on the sensor significantly using a short length of stainless steel or copper pipework”?
Also called the ‘stand-off pipe’ or ‘impulse line’ method, it makes use of the difference between the cooler ambient air and the high process temperature, since the sensor is dead-ended, the process media will cool along the pipe. Also mounting the sensor upside down with the pipe running up from the sensor can help as well.
Other methods to consider using are Pig-Tails, U-tubes, which are all designed to cause a temperature drop between the process and the measurement instrumentation, and are much lower cost than what you would pay for a sensor with a built-in high temperature capability.
Featured high temperature protected measurement products
10 bar g steam pressure transmitter, indicator and PNP switch - Steam pressure transmitter with LED display indicator for measuring 0 to 10 bars with in-built temperature reducer
Aerospace component testing hi-temp air pressure sensor for up to 300C with 20 barg range - Conduct accurate aerospace component testing with the DMP 331P pressure sensor. With a 20 bar g range and 300°C temperature capability, it's ideal for testing pneumatic valves, heat exchangers, and sensors under simulated operating conditions.
Related Help Guides
- Understanding operating temperature limit specifications for pressure transducers
- Measuring the Pressure of Hot Media