Low Power CO2 Sensor with I2C Interface

A challenge for CO2 sensors is that they need mains power to operate, thus incurring costs for cabling, and in the case of installations in existing buildings, redecoration. Gas Sensing Solutions (GSS) (Cumbernauld, Scotland) has solved this problem with its low power (3 mw) LED-based sensor technology. The sensor’s power requirements are so low that wireless monitors can be built that measure CO2 levels as well as temperature and humidity with a battery life of over ten years. Being wireless means that they can be placed wherever they are required with no need for cabling or disruption and simply relocated as needs change. With the new I2C interface, the CozIR®- LP can be easily integrated into an IoT network. Booth: #1039

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MEMS Inertial Accelerometer

Initially launched as a strictly ±25-g product, the Model 2227 MEMS inertial accelerometer series from Silicon Designs (Kirkland, WA) is now offered in both ±10 g and ±50 g ranges. In addition to its direct drop-in replacement compatibilities, in terms of industry standard form factor and pin configuration, with traditional quartz inertial accelerometers, Model 2227 Series units now include a built-in adjustable scaling factor. That allows an end-user to achieve greater accelerometer voltage output flexibility, at any specified g-range, of as much as 25%. The design combines two capacitive silicon sense elements and a precision custom CMOS integrated circuit. The elements and circuit are housed together within a compact, low mass, hermetically sealed LCC package and are assembled on a high-temperature open printed circuit board (PCB) with a circuit that converts the MEMS accelerometer differential output voltage into a level of current directly proportional to the amount of applied acceleration. Booth: #825

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Miniaturized CO2 Sensor

Sensirion (Stafa, Switzerland) is announcing the SCD40 — a miniaturized CO2 and RH/T sensor that fits in a space of just one cubic centimeter. It utilizes the photoacoustic sensing principle and combines minimal size with maximum performance to open up numerous new integration and application possibilities. Due to its price-performance ratio, the SCD40 is especially well suited for high-volume and cost-sensitive applications.

The SCD40 footprint, at 12 × 12 × 7 mm3, has been miniaturized by a factor of 5 compared to its predecessor, the SCD30. Using the photoacoustic sensing principle, the dimensions of the optical cavity are drastically reduced without compromising sensor performance. Moreover, the SCD40 CO2 and RH/T incorporates a humidity and temperature sensor, thereby delivering two additional sensor outputs. It is intended to supply today’s and future CO2 sensing markets such as IoT, automotive, HVAC, appliances, and consumer goods.

Thanks to new energy standards and better insulation, buildings have become increasingly energy efficient, but at the cost of accelerated deterioration in air quality. Since high CO2 levels compromise human health and productivity, CO2 is a key indicator of indoor air quality. Air exchangers and smart ventilating systems in the commercial and the residential sector use CO2 sensors to regulate ventilation. Furthermore, CO2 sensors play an essential role in indoor air quality monitoring and can therefore be integrated into IAQ monitors, air purifiers, and smart thermostats. Booth: #324, M6

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Six Degrees of Freedom Sensor

Endevco/Meggitt (Irvine, CA) has released the model 7360A six degree of freedom (6DoF) sensor, which provides analog output for three axes of acceleration and three axes of rate sensors in a compact, roughly one-inch, cube. With this new sensor, professionals in automotive and aircraft development are now able to measure linear and rotational dynamics that previously required multiple sensors and much more space. Rather than having to make assumptions about these dynamic interactions, the 7360A provides reliable, empirical data to support the analytical results. It has five accelerometer ranges from 2g to 500g, six rate ranges from 100 deg/sec to 18,000 deg/sec, and 5,000g shock protection. It is calibrated in its final assembly configuration to ensure accurate performance. Booth: #625

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Improved GUI for Advanced Inertial Measurement Units

STMicroelectronics’ (Geneva, Switzerland) Unico GUI greatly simplifies configuring the finite state machine and machine learning core (FSM and MLC) logic of its latest Inertial Measurement Units (IMU), including the recently announced LSM6DSO and LSM6DSOX 6-axis modules. The FSM logic lets users run gesture and motion-recognition algorithms directly in the sensor for always-on convenience and low power consumption. The MLC implements machine-learning classifiers for real-time always-on motion and vibration pattern recognition. With Unico, GUI users can combine the module’s accelerometer and gyroscope data with inputs from additional external sensors, such as a magnetometer, for more sophisticated context-sensing capabilities.

When used in smartphones, wearables, or industrial devices it allows user-interface functions and context-aware apps to continue running while the main processor sleeps to maximize battery runtime. The LSM6DSO contains logic for up to 16 independent state machines, each generating a hardware interrupt activated by a specific motion pattern, while the LSM6DSOX also contains the logic to implement multiple-stage decision trees for machine-learning classification. Booth: #716, 722, 821

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Dissolved Oxygen Sensor

Endress+Hauser (Greenwood, IN) is releasing the Memosens COS81D hygienic optical sensor for measuring dissolved oxygen in fermenters and bioreactors used in the food, pharmaceutical, and biotechnology industries, as well as in drinking water and boiler feedwater applications. It measures dissolved oxygen, gaseous oxygen, and temperature with accuracy up to ±0.2% and can operate in process temperatures from 15 to 280 °F and pressures from 0 to190 psi. The sensor connects to a transmitter via a cable that transmits an optical digital signal. With its compact stainless steel 12-mm design with lengths currently up to 220 mm, the sensor withstands CIP and SIP procedures and its low sampling volume makes it well suited for residual oxygen measurement in water treatment and boiler feedwater. When replacing the sensor, the user calibrates it in the lab, inserts it into the sensor holder assembly, and it’s ready to begin measuring. Booth: #830

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High Operating Temperature Thermal Sensor Array

Melexis (Tessenderlo, Belgium) announces a new version of its far infrared (FIR) thermal sensor array. The new device has lower thermal noise compared to the current MLX90640, an increased refresh rate of 64 Hz, and an elevated operating temperature up to 125°C for applications especially in harsh thermal conditions.

The new MLX90641 is a small 16 x 12-pixel IR array housed in an industry standard 4-lead TO39 package. It can accurately measure temperatures in the range -40°C to +300°C. Factory calibration ensures an accuracy of 1°C in typical measurement conditions. The high accuracy is further supported by a Noise Equivalent Temperature Difference (NETD) of 0.1 Krms. Two different field of view (FoV) options are available, a standard 55° × 35° and a wide angle 110° × 75°. It offers 192 FIR pixels, allowing for less powerful processors to be used, contributing to lower system overhead. Booth: #1022

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