Non-contact temperature monitoring using an industrial pyrometer is one of the important requirements of today’s industrial processes. However, selecting a pyrometer can be overwhelming due to the numerous technical specifications and application processes.
At Tempsens our team of experienced engineers has assisted hundreds of industries worldwide, and from that experience we have been able to put together 9 key questions that you should ask before you start the procurement process for a pyrometer.
1. Material & Surface
Material identification is important when selecting the appropriate pyrometer for measuring; as emissivity varies according to the material’s surface condition and/or coatings. For measuring metallic targets, short wavelength pyrometers are used while long wavelength pyrometers are utilized for the measurement of non-metallic materials. Therefore, the same spectral sensitivity requirements should be met in order to accurately measure temperature within each application.
2. Temperature Requirements
Define your entire temperature range and the critical control point band where you will require highest accuracy. Pyrometers can span many temperatures, but accuracy peaks alone (in specific bands) between temperature limits. The models offered by Tempsens (i.e., -50 °c to 3,000 °c of temperature range) are specifically oriented towards providing accurate readings at specific temperature bands.
3. Target Size/Distance
The optical resolution and (D:S ratio) of a pyrometer determine the smallest a target can be at a certain distance. The target must then fully appear in the measurement field to avoid a background error in measurement. If high D:S optics are used then the target will either be at a distance or will be very small. A pyrometer using a D:S ratio will stabilize the measurement in a situation where there is motion in the target being measured.
4. Environmental factors
Heat, dust, smoke, humidity, fumes and obstruction are all examples of the environmental conditions that can affect the accuracy and durability of your pyrometer. Cooling, air purging and protective housings may all be necessary depending on the environmental conditions. Ratio pyrometers tend to withstand contamination better than other types; however, rugged designs and accessories will help to provide reliable pyrometer operation in difficult industrial environments.
5. Response time
The latency specifications of the pyrometric device are determined by the dynamic nature of the process. A fast process such as a laser weld will require a response time of milli sec, whereas casting or glass forming will require 50 – 200 m sec response time. Large thermal mass will allow for slower responding instruments. Tempsens offers a wide range of response times, from 2 m sec to 10 sec for specific application and also offering user selectable response time from dropdown list.
6. Aiming Accuracy
When setting up an infrared thermometer, precise aiming ensures that the area being measured falls completely within the target area without interference from background objects. Using dual laser or video-based aim systems will provide highly accurate aiming no matter what kind of conditions you might encounter. Tempsens has developed sophisticated aiming systems that provide remote verification of infrared thermometer alignment for repeatable use in challenging applications.
7. Radiation Signal Obstacles
The effectiveness of infrared measurement can be affected by obstacles such as flames, gases, windows, smoke, and plasma. Accurate temperature measurement through these obstructions requires selecting the appropriate wavelength
8. System Compatibility
To operate effectively, pyrometers need to pair with automated systems using either analog or digital connections (or both). A way to remotely configure and diagnose problems is important too. Configurable outputs and communication methods will ensure compatibility with contemporary control system designs and meet industry standards associated with Industry 4.0.
9. Calibration Compliance
Controlled industries are required to have traceable calibration and be compliant with regulations. Calibration of a pyrometer shall be in accordance with relevant NABL regional standards; its calibration must also be traceable back to an accredited laboratory. Certified calibration with documented uncertainty and field verification help assure that all measurements taken are accurate.
Conclusion
Choosing the right pyrometer based on your application process not only improves the process outcome, but has a better lifecycle value compared to the initial cost. Knowing the right requirements improves the product efficiency, reduces maintenance requirements and reduces production inefficiencies.
The experienced dealer provides application based products to help you reduce technical downtime, better after support and long-term process improvement collaboration.
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Frequently Asked Questions
Q1. What is the difference between single-wavelength and ratio pyrometers?
Single-wavelength pyrometers measure temperature at one wavelength for a specific process, requiring full field-of-view and known emissivity. Ratio pyrometers measure at two wavelengths as they are less sensitive to emissivity variations, partial targets, and lens contamination.
Q2. How do I determine correct emissivity settings?
Emissivity depends on material type, surface finish, and temperature. Tempsens provides emissivity consultation and recommends verification against contact measurements during commissioning.
Q3. What maintenance do pyrometers require?
Maintenance includes periodic lens cleaning, annual calibration verification, and air purge system checks. Tempsens provides maintenance training and preventive programs.
