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12 Enabling the Industrial IoT Revolution IAQ sensors monitor total Volatile Organic Compounds (tVOCs) and CO 2 equivalent variations in confined spaces. This sensor will enable ventilation control, increased energy savings, and reduced cost-of-ownership. Measuring HVAC pressure for safety and performance Air filtration systems periodically experience airflow restrictions. Rather than hunt down the area restricting airflow, which can be a time-consuming effort, HVAC systems implement Filter Air Restriction (FAR) sensors. Applications are: • HVAC pressure • Exhaust pressure • Industrial filters Finding airflow problems can be simplified by using FAR sensors that accurately measure pressure loss across various air filtration devices. These devices utilize high accuracy, Negative Pressure Atmosphere (NPA) piezoresistive technology. (Figure 2) Monitoring HVAC Systems to Ensure Reliable Operation Pressure sensors can be micro-machined, absolute, sealed, and gauge types for harsh or benign media that need high accuracy. These sensors need to be robust, with various fittings and are ideal for automotive, industrial, and commercial applications. Key specifications are a maximum pressure capability of 51710.68kPa, an accuracy of less than +/- 1.00 percent of full scale, and a 125°C maximum operating pressure. Amphenol has such sensors. Amphenol All Sensors (AALS): ELV Analog and Digital Pressure Sensors Designers can customize calibration and pressure ranges with AALS ELV Series Analog and Digital Pressure Sensors. These sensors have proprietary ultra-low pressure CoBeam2™ technology, which uses an innovative sensing -element to provide best-in-class stability for low and ultra- low pressure ranges from ±0.5 psi in H2O to 150 psi and ±2.5 mbar to ±10 bar. These sensors are also available with customized calibrations and pressure ranges. A digital interface enables simple sensor integration into various process control and measurement systems allowing direct connection to serial communications channels. An analog interface is also available. (Figure 3) These calibrated and compensated sensors provide accurate, stable output over a wide temperature range spanning -25°C to +85°C. This series is intended for use with non-corrosive, non-ionic working fluids such as in air and other dry gases. A protective Parylene coating is optionally available for protection against moisture or harsh media. Applications for this series include environmental controls, environmental instrumentation, environmental monitoring, industrial controls, and HVAC. Figure 2: Air filter sensors are placed at the filtered air side of the air filter so that the FAR sensor can detect a decrease in airflow when a decreased pressure level is reached. (Image from Amphenol)