Your Contact to Sensirion

Umschlag

Contact

Contact our sensor experts:

Please contact us

Distributoren

Distributors & Representatives

Here you find the nearest distributor and/or representative in your area.

Learn more

Support Center

Please find here an overview of various support topics:

Go to Support Center

Standorte

Locations

Find out where we are located:

Our Locations

toggle menu
  • Home
  • Environmental Sensors
    • Humidity Sensors
      • Digital Humidity Sensor SHT4x (RH/T)
      • Digital Humidity Sensor SHT3x (RH/T)
      • Digital Humidity Sensor SHT85 (RH/T)
      • Digital Humidity Sensor SHTC3 (RH/T)
      • Digital Humidity Sensor SHTC1 (RH/T)
      • Digital Humidity and Temperature Module SCC30-DB (RH/T)
      • SF2 Filter Cap
      • SHT31 Smart Gadget Development Kit
      • Digital Humidity Sensor SHTW2 (RH/T) (NRND)
    • Temperature Sensors
      • Temperature Sensor STS3x
      • Temperature Sensor STS32
    • Multi-Pixel Gas Sensors SGP
      • VOC Sensor SGP40
      • VOC Sensor SGP30 / SGPC3 (NRND)
      • Multi-Gas, Humidity and Temperature Module SVM30 (NRND)
    • Particulate Matter Sensor SPS30
    • Carbon Dioxide Sensors
      • Carbon Dioxide Sensor SCD4x
      • Carbon Dioxide Sensor SCD30
      • Carbon Dioxide Sensor STC31
    • Formaldehyde Sensor Module SFA30
    • Nubo Air
    • Evaluation Kit SEK-Environmental Sensing
      • Evaluation Kit SEK-SCD41
      • Evaluation Kit SEK-SVM40
      • Evaluation Kit SEK-SFA30
    • Download Center
    • Support Center
    • Shop
  • Flow Sensors
    • Liquid Flow Meters
      • Lx – Compact Liquid Flow Meters
        • Liquid Flow Meter LG16
        • Liquid Flow Meter LG01
        • Liquid Flow Meter LS32-1500
      • SLx – Standalone Liquid Flow Meters
        • Liquid Flow Meter SLI
        • Liquid Flow Meter SLG
        • Liquid Flow Meter SLQ-QT105
        • Liquid Flow Meter SLQ-QT500
        • Liquid Flow Meter SLS-1500
      • Liquid Flow Sensor SLF3x
      • Liquid Flow Sensor LPG10
      • Liquid Flow Sensor LD20
      • Liquid Flow Meter Kits
      • Customized (OEM) Liquid Flow Meters
    • Mass Flow Meters for Gases
      • Mass Flow Meter SFM3000
      • Mass Flow Meters SFM3003 and SFM3013
      • Mass Flow Meter SFM3019
      • Mass Flow Meter SFM3100
      • Mass Flow Meter SFM3119
      • Mass Flow Meter SFM3200
      • Mass Flow Meter SFM3300
      • Mass Flow Meter SFM3400
      • Mass Flow Meter SFM4100
      • Mass Flow Meter SFM4200
      • Mass Flow Meter SFM4300
      • Mass Flow Meter SFM5300
      • Mass Flow Meter SFM5400
      • Mass Flow Meter Evaluation Kits
      • Customized (OEM) Mass Flow Meters
    • Mass Flow Controllers for Gases
      • Mass Flow Controller SFC5400
      • Mass Flow Controller SFC5300
      • Customized (OEM) Mass Flow Controllers
      • Evaluation Kit EK-F5x
    • Gas Sensors
    • Differential Pressure Sensors
      • Differential Pressure Sensor SDP3x
      • Differential Pressure Sensors SDP800 Series
      • Differential Pressure Sensor SDP2000
      • Fail-Safe Integration with Differential Pressure Sensors
      • Evaluation Kit EK-P4
      • Evaluation Kit EK-P5
    • Download Center
    • Support Center
    • Shop
    • Evaluation Kit SEK-Flow Sensing
  • Markets
    • Automotive
    • Industrial
      • Life Sciences, Diagnostics and Analytical Instruments
      • H2 Measurement
    • Medical
      • Ventilation
    • Consumer
  • About us
    • Sensirion – The Sensor Company
      • Company
      • Locations
      • Growth Drivers
      • Distribution Network
      • Executive Committee
      • Board of Directors
      • CMOSens® Technology
      • MOXSens® Technology
      • PASens® Technology
    • Newsroom
      • News and Press Releases
      • Trade Fairs 2021
      • Newsletter
      • Specialist Articles
      • Webinars
    • Brand Experience Portal
    • Sensirion Automotive Solutions
    • Investor Relations
    • Quality & Sustainability
    • Supplier Portal
    • Support Center
    • Partner Access
  • Career
    • Your Start
      • Professionals
      • Graduates
      • Students
      • Apprentices
      • Job Profiles
    • Career Openings
      • Employee
      • Internship
      • Apprentice
      • Sensirion Student Pool
      • Login applicant's portal
    • Employer Sensirion
      • Your Workplace
      • Our Values
      • Success Stories
      • Benefits
      • Career Opportunities
      • Employees Tell Their Stories
      • Career Videos
    • Great Place to Work®
    • Career Events 2021
    • Career News
    • Job Newsletter
    • Alumni Group
    • Student Ambassadors
    • Contact Recruiting Manager
  • Developers
  • ENG
  • DEU
  • CHI
  • JPN

No translation available

Sorry, this page is not available in English.

Continue to home page

Keine Übersetzung verfügbar

Leider ist diese Seite nicht in Deutsch verfügbar.

Weiter zur Startseite

本页没有翻译

抱歉,本页没有英文翻译

继续浏览主页

和訳はありません

申し訳ありません。このページの和訳はありません

ホームページに戻る

    Contact

    search
    cart
    DOWNLOAD CENTER BUY NOW INVESTORS
    Sensirion AG Switzerland
    • Home
    • Environmental Sensors
      • Humidity Sensors
        • Digital Humidity Sensor SHT4x (RH/T)
        • Digital Humidity Sensor SHT3x (RH/T)
        • Digital Humidity Sensor SHT85 (RH/T)
        • Digital Humidity Sensor SHTC3 (RH/T)
        • Digital Humidity Sensor SHTC1 (RH/T)
        • Digital Humidity and Temperature Module SCC30-DB (RH/T)
        • SF2 Filter Cap
        • SHT31 Smart Gadget Development Kit
        • Digital Humidity Sensor SHTW2 (RH/T) (NRND)
      • Temperature Sensors
        • Temperature Sensor STS3x
        • Temperature Sensor STS32
      • Multi-Pixel Gas Sensors SGP
        • VOC Sensor SGP40
        • VOC Sensor SGP30 / SGPC3 (NRND)
        • Multi-Gas, Humidity and Temperature Module SVM30 (NRND)
      • Particulate Matter Sensor SPS30
      • Carbon Dioxide Sensors
        • Carbon Dioxide Sensor SCD4x
        • Carbon Dioxide Sensor SCD30
        • Carbon Dioxide Sensor STC31
      • Formaldehyde Sensor Module SFA30
      • Nubo Air
      • Evaluation Kit SEK-Environmental Sensing
        • Evaluation Kit SEK-SCD41
        • Evaluation Kit SEK-SVM40
        • Evaluation Kit SEK-SFA30
      • Download Center
      • Support Center
      • Shop
      • Formaldehyde Sensor SFA30

        Formaldehyde Sensing Made Easy

        The SFA30 is Sensirion’s new digital formaldehyde sensor designed for easy integration into air purifiers, demand-controlled ventilation systems, or indoor air quality monitors. Based on Sensirion’s electrochemical technology, the SFA30 offers excellent formaldehyde sensing performance with a uniquely low cross-sensitivity to other VOCs. The sensor module’s on-board SHT sensor provides accurate humidity and temperature readings and enables a fully temperature/humidity compensated and factory calibrated formaldehyde concentration output in ppb.

        More

    • Flow Sensors
      • Liquid Flow Meters
        • Lx – Compact Liquid Flow Meters
          • Liquid Flow Meter LG16
          • Liquid Flow Meter LG01
          • Liquid Flow Meter LS32-1500
        • SLx – Standalone Liquid Flow Meters
          • Liquid Flow Meter SLI
          • Liquid Flow Meter SLG
          • Liquid Flow Meter SLQ-QT105
          • Liquid Flow Meter SLQ-QT500
          • Liquid Flow Meter SLS-1500
        • Liquid Flow Sensor SLF3x
        • Liquid Flow Sensor LPG10
        • Liquid Flow Sensor LD20
        • Liquid Flow Meter Kits
        • Customized (OEM) Liquid Flow Meters
      • Mass Flow Meters for Gases
        • Mass Flow Meter SFM3000
        • Mass Flow Meters SFM3003 and SFM3013
        • Mass Flow Meter SFM3019
        • Mass Flow Meter SFM3100
        • Mass Flow Meter SFM3119
        • Mass Flow Meter SFM3200
        • Mass Flow Meter SFM3300
        • Mass Flow Meter SFM3400
        • Mass Flow Meter SFM4100
        • Mass Flow Meter SFM4200
        • Mass Flow Meter SFM4300
        • Mass Flow Meter SFM5300
        • Mass Flow Meter SFM5400
        • Mass Flow Meter Evaluation Kits
        • Customized (OEM) Mass Flow Meters
      • Mass Flow Controllers for Gases
        • Mass Flow Controller SFC5400
        • Mass Flow Controller SFC5300
        • Customized (OEM) Mass Flow Controllers
        • Evaluation Kit EK-F5x
      • Gas Sensors
      • Differential Pressure Sensors
        • Differential Pressure Sensor SDP3x
        • Differential Pressure Sensors SDP800 Series
        • Differential Pressure Sensor SDP2000
        • Fail-Safe Integration with Differential Pressure Sensors
        • Evaluation Kit EK-P4
        • Evaluation Kit EK-P5
      • Download Center
      • Support Center
      • Shop
      • Evaluation Kit SEK-Flow Sensing
      • Product Highlight

        Evaluation kit for the single-use liquid flow sensor LD20-2600B

        The LD20-2600B single-use liquid flow sensor for fast, precise and reliable measurements of the lowest flow rates in biomedical applications was successfully launched three years ago. The evaluation kit for this OEM liquid flow sensor can now also be purchased online via Sensirion's distribution network.

        Read more

    • Markets
      • Automotive
      • Industrial
        • Life Sciences, Diagnostics and Analytical Instruments
        • H2 Measurement
      • Medical
        • Ventilation
      • Consumer
      • Our Markets

        Sensirion Markets Icons

        Experts for Smart Sensor Solutions

        Sensirion's sensors are used in a wide range of markets and different applications. Our high-quality environmental and flow sensors and sensor solutions improve energy efficiency and sustainability. They increase our safety, support our health and raise the quality of life. 

        Read more

    • About us
      • Sensirion – The Sensor Company
        • Company
        • Locations
        • Growth Drivers
        • Distribution Network
        • Executive Committee
        • Board of Directors
        • CMOSens® Technology
        • MOXSens® Technology
        • PASens® Technology
      • Newsroom
        • News and Press Releases
        • Trade Fairs 2021
        • Newsletter
        • Specialist Articles
        • Webinars
      • Brand Experience Portal
      • Sensirion Automotive Solutions
      • Investor Relations
      • Quality & Sustainability
      • Supplier Portal
      • Support Center
      • Partner Access
      • Sensirion – The Sensor Company

        Sensirion Worldmap

        Sensirion Worldwide

        Founded in 1998 Sensirion has become the leading manufacturer of flow and environmental sensors solutions. The company now employs people in various countries such as the USA, South Korea, Japan, China, Taiwan, and Germany. The headquarters in Switzerland is responsible for research, development, and production. 

        Read more

    • Career
      • Your Start
        • Professionals
        • Graduates
        • Students
        • Apprentices
        • Job Profiles
      • Career Openings
        • Employee
        • Internship
        • Apprentice
        • Sensirion Student Pool
        • Login applicant's portal
      • Employer Sensirion
        • Your Workplace
        • Our Values
        • Success Stories
        • Benefits
        • Career Opportunities
        • Employees Tell Their Stories
        • Career Videos
      • Great Place to Work®
      • Career Events 2021
      • Career News
      • Job Newsletter
      • Alumni Group
      • Student Ambassadors
      • Contact Recruiting Manager
      • Most Popular Employer in Switzerland 2019

        Learn more: www.sensirion.com/GPTW

         

        Top Career Openings:

        • R&D Engineer MEMS
        • Senior Software Engineer 80-100%
        • Office Manager HR and Administration


        All our career openings

    • Developers
    Sensirion AG Switzerland
    • Market Trends in Refrigerant Leakage Detection

      Specialist Article

    • Home
    • About us
    • Newsroom
    • Specialist Articles

    Market Trends in Refrigerant Leakage Detection

    Author: Key Account Manager Manuel Eckstein, Inside Sales Administrator Katherine Lee

    To reduce environmental impact, the use of many common refrigerants has been restricted in recent years. The Heating, Ventilation, Air Conditioning, and Refrigeration (HVACR) industry are under increasing pressure to carefully select refrigerants, moving away from widely-used hydrofluorocarbons (HFCs) in favor of refrigerants with lower Global Warming Potential (GWP). Safe use of these relatively new refrigerants requires revised leakage detection technologies. These safety requirements are codified by new standards (such as UL 60335-2-40 3rd edition and IEC-60079-29-1). Following the latest decision of the California Air Resources Board (CARB), these new requirements will be incorporated into building standards as early as 2025 for residential and commercial air-conditioning equipment.

    In this article, we’ll take a look at the different classes of refrigerants used in the HVACR industry, current shifts in their usage, and some of the leak detection technologies which may be essential in enabling the industry to comply with new environmental and safety regulations.

    When ozone-depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) were phased out in response to the Montreal Protocol, hydrofluorocarbons (HFCs) were introduced to replace them.1 However, HFCs are potent greenhouse gases, and worldwide efforts are currently underway to reduce their usage.2

     
    Although the present contribution of HFCs to climate change is small, this is expected to rapidly increase if left unchecked. As a result, their use must be restricted to mitigate global warming. The Kigali amendment (October 2016) to the Montreal Protocol mandates a strict global phasing-down of HFCs.3

    As a result, the HVACR industry is turning towards alternative systems that make use of refrigerants with lower Global Warming Potential (GWP).4,5 But the adoption of low-GWP refrigerants presents its challenges.

    Classifying Refrigerants

    ASHRAE standard 34 broadly categorizes refrigerants according to their flammability and toxicity.6 Each refrigerant is assigned an identifying reference letter and number: the letter designates a toxicity class, and the number denotes flammability.

     

     

    Source: www.ashrae.org/file%20library/technical%20resources/refrigeration/factsheet_ashrae_english_20200424.pdf

    This safety classification system was recently updated to include the “2L” subclass of flammability, denoting class 2 refrigerants that are flammable but burn very slowly.6

    Traditional refrigerants – that is, HCFCs, CFCs, and the HFCs which initially replaced them – were chosen for safety and durability. As a result, they generally have low flammability and low toxicity. For example, the most commonly used CFC refrigerant, dichlorodifluoromethane, is categorized in safety group A1.

    There are a few viable candidates for refrigerant fluids that meet the dual requirements of low ozone-depletion potential and low global warming potential; including fluorinated alkenes (HFOs), hydrocarbons (e.g. propane), and low-GWP HFOs.7 The industry has been actively working to develop a new class of low-flammability refrigerants, known as A2L, to meet the lower GWP challenge – but the most practical options have one thing in common: they are more flammable than traditional refrigerants.4,7,8

    Safe Use of Environmentally Responsible Refrigerants

    Moving away from environmentally harmful HFCs will see many industries opting for flammable A2L-class refrigerants. The safety requirements of HVACR equipment using these flammable low-GWP refrigerants are codified by several new standards. In the USA, these include UL 60335-2-40 (3rd edition) and IEC-60079-29-1.4,9,10

    One of the primary risks associated with the use of these refrigerants is combustion or explosion following leakage. The standards mentioned above prescribe the use of leak detection equipment in HVACR applications in order to prevent this.

    Though the standards themselves don’t yet force anyone to use leak detection systems. However, with regards to residential and commercial air-conditioning equipment for example, state building codes will incorporate these standards as soon as 2025. The California Air Resources Board (CARB), for example, is pursuing an aggressive timeline to phase out HFCs in favor of A2L refrigerants.11 The proposed changes put OEMs under pressure to quickly adapt to the use of flammable refrigerants.

    Refrigerant Leak Detection Technology

    The two main candidate technologies for low-GWP refrigerant gas detection are Metal Oxide Semiconductor (MOS) and Nondispersive Infrared (NDIR).12,13

    Metal Oxide Semiconductor sensors operate on the principle that the electrical resistivity of certain semiconductor materials changes in response to surface interactions between the semiconductor and certain gases. Measuring the electrical resistance of a metal oxide semiconductor can therefore indicate the concentrations of gases and vapors in the air.

    MOS sensors are generally cheap to produce, and the technology is adaptable to a wide range of refrigerants. New MOS sensors have been developed to detect A2L refrigerants including HFC-32 and HFC-1234yf.13

    However, MOS sensors are not without their drawbacks. First among these is susceptibility to “drift”, which refers to natural de-calibration over time. All (gas) sensors must be calibrated so that they give an accurate reading in response to certain concentrations of gas. However, MOS sensors are particularly prone to loss of accuracy as the properties of the sensor gradually change in response to ambient conditions; which requires them to be regularly re-calibrated. 14,15

    The second issue with MOS sensors is low selectivity. They are often ineffective at distinguishing between target gases and other Volatile Organic Compounds (VOCs) such as ethanol, which can result in false positives.13

    In addition to these issues, MOS sensors degrade when exposed to refrigerants and other gases. This can result in permanent failure of an MOS-based gas detector after a single exposure to high refrigerant concentrations. This effectively means that MOS sensors are ‘single-use’: a single refrigerant leakage event can render MOS sensors unusable and in need of immediate replacement.

    Nondispersive Infrared sensors are spectroscopic. Different gas molecules have characteristic infrared absorption characteristics: NDIR sensors measure the decrease in IR transmission over a short path and use this information to determine the concentrations of target gases in the air.

    Source: www.mdpi.com/1424-8220/19/19/4260/htm

    NDIR sensors have much higher selectivity than MOS sensors and are already widely used for this reason. Importantly, they don’t experience degradation in the same way as MOS sensors and don’t suffer from the same drift issues.16 However, this comes at a price: NDIR sensors are much more expensive than MOS sensors.

    The Near Future of Refrigerant Gas Detection

    We can confidently expect an increase in the use of flammable low-GWP refrigerants in HVACR applications in the not-too-distant future. However, it is not yet clear whether NDIR- or MOS-type devices will be the dominant technology for the detection of these gases. Several other sensor technologies are currently under development for refrigerant detection applications, including those that measure local atmospheric Thermal Conductivity (TC) to determine the concentration of target gases.17


    We can anticipate that the response time given by a sensing solution may be a critical factor as OEMs need sufficient time to trigger the required mitigation actions when an alarming level is reached. Thermal conductivity-based sensors have been shown to outperform other sensor types in this regard, which may give them the edge over MOS or NDIR sensors for these applications.18

    Whichever technology emerges as the most common, this will be a developing market in the coming years due to the incorporation of new safety standards into legislation. It will be interesting to see how gas detection technology will adapt to new challenges in the HVACR industry.


    References and further reading

    1. Calm, J. M. & Hourahan, G. C. Physical, Safety, and Environmental Data for Current and Alternative Refrigerants. 22 (2011).
    2. Hydrofluorocarbons. Climate & Clean Air Coalition https://www.ccacoalition.org/en/slcps/hydrofluorocarbons-hfc.
    3. The Kigali Amendment (2016): The amendment to the Montreal Protocol agreed by the Twenty-Eighth Meeting of the Parties (Kigali, 10-15 October 2016) | Ozone Secretariat. https://ozone.unep.org/treaties/montreal-protocol/amendments/kigali-amendment-2016-amendment-montreal-protocol-agreed.
    4. Understanding UL 60335-2-40 Refrigerant Detector Requirements. UL https://www.ul.com/news/understanding-ul-60335-2-40-refrigerant-detector-requirements.
    5. Update on the Air-Conditioning Safety Standards for HVAC Equipment. UL https://www.ul.com/news/update-air-conditioning-safety-standards-hvac-equipment.
    6. ASHRAE New Refrigerant Designations and Safety Classifications. https://www.ashrae.org/file%20library/technical%20resources/refrigeration/factsheet_ashrae_english_20200424.pdf.
    7. Table 1 COP and volumetric capacity of selected low-GWP fluids and current HFC and HCFC fluids in the basic, liquid-line/suction-line heat exchanger (LL/SL) and economizer (Econ.) cycles.
    8. McLinden, M. O., Brown, J. S., Brignoli, R., Kazakov, A. F. & Domanski, P. A. Limited options for low-global-warming-potential refrigerants. Nature Communications 8, 14476 (2017).
    9. UL Standard | UL 60335-2-40. https://standardscatalog.ul.com/ProductDetail.aspx?productId=UL60335-2-40.
    10. IEC 60079-29-1:2016+AMD1:2020 CSV | IEC Webstore. https://webstore.iec.ch/publication/66754.
    11. Manufacturers Ask CARB to Extend Air Conditioning Deadline. https://www.achrnews.com/articles/143552-manufacturers-ask-carb-to-extend-air-conditioning-deadline?v=preview.
    12. Technology, I. E. Refrigerant leak detection: IR vs SEMICONDUCTOR SENSORS. Envirotech Online https://www.envirotech-online.com/news/gas-detection/8/net/refrigerant-leak-detection-ir-vs-semiconductor-sensors/46545.
    13. Izawa, K. SnO2-Based Gas Sensor for Detection of Refrigerant Gases. Proceedings 14, 32 (2019).
    14. Liu, H., Chu, R. & Tang, Z. Metal Oxide Gas Sensor Drift Compensation Using a Two-Dimensional Classifier Ensemble. Sensors 15, 10180–10193 (2015).

    Your Contact to Sensirion

    Umschlag

    Contact

    Contact our sensor experts:

    Please contact us

    Distributoren

    Distributors & Representatives

    Here you find the nearest distributor and/or representative in your area.

    Learn more

    Support Center

    Please find here an overview of various support topics:

    Go to Support Center

    Standorte

    Locations

    Find out where we are located:

    Our Locations

    Please Find Here Various Support Topics

    Buy Our Products at Your Local Distributor

    About Sensirion

    Environmental Sensors

    Flow Sensors

    Media/Newsroom

    Investors

    Useful Links

    Sensirion Automotive Solutions

    Career

    Support Center

    Partner Access

    General

    Terms and Conditions

    Terms and Conditions for US Customers

    Supplier Social Responsibility

    Quality, Environment and Ethics

    Sensirion AG

    Laubisruetistrasse 50

    8712 Staefa ZH, Switzerland

    Tel. +41 44 306 40 00

    infosensirioncom

    2021 © Sensirion AG Switzerland
    • Home
    • Sitemap
    • Privacy Policy and Cookies
    • Imprint
    • Login
    • Disclaimer