Chapter 1
Things to know before measuring temperature in an explosion proof environment
In chemical plants, oil and gas-related facilities, semiconductor manufacturing facilities, and other similar establishments, explosive atmospheres can be formed due to flammable gases and vapors.
When using electrical equipment in such locations, it is important to choose equipment with explosion proof structure suitable for the environment to prevent the equipment itself from becoming an ignition source.
explosion proof Selecting equipment is not limited to temperature measurement devices alone. Equipment is selected after confirming the hazards at the actual site of use, the required explosion proof specifications, and installation conditions.
Regarding explosion proof equipment, the Industrial Safety Technology Association (TIIS) publishes information on the certification of explosion proof structure electrical machinery and equipment.
Chapter 2
Basic knowledge of explosion proof environments and radiation thermometer
What are dangerous places?
When selecting explosion proof equipment, it is necessary to check for hazardous locations where flammable gases or vapors may be present.
In domestic explosion proof related documents, the classifications "specially hazardous locations," "Class 1 hazardous locations," and "Class 2 hazardous locations," which correspond to Zone 0, Zone 1, and Zone 2 of the IEC standard, are used.
| classification | Overview |
|---|---|
| Zone 0 | A location where an explosive atmosphere may be present continuously, for extended periods, or frequently. |
| Zone 1 | A location where an explosive atmosphere may occasionally be generated, even under normal operating conditions. |
| Zone 2 | A location where an explosive atmosphere is unlikely to be generated under normal operating conditions, and where, if it is generated, it only exists for a short time. |
*The classification of a hazardous location is determined based on equipment, substances, emission sources, ventilation conditions, etc. The above is a general explanation; actual determination of a hazardous location should follow relevant standards, laws, and equipment conditions.
Why are radiation thermometer used in explosion proof environments?
radiation thermometer can measure surface temperature without touching the object. Therefore, they can be used to measure the temperature of objects where it is difficult to attach contact-type temperature sensors, such as inside furnaces, high-temperature equipment, and moving products.
Non-contact measurement
Surface temperature can be measured without directly contacting the object with the sensor.
High temperature target
It can be used for temperature control of objects that are difficult to measure with contact methods, such as heated equipment and products.
Continuous monitoring
In a fixed-point configuration, the temperature during process can be continuously monitored.
Chapter 3
Key points for selecting a pressure-explosion proof radiation thermometer
When using radiation thermometer in explosion proof environment, it's important to check whether specifications of the equipment and the intended use are compatible, rather than assuming that it's "suitable because it's explosion-explosion proof."
1. explosion proof structure and working conditions
There are several types of explosion proof structure, including pressure-resistant explosion proof and intrinsically safe explosion proof. TIIS categorizes explosion proof structure as follows: IEC 60079-1 is designated as pressure-resistant explosion proof structure "d", and IEC 60079-11 is designated as intrinsically safe explosion proof structure "i".
The appropriate explosion proof structure depends on factors such as the hazardous location, equipment configuration, and the specific explosion proof conditions being addressed.
2. Check the certification/verification.
When using explosion proof explosion proof in Japan, you must check the testing and certification requirements for the equipment in question. Please select the equipment after checking the product model, display, explosion proof symbols, and testing/certification information.
explosion proof When it comes to equipment, it is important not only to check whether it is labeled as “explosion proof-compliant,” but also to verify that the explosion proof specifications and certification information display for the specific location and product are correct.
3. Measurement temperature range
In addition to explosion proof performance, we also check whether the device covers the actual temperature range we want to measure.
- Normal temperature
- Minimum/maximum temperature
- Peak temperature that occurs for only a short time
- Speed of temperature change
4. Measurement distance and measurement diameter
With radiation thermometer, the relationship between the measurement distance and the measurement diameter is also important. You need to check whether the measurement area is sufficiently smaller than the object being measured, including any misalignment of the optical axis.
5. Installation Method and Maintainability
In explosion proof environments, installation conditions must be checked not only for the thermometer itself, but also for the measurement window, wiring, cable routing, and surrounding components.
Chino's IR-CZD series offers configuration that enhance the maintainability of the measurement window when combined with sealing window.
Chapter 4
Features and applications of pressure-resistant explosion proof radiation thermometer
Explosion-explosion proof radiation thermometer are a good option when you want to measure temperature non-contact in environments where explosive atmospheres may be present.
Semiconductor-related equipment
It may be used for non-contact temperature measurement in manufacturing equipment where temperature control is critical, such as CVD (Chemical Vapor Deposition) systems.
chemical plant
It may be used in facilities where temperature control is related to process conditions, such as reaction equipment and process lines.
Petroleum and energy-related equipment
It may be used in equipment where non-contact temperature monitoring is required, such as high-temperature equipment and heating process.
explosion proof When selecting equipment for a given environment, please verify not only the intended use but also the actual hazardous locations, the measurement targets, the surrounding equipment, and the required explosion proof specifications to ensure you select the appropriate equipment.
Chapter 5
Key points for on-site implementation and the importance of maintenance
Check the installation location.
Even if explosion proof device meets the required specifications, accurate temperature measurement is not possible if the measurement location or installation conditions are not appropriate.
- Measurement distance and measurement diameter
- Surface condition and emissivity of the object
- Condition of the measurement window
- Reflection and radiation from the surroundings
- Ambient temperature
- Environmental conditions such as vibration, dust, and moisture
Regular inspection and cleaning
With radiation thermometer, dirt on the lens or measuring window can affect the measurement conditions. It is important to determine the cleaning and inspection methods and frequency according to the usage environment.
Also plan about calibration.
When using measured values as important decision-making factors in quality control or process control, indicated value should be checked regularly, and calibration should be performed as needed.
Calibration cycles are not uniform; they are determined considering factors such as frequency of use, operating environment, required accuracy, and past calibration results.
The Importance of Non-Contact Temperature Measurement and Calibration
What is calibration?
Chapter 6
Chino IR-CZD explosion proof radiation thermometer
Chino's IR-CZD series is a pressure-explosion proof radiation thermometer that can measure temperature even in environments where flammable gases or flammable liquid vapors are present and there is a risk of explosion.
The IR-CZD series is a product certified by the Japan Industrial Safety Technology Association as "Ex db IIB T5 Gb". The type approval number is TC22717X.
Three series are available, each corresponding to a different temperature range.
| Models | Main detecting element | Measurement temperature range |
|---|---|---|
| IR-CZDP | InGaAs | 80～1400℃ |
| IR-CZDI | InGaAs | 200～2000℃ |
| IR-CZDS | Si | 450～3500℃ |
The actual measurement range varies depending on models and measurement conditions. It is also important to select a model that can adequately cover the object after confirming the relationship between the measurement distance and the measurement diameter.
explosion proof structure
It employs a pressure-explosion proof structure for use in explosion proof environments.
Small and lightweight
It achieves a compact and light-weight while maintaining explosion proof structure.
Maintainability of the measurement window
By combining it with sealing window, the maintainability of the measurement window can be improved.
operation from a non-hazardous location
When combined with a setting display unit, it can be configuration to be operation from a non-hazardous location.
FAQ
Frequently Asked Questions about Explosion-explosion proof radiation thermometer
Q. Can a standard radiation thermometer be used in an explosion proof area?
Standard radiation thermometer devices may not necessarily be usable as-is in explosion proof areas. You must verify the conditions of the location and the device’s explosion proof specifications and certification information to select a compatible device.
Q. What is pressure-resistant explosion proof?
Pressure-resistant explosion proof is a type of explosion proof structure. It is based on the idea of withstanding explosions that occur inside equipment and preventing the flames from spreading to the outside explosive atmosphere.
Q. If explosion proof proof, can it be used in any hazardous location?
No. explosion proof equipment has requirements such as explosion proof structure and protection level, and you need to check if it is suitable for the hazardous location where it will be used. Check the product model display, certification information, and installation requirements.
Q. What is the measurement temperature range for the IR-CZD series?
It varies depending on models. There are three series: IR-CZDP, IR-CZDI, and IR-CZDS, each with a different temperature range. Please check the product specifications for detailed measurement range and accuracy.
Q. Do explosion proof radiation thermometer also need to be calibrated?
When using measured values as important decision-making factors in quality control or process control, it is crucial to regularly check indicated value and perform calibration as needed. Calibration methods and conditions should be confirmed according to the equipment specifications and application.
Summary
explosion proof In the environment, check both "explosion proof specifications" and the "Temperature Measurement Conditions" together.
When choosing a pressure-resistant explosion proof radiation thermometer, it's important not to simply look at whether it's "explosion proof proof," but to also check the hazardous location where it will be used, the required explosion proof proof conditions, and specifications necessary for temperature measurement.
In particular, considering explosion proof structure and certification, measurement temperature range, measurement distance and diameter, emissivity, installation conditions, and maintenance and calibration as a single measurement system makes it easier to reduce problems after implementation.
Check the installation location → explosion proof Check specifications → Check the temperature measurement conditions → Consider installation and maintenance
Chino offers a range of products and services related to temperature measurement, including the IR-CZD series of pressure-explosion proof infrared radiation thermometer, as well as radiation thermometer, temperature calibration equipment, and calibration services.
Reference
For those who want to learn more about explosion proof
For information regarding working conditions, certifications, and standards of explosion proof equipment, please also check the latest information from public and specialized organizations.
- Industrial Safety Technology Association (TIIS) "explosion proof structure machinery and equipment"
- Industrial Safety Technology Association (TIIS) "Information on Products that have passed inspection"
- Industrial Safety Technology Association (TIIS) "Standards to be used"
*You will be redirected to an external website. Please check the latest information regarding explosion proof laws, standards, and testing/certification conditions.
I would like to consult about temperature measurement in explosion proof environments.
Knowing the hazardous location where the equipment will be used, the object to be measured, the temperature range, the measurement distance, and the installation conditions will allow for a more specific selection of equipment.
I would like to consult about explosion proof temperature measurement.
