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  • Offer Profile
  • Welcome to the Website of
    Heimann Sensor

    We are the technology leader in Infrared thermopiles, develop and produce a broad spectrum of:
    • Thermopile Sensors & Modules
    • Thermopile Arrays & Imaging
    • Pyroelectric Sensors & other Sensors
    • IR Radiation Sources


     

Product Portfolio
  • Technology- and Marketleader for Infrared Thermopile Sensors

      • Thermopile Sensors

      • Heimann Sensor offers a wide range of thermopile sensors for non-contact temperature measurements and gas detection. Thermopiles consist of many thermocouples that are usually connected in series. They generate a small electric voltage when exposed to infrared (IR) radiation or heat. We produce sensor chips in different sizes. Small sensor chips like 0.6x0.6 mm² and 0.76x0.76 mm² are best for remote temperature measurements due to their optimized performance-cost ratio. The bigger chips like 1.2x1.2 mm² or even 2.1x2.1 mm² are ideally suited for gas detection. They provide enough signal to measure even high gas concentrations.

        Besides single element sensors in various packages from SMD to small TO-46 and TO-39, we also produce sensors with two or four elements for gas concentration measurements.

        All TO-packaged sensors can be equipped with a lens to reduce the field of view (FOV) to measure from larger distances or to provide a smaller measurement spot for more accurate temperature detection.

          • HCS Series
            SMD Thermopile Sensors for Remote Temperature Measurements and Gas Detection

          • The HCS Series provides a single thermopile sensor with application specific optical filter in a leadless SMD ceramic package. The footprint is only 3.8x3.8 mm² and the whole sensor has a thickness of 1.45 mm. The sensor supports a fully modular concept. You can choose a thermopile sensor chip and a top mounted infrared filter according to your application. Additionally, the sensor can be equipped with an optional thermistor providing a temperature reference.

            • Small leadless SMD Carrier with 3.8x3.8 mm² footprint
            • 3 different thermopile sensor chips available
            • Large number of optical filter options
            • Optional thermistor temperature reference
            • Wide field of view of 120 degree
            • Large operating range -20°C to 120°C
          • HTS A-Series
            Standard Single Detectors for Remote Temperature Measurements and Gas Detection

          • The HTS Series provides single element thermopile sensors in standard TO-39 packages. The sensor supports a fully modular concept. You can choose a thermopile sensor chip and a top mounted infrared filter according to your application. Additionally, the sensor can be equipped with an optional thermistor providing temperature reference.

            •     TO-39 package
            •     3 thermopile sensor chip options
            •     Large number of filter options
            •     Optional thermistor temperature reference
            •     Large operating range -20°C to 120°C
          • HTS L-Series
            Standard Single Detectors with Lens Optics for Remote Temperature Measurements

          • The HTS L-Series provides single element thermopile sensors with lens optics in standard TO-39 packages for stand-off temperature measurement. The sensor is suited for narrow fields of view and small measurement spots. This allows accurate temperature measurements at greater distances. Like all our single thermopile sensors, it supports any degree of integration favored by our customer. First, choose a thermopile sensor chip and an infrared filter according to your application. Equip it with an optional thermistor providing temperature reference. Add optional in-the-package signal processing in the form of an ASIC for analog ( HIS-Series ) or digital ( HID-Series ) output.

            •    TO-39 package
            •     Lens optics for narrow field of view
            •     High accuracy and larger distances
            •     Optional thermistor temperature reference
            •     Optional analog or digital ASIC in the package
            •     Large operating range -20°C to 120°C
          • HMS J-, K- and Z-Series
            Miniature Single Detectors for Remote Temperature Measurements and Gas Detection

          • The HMS Series are single element thermopile sensors in small or miniature TO-46 or µ-TO packages. They are primarily used for temperature measurements. Like all our sensors, the HMS sensors support a fully modular concept. You can choose a thermopile sensor chip and a top mounted infrared filter according to your application. Additionally, the sensor can be equipped with an optional thermistor providing temperature reference. Due to the small size of the µ-TO "Z" package, the HMS Z11 is not available as a sensor module with an integrated ASIC for signal processing. All other sensors can be equipped with an integrated ASIC for analog or digital signal conditioning which facilitates the application.

            • Small leadless SMD Carrier with 3.8x3.8 mm² footprint
            • 3 different thermopile sensor chips available
            • Large number of optical filter options
            • Optional thermistor temperature reference
            • Wide field of view of 120 degree
            • Large operating range -20°C to 120°C

             

          • HMS P-Series (Low Heat-Shock)

          • The HMS P-Series is a special design for low heat-shock behaviour. It is a single element thermopile sensors in small TO-46 package and are optimized for temperature measurements (e.g in-ear thermometers). Due to the stable measurements even in heat-shock situations the measurement speed can be increased without loosing accuracy. Like all our sensors, the HMS sensors support a fully modular concept. You can choose a thermopile sensor chip size and an infrared filter which is mounted from the outside to improve the measurement accuracy. Additionally, the sensor can be equipped with an optional thermistor providing temperature reference.

            • Special low heat-shock design
            • Fast and accurate measurements even in changing ambient temperatures
            • Small TO-46 package
            • 3 different thermopile sensor chips available
            • Large number of filter options
            • Integrated thermistor temperature reference
          • HMS M-Series
            Miniature Single Detectors with Lens Optics for Remote Temperature Measurements

          • The HMS M-Series are single thermopile sensors in small TO-46 packages with lens optics. They are designed for non-contact, short distance temperature measurements. Two different lens optics are available. In combination with the different thermopile chip sizes, a FOV between 12° and 28° is possible. The sensors are also available as modules with an integrated analog or digital signal conditioning unit for an easier application.

            • Small TO-46 housing
            • 3 different thermopile sensor chips available
            • Two different lens options
            • FOV from 12° to 28°
            • Optional thermistor temperature reference
            • Large operating range -20°C to 120°C
          • HTS Multichannel Series
            Dual and Quad Multichannel Detectors with Special Filters for Gas Concentration Measurements

          • The HTS Multichannel Series provide two or four independent sensor elements for multichannel gas concentration measurements in a small TO-39 metal housing. Typically, one to three channels are equipped with gas specific filters with different center wavelengths (CWL). The other channel serves as a reference and is equipped with a filter with CWL at which no absorption occurs. In general, a broad band filter will result in a high signal output, whereas a narrow band filter with low Half Power Bandwidth (HPBW) will allow high measurement accuracy.

            • 2 or 4 channels
            • 2 different thermopile sensor chip sizes
            • Large number of individual filter options
            • Thermistor temperature reference
            • Large operating range -20°C to 120°C

             

        • Thermopile Arrays and Imaging

        • Heimann Sensor has the world's most advanced thermopile technology for building low-cost/high-performance thermal imaging solutions. We offer a wide range of products ranging from small arrays with 8x8 elements, medium sized arrays with 16x16 and 32x32 elements to larget arrays with up to 80x64 and 120x84 elements for higher spatial resolutions. All our thermopile array sensor chips can be combined with different optics. They provide either wide fields-of-view with over 90° or narrow fields-of-view for measurements and detection from a greater distance.

          All our thermopile arrays have a built-in EEPROM for storage of calibration data. Our 8x8 arrays are installed inside a tinyTO-46 housing while our medium sized arrays are mounted in a still small TO-39. Due to their digital I²C interface, our small- and medium-sized arrays need only four pins for power supply and data transmission. Our large arrays fit into a TO-8 housing with 6 pins, communicate via an SPI interface and can be operated up to 40 Hz.

            • 8x8 Thermopile Array
              Low resolution 8x8 pixel array for body temperature measurements for distances up to 30 cm.

            • The HTPA8x8d is the world's smallest infrared sensor imaging array with a resolution of 8x8 pixels inside a TO-46 metal housing with IR lens as window. It has a 16-bit ADC resolution and built-in EEPROM to store all calibration data. With the digital I²C interface, only four pins are needed for operation. Framerates of 89 Hz and more are possible, depending on the ADC resolution. This is especially interesting for remote temperature measurements as it allows average multiple data frames for a more accurate measurement value. We are able to integrate a variety of optical lenses for a customized field of view and can perform the factory calibration if desired.

              • 8x8 thermopile pixel elements
              • Integrated optical lenses available
              • Built-in EEPROM
              • High frame rates of 89 Hz and more
              • Very low NETD of 115 mK
              • Ideal for remote temperature measurements, gesture and movement detection
            • 16x16 Thermopile Array
              Low resolution thermopile array with 16x16 pixel elements. Low cost alternative to the 32x32 array.

            • The HTPA16x16d is a low cost thermopile array with 16x16 pixels inside a TO-39 metal housing. This is a low cost alternative for the HTPA32x32d and can be used for thermal imaging, person detection and presence detection. Due to the digital I²C interface, only four pins are needed for operation. The integrated 16-bit ADC has a high resolution and the built-in EEPROM can store all calibration data. The HTPA16x16d can be operated with framerates between 40 Hz and 70 Hz depending on the chosen ADC resolution. Different optical lenses are available, and the field of view can range between 45 degrees to almost 90 degrees.

              For applications like person detection, for which no exact temperature value is required, the detection is based on contrast between target and background, and the array can be delivered without factory calibration at lower cost.

              • 16x16 thermopile pixel elements
              • Different field of view optical lenses
              • Low or high framerates of 40 Hz to 70 Hz
              • Low power consumption
              • Low cost alternative to the HTPA32x32d
              • Well suited for person and presence detection

               

            • 32x32 Thermopile Array
              Thermopile array with 32x32 pixels. Ideal solution for person detection, body temperature screening and low-resolution thermal imaging.

            • The HTPA32x32d is our high performance, high quality, digital signal thermopile array with 32x32 pixels inside a TO-39 metal housing. With the integrated optical lens, fields of view from 33° to 105° can be achieved. This makes the HTPA32x32d a perfect fit for person detection in smart building applications.

              Due to the digital I²C interface, only four pins are needed for operation. The built-in EEPROM stores calibration data, and the integrated ADC has 16-bit resolution. Framerates of 15 Hz to 27 Hz result, depending on the chosen ADC resolution. True shutterless and uncooled operation of the thermopile array ensures very low power consumption with a high performance.

              • 32x32 thermopile pixels
              • True shutterless operation
              • Up to 105° field of view
              • Framerates of 15 to 27 Hz
              • Small TO-39 metal housing with integrated optical lens
              • NETD of 140 mK
              • Best choice for person detection
            • 80x64 Thermopile Array
              Thermopile array with high spatial resolution of 80x64 pixels. Ideal for smart building applications in buildings with large spaces.

            • The HTPA80x64d is a small size, high performance, low cost thermopile infrared array for thermal imaging inside a TO-8 housing.

              Due to the digital SPI interface, only six pins are needed for operation. It has a 16-bit ADC and built-in EEPROM stores all calibration data. The framerate can be set individually and depends on the sensor clock and ADC resolution.

              For high 16-bit resolution, framerates of up to 20 Hz are possible, while lower ADC resolutions allow framerates of up to 30 Hz and more. Different available optical lenses, integrated with the array in TO-8 housing, provide fields of view (FOV) from 12x9 degree up to 120x90 degree.

              • 80x64 thermopile pixels
              • True shutterless operation
              • 12x9° to 120x90° FOV
              • High framerates of 9 Hz to 60 Hz
              • 16-bit ADC resolution
              • High object temperature range
            • 120x84 Thermopile Array
              Our thermopile array with the highest spatial resolution of 120x84 pixels. Ideal for thermal imaging applications.

            • The HTPA120x84d is our highest resolution thermopile infrared array inside a TO-8 housing, which is best for thermal imaging.

              Due to the digital SPI interface, only six pins are needed for operation. It has a 16-bit ADC and built-in EEPROM stores all calibration data. The framerate can be set individually and depends on the sensor clock and ADC resolution

              For high 16-bit resolution, framerates of 9 Hz are possible, while lower ADC resolutions allow framerates of up to 30 Hz and more. Different available optical lenses, integrated with the array in TO-8 housing, provide fields of view (FOV) from 12x9 degree up to 120x90 degree.

              The 120x84 array can be used as drop-in solution for the 80x64 array as it provides the same PIN-out and dimensions.

              • 120x84 thermopile pixel elements
              • True shutterless operation
              • 12x9° to 120x90° FOV
              • high framerates of 9 Hz to 50 Hz
              • 16-bit ADC resolution
              •  high object temperature range
            • Thermopile Array Modules

            • We offer standardized or customized thermopile infrared array modules. That open an easy way to integrate thermopile infrared arrays in your application.

              In principle all types of thermopile array sensors from 8x8 to 80x64 pixel resolution can be delivered as module with customized connectivity such as USB, UDP or Power over Ethernet (PoE).

              Customized modules are a good choice if you don't have the resources to develop your own module or you need a fast and easy way to integrate our thermopile array sensors in your system. From an economical perspective it is in most cases recommended to develop your own solution if your application is targeted for large volumes. However up to a few thousand units per year the cost for developing your own solution can exceed the cost for just take a module ready to go.

              If you are interested in the possible options or there is another kind of connectivity that you are interested in, please contact our sales team through the contact form at the end of the page.

              • Customized modules with any array sensor
              • USB or UDP connectivity
              • Power over Ethernet (PoE)
              • Easy customer integration
              • Optimized calibration
              • Custom temperature range on request
          • Thermopile Modules

          • Heimann Sensor's thermopile modules consist of a thermopile sensor or thermopile array with an integrated ASIC for signal conditioning. The ASIC amplifies the small sensor's voltage and provides either an analog or a digital output. In the case of an analog output, you receive the amplified sensor voltage value. In the case of a digital output, it is possible to select between voltage and temperature value.

            All modules have an integrated linear temperature reference voltage. This voltage (in the analog case) or voltage value (in the digital case) can be obtained from a separate output channel.

              • HCM Series
                SMD thermopile sensor modules with anaog output for temperature measurements and gas detection.

              • The HCM Series provides a thermopile sensor chip and optical filter suited to the application plus an analog ASIC for signal conditioning inside a small SMD package. The gain of the ASIC can be preset to either 2150 or 4300 by an internal pull-up resistor. With the integrated linear temperature reference changing ambient temperature can be compensated for. The sensor supply voltage can be chosen in the range between 2.7 V and 5 V.

                • Small leadless SMD package
                • Integrated ASIC with analog output
                • Integrated linear temperature reference
                • Large number of optical filter options
                • Large operating range -20°C to 120°C
                • Ideal for gas concentration measurements
              • HMM Series - Miniature Digital
                Miniature thermopile modules in TO-46 housing with digital temperature or voltage output.

              • The HMM Series provides our smallest thermopile sensor chip and ASIC with digital output in a tiny TO-46 metal housing for non-contact temperature measurements. It features a digital temperature output or voltage readout in a SMBus compatible operation with an output range from -5°C to 115°C. In pulse width modulated (PWM) output mode, a desired output temperature range can be defined with respect to the desired temperature resolution. The sensor provides high accuracy over a wide temperature range with a resolution better than 0.1°C. This sensor is available as an "M-type" with integrated lens (L3.0) which provides a 4:1 distance-to-spot-ratio in comparison to the standard "J-type".

                • Tiny TO-46 metal housing
                • Integrated ASIC with digital temperature readout
                • SMBus compatible operation or PWM output
                • High accuracy over wide temperature range
                • Optional lens available
                • Ideal for non-contact temperature measurements
              • HIM Series - Miniature Analog
                Small TO-46 thermopile sensor modules with integrated ASIC and analog output.

              • The HIM Series is the miniature version of the HIS Series. It provides a thermopile sensor chip and an ASIC for analog signal conditioning in a small TO-46 housing. The ASIC amplifies the thermoelectric voltage and provides an analog output voltage. The gain can be preset to 4300 or 2150 depending on your application. The HIM Series can be equipped with thermopile chips that are 0.6x0.6mm, 0.76x0.76mm or 1.2x1.2mm. Bigger sensor chips result in a higher sensitivity and output signal. The HIM Series is optimized for non-contact temperature measurements. It can also be used for gas detection and gas concentration measurements.

                • Small TO-46 metal housing
                • Integrated ASIC with analog voltage output
                • Integrated linear temperature reference
                • Three different thermopile sensor chips sizes available
                • Large operating range -20°C to 120°C
                • Best for remote temperature measurements
              • HIS Series
                Single and Dual modules in TO-39 housing with integrated ASIC and analog voltage output.

              • The HIS Series (Heimann Integrated Sensor) devices include thermopile sensor chip, application specific optical filter and an ASIC for analog signal conditioning in a standard TO-39 metal housing. The ASIC amplifies the chip voltage and generates an analog voltage output signal. An integrated linear temperature reference is used for ambient temperature compensation. In addition to the single channel version (HIS A), we offer a dual version (HIS E222) for gas concentration measurements. For temperature measurements, we have different options of standard temperature filters at our disposal. For gas detection, we offer special filters providing the gas specific center wavelength (CWL) and narrow half power bandwidth (HPBW).

                • Integrated ASIC with analog output
                • Integrated linear temperature reference
                • Standard TO-39 package
                • Four different thermopile sensor chips sizes available
                • Large number of filter options
                • Large operating range -20°C to 120°C
              • HID-A and HID-L Series Digital Sensors
                TO-39 thermopile sensor modules with integrated ASIC , optional lens and digital output.

              • The HID A-Series thermopile sensor modules combine a thermopile sensor chip and application specific optical filter plus an ASIC with digital output inside a standard TO-39 package. With the HID L-Series, we offer an additional optical lens for smaller measurement spot sizes and a lens shade option to reduce unwanted reflections/signals. This allows more accurate temperature measurements or measurements from larger distances.

                The sensor output is either a digital voltage or a temperature value with a resolution of 0.1°C in a SMBus compatible operation.

                • Digital output temperature or voltage value
                • SMBus or PWM output signal
                • Large object temperature range from -40 to 380°C
                • High refresh rates of 10 Hz
                • Low power consumption of 3 to 5 mW
                • Ideal for temperature measurements
            • Pyroelectric Sensors

            • Pyroelectric single-element and multi-channel infrared detectors from Heimann Sensor are designed for usage in spectroscopy, pyrometry and security engineering applications. Very high values of specific detectivity D* in the range of 10 9 cm Hz 1/2 W -1 are achieved by using modern ion beam etching technology for extremely thin elements. The great variety of infrared sensor constructions makes it possible to realize custom-made solutions for moderate and large quantities with excellent price-performance ratio.
                • Single Detectors

                • Our pyroelectric single sensors are based on lithium tantalate and show a very high sensitivity of up to 10 9 cm Hz 1/2 W -1. Round and square elements are available with diameters or sides as listed below:
                  • 0.5 mm
                  • 1 mm
                  • 2 mm
                  • 3 mm
                • Dual and Quad Detectors

                • Sensors with two, three or four different spectral channels are available. The channels can be equipped with either Heimann Sensor standard optical filters or customized infrared filters according to a customer specification. The two- and three-channel sensors are also offered with thermal compensation.
                • Linear Arrays

                • Heimann Sensor's pyroelectric linear arrays are hybrid detectors with 128 or 256 responsive lithium tantalate elements and a multiplexing read out integrated circuit. The 128 element linear array has a pitch of 100 µm and element sizes of 90 µm x 100 µm, 90 µm x 500 µm or 90 µm x 1000 µm. The 256 element linear array has a 50 µm pitch and an element size of 42 µm x 100 µm. The pyroelectric chip and the read out circuit are arranged in a metal hermetic package with an infrared window that determines the spectral sensitivity.
              • IR Light Sources

              • For gas analysis, gas detection and gas concentration measurements an infrared (IR) light source is required. We offer two types of IR light sources. The HSL Series is a low-cost IR source which can be used for all applications where the absorption wavelenghts are shorter than 4.5 µm. For gases like CO or NOx, a broad band IR source of the EMIRS Series should be used to generate an appropriate signal level.
                  • HSL Series
                    Low cost infrared light sources for gas concentration measurements

                  • The HSL Series (Heimann Sensor Lamp) provides low cost and reliable infrared light sources with a long lifetime for nondispersive infrared (NDIR) gas detection by IR light absorption. These light sources can be used for wavelengths shorter than about 4.5 µm and are operated in DC or AC mode. In combination with our HTS Multichannel Sensors, they can be utilized to detect gases like CO2 or hydrocarbons (HC).

                    • Small form factor
                    • Good processability
                    • Long lifetime and high reliability
                    • Two versions: 60 mA and 115 mA
                    • Socket or non-Socket type
                  • EMIRS Series
                    High performance IR Sources for broad range gas analysis

                  • The EMIRS Series of integrated light sources is offered in cooperation with Axetris AG. These high performance infrared light sources have long-term stability and nearly ideal black body spectrum emittance. Due to the small chip sizes, they can be modulated at high frequencies of up to 100 Hz for wavelength ranges of up to 16 µm. With an optional reflector, the light is focused more precisely and consequently has seven times higher power on axis. The standard version is the EMIRS 200, which comes without a window in a TO39 package, while the small EMIRS 50 comes in a TO-46 package. Optionally, sapphire or other window materials are available.

                    • Small TO-46 or TO-39 header
                    • High electrical power of 187 or 450 mW
                    • Fast modulation and small thermal masses
                    • Reflector option for seven times higher signal
                    • Long lifetime of >10 years
                    • Ideal for gas detection of CO, NOx or SOx
                • Vacuum Sensors

                      • Vacuum Sensors - HVS Series

                      • The HVS Series is our vacuum sensing series. These miniature pirani-type vacuum sensors allow measurements in a pressure range from 1000 mbar (atmospheric pressure) down to 10-3 mbar (HVS 04), and 10 mbar down to 10-5 mbar resp. 10-6 mbar (HVS 03k resp. HVS 03g). They come in a small and robust TO-39 or TO-8 metal housing. Assembling the HVS 04 and HVS 03g in a TO-8 housing allows coverage of the full pressure range.

                        • Pirani measurement principle
                        • Very large pressure range 1000 mbar to 10-6 mbar
                        • Small form factor TO-39 or TO-8
                        • Robust metal housing
                        • High sensitivity
                  • Applications

                      • Thermal Imaging

                      • To generate a thermal image, many individual thermopile pixels are arranged in a two dimensional array. Starting with low resolution of 8x8 and 16x16 pixels, we also provide thermopile arrays with 32x32, 80x64 and 120x84 pixels. This allows our customers to generate thermal images with different spatial resolution for different applications. One of the main fields of interest of our customers include person detection in automation and security applications. Another area is hot spot detection, which includes a wide field of applications from engineering to fire suppression to industrial safety up to consumer goods.

                          • Person Detection

                          • Person Detection for building automation, energy savings as well as security and safety applications.

                            ntrusion Detection, the automated sensing of a new person or animal into a surveilled area, is one of the main applications of low-resolution thermopile arrays like Heimann Sensor's 32x32 or 80x64 array. It is used for safety and security as well as for making life easier and more comfortable. Examples are smart buildings with functions like smart HVAC control and smart lightning for energy savings. The same system can be used as a security alarm. Other functions include wellness checks of invalids and older people living alone, fire prevention and elevated body temperature detection.

                            The advantages of low-resolution thermopile arrays for these applications are:

                            • No privacy issues
                            • Independent illumination (day/night)
                            • Not affected by smoke in case of fire or while cooking
                            • Detection of stationary people (e.g. while sitting/sleeping)
                            • Low-cost


                            So let us have a closer look into some specific applications of person and presence detection. We will give a brief overview of some possible applications and discuss the potential benefits of using infrared thermopile arrays.

                          • Hot Spot Detection

                          • Hot spot detection for engineering and safety for industry and consumer applications.

                            Because thermopile arrays gather thermal images, it follows that they can be easily employed for hot spot detection applications. There are many fields in which the information about existing or developing hot spots is useful regarding fire prevention, predictive maintenance and energy savings. Typical applications for fire prevention and detection are stove top monitoring and fire risk detection in waste sorting plants, transportation or public spaces. Examples for predictive maintenance are bearing temperature monitoring, observation of electrical components and connections as well as hot spot detection in photovoltaic plants.

                            Stove Top Monitoring

                            Kitchen fires starting from the stove are the number one cause in fires at home. In most countries there are no requirements for fire detectors in the kitchen, because normal cooking procedures cause most fire detectors to give false alarms. But infrared thermopile detectors are not affected by haze or fog. So they can potentially make kitchen life safer. They can be used to monitor the stove top and shut it off before a critical temperature (e.g. ignition temperature of cooking oil) is reached.

                            In Scandinavian countries stove top monitoring systems of this type are mandatory. Preventing kitchen fires will also improve independence for people in assisted living situations with one big source of danger is eliminated.

                            Advantages of low resolution thermopile arrays for stove top monitoring:

                            • Large temperature range up to 500°C and more
                            • Independent of haze and smoke
                            • No privacy issues due to low resolution

                            Recommended sensors:

                            • HTPA 8x8d
                            • HTPA 16x16d
                        • Gas Detection

                        • Out thermopile sensors can be used to perform gas concentration measurements based Beers law and the nondispersive infrared (NDIR) gas detection principle. Simply stated, measuring the absorption of infrared radiation at a specific wavelength allows the determination of the concentration of a specific gas. All that is required is an infrared light source and one thermopile, but two single or one dual thermopile sensor are often used to improve accuracy by eliminating drift over time of the infrared source emission. Due to their small size and low thermal mass, NDIR gas detection with thermopile sensors can be very fast and require only little volume.
                            • Air Quality Monitoring

                            • Gases like CO 2 are detected and controlled by smart building ventilation solutions.

                              The level of CO2 concentration is the single most important indicator of indoor air quality and has a great influence on our health. Therefore, it is always a good idea to monitor CO2 levels in any indoor space that is occupied by people at home, in schools, in office or in cars. To keep the CO2 concentration low is vital for health and security. Together with a smart CO2 monitor it is even possible to save energy and protect the environment.

                              Indoor Air Quality

                              While the outside air CO2 concentration is more or less constant at a level of 400 to 450 ppm, the indoor CO2 concentration can be much higher, which will have significant influence on well-being and the ability to concentrate. A level of 1000 ppm is defined as the comfort threshold. This level should not be exceeded indoors or inside a car. A level of 1200 to 1600 ppm can have significant influence on a person's ability to mentally concentrate and will have large impact on his or her well-being. This could lead to serious danger while e.g. driving a car or operating heavy machinery.

                              If you are aware that exhaled air has a CO2 concentration of up to 30.000 ppm, you can easily imagine that the indoor air quality can deteriorate rapidly. This is true especially in cases of small rooms with large numbers of people and high activity levels.
                              air-quality-monitoring station for home automation
                              If the CO2 levels are monitored in office, class-rooms, at home and inside cars, this will have many positive effects. Besides the higher productivity of employees, it will help to reduce infection risks and can have positive impact on people with asthma or reduce car accidents caused by dizzy drivers.

                            • Gas Leak Detection

                            • Detection of dangerous and hazardous gases for safety and environmental protection.

                              Leaking flammable hydrocarbon gas can lead to health risks, environmental poisoning and high economic costs. The detection of gas leaks will help to limit and prevent these negative consequences. NDIR gas leak detection can be used for many different areas like natural gas (methane) in the fracking, petroleum and petrochemical industry to prevent them from uncontrolled release into environment. Also in households, gas leaks can lead to dangerous situations where gas leak detection can prevent harm from the people. In many HVAC applications, the detection of leaking refrigerants can save money as they are precious gases. Other industry-specific applications of gas leak detection include the food packing industry, where food like raw meat is packaged in a special atmosphere to keep it fresh.

                              NDIR gas sensors respond very well to most small molecule gases and are highly selective. With a suitable narrow band optical filter, it is possible to measure only the gas of interest. In contrast, other technologies like electrochemical sensors can have high cross sensitivity and might react also to other gases. Therefore, applying NDIR detection can result in high accuracy cost effective measurements.

                              For leak detection, small concentrations may be of interest and gas detection limits have to be taken into consideration. Due to the fact that thermopiles do not provide the highest detectivity, their detection limits are higher than some other technologies, but they provide the advantage of very affordable prices. The detection limit for a thermopile NDIR CO2 sensor is in the range of 9 ppm, while other technologies can achieve 4 ppm or less.
                              gas flame
                              In most cases thermopiles will be sufficient for the measurement task and is therefore often preferred over other technologies.

                              Recommended sensors for gas leak detection are:

                              • HTS Multichannel
                              • HIS E222 - Dual Module
                              • HCM E222 - Dual SMD
                              • Single Thermopiles with gas specific filter


                            • Capnography

                            • Capnography used in e.g. ventilation machines for premature babies or COVID-19 patients.

                              Capnography is commonly known as medical respiratory surveillance. It is used to monitor the CO2 concentration of human respiratory gases to detect any lung malfunction during medical treatments such as:

                              • Mechanical Ventilation and Intubation
                              • Pediatric sedation
                              • Postoperative wake-up
                              • Emergency transport

                              As capnography can give an early warning of hypoxia (low oxygen levels), which can lead to serious brain damage, it is a widely accepted method to ensure the health and safety of patients during many medical treatments. Medical associations like the American Society of Anesthesiologists (ASA) and Association of Anaesthetists of Great Britain and Ireland (AAGBI) made capnography mandatory to monitor ventilation e.g. during moderate to heavy sedation.
                              Besides the use of capnography for intensive care, it can also be used for bodyplethysmography to detect any kind of lung dysfunction like asthma, poor lung compliance or chest breathing. Ever smaller devices make capnography now suitable for home medical usage, e.g. to detect hyperventilation.

                          • Vacuum Sensing

                          • Our MEMS pirani vacuum sensors can be used for continuous pressure measurements ranging from atmosphere pressure (1000 mbar) down to 10-6 mbar. They can be applied in all kind of vacuum chambers, plasma chambers or in space applications.
                                • Vacuum Pressure

                                • Pirani type miniature vacuum pressure sensors based on Heimann MEMS technology.

                                  Besides thermopiles, Heimann Sensor also offers solutions for vacuum sensing for wide pressure ranges. These are MEMS type pirani vacuum sensors.