ExplorIR-M Data Sheet
28Pages

ExplorIR®-MSmall Footprint Low Power CO2 Sensor DESCRIPTION The ExplorIR®-M is a small footprint low power NDIR CO2 sensor using state-of-the-art solid-state LED optical technology. The low power LEDs are manufactured in-house, giving GSS complete control of the CO2 sensor signal chain. The ExplorIR®-M is designed for applications that need to work reliably over a wide range of conditions and environments and with the minimum amount of real estate. The sensor is available in multiple versions, capable of measuring CO2 levels up to 100% concentration. FEATURES • Small footprint, low power CO2 sensor • 70ppm typical measurement accuracy • Measurement range up to 100% CO2 • Solid state NDIR LED optical technology • UART control and data interface • Built-in auto-zeroing APPLICATIONS • Agriculture • Healthcare • Safety • Aerospace • Food packaging • Incubators • Food storage and transportation BLOCK DIAGRAM Production Data, Revision 4.8, 23 June 2021 Page | 1 For regular updates, go to https://www.gassening.co.uk Copyright © 2020 Gas Sensing Solutions L

For regular updates, go to https://www.gassening.co.uk Production Data, Revision 4.8, 23 June 2021 Copyright © 2020 Gas Sensing Solution

Gas Sensing Solutions Ltd. Page | 3 For regular updates, go to https://www.gassening.co.uk Production Data, Revision 4.8, 23 June 2021 Copyright © 2020 Gas Sensing Solutions Ltd

ExplorIR®-M Small Footprint Low Power CO2 Sensor ORDERING INFORMATION EXPLORIR-M-X-X X 5 20 60 100 Temperature Range 1. Sensors are shipped individually See separate data sheet for ExplorIR®-M evaluation kit options. Gas Sensing Solutions Ltd. Page | 4 For regular updates, go to https://www.gassening.co.uk Production Data, Revision 4.8, 23 June 2021 Copyright © 2020 Gas Sensing Solutions Lt

ExplorIR®-MSmall Footprint Low Power CO2 Sensor Weight = ~8g PIN-OUT DESCRIPTION: ExplorIR®-M Production Data, Revision 4.8, 23 June 2021 Page | 5 For regular updates, go to https://www.gassening.co.uk Copyright © 2020 Gas Sensing Solutions Ltd.

ExplorIR®-MSmall Footprint Low Power CO2 Sensor ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are stress ratings only. Permanent damage to the ExplorIR® may be caused by continuously operating at or beyond these limits. The ExplorIR® functional operating limits and guaranteed performance specifications are given at the test conditions specified. ESD Sensitive Device. This sensor uses ESD sensitive components. It is therefore generically susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. MECHANICAL...

ExplorIR®-M Gas Sensing Solutions Small Footprint Low Power CO2 Sensor CO2 PERFORMANCE CHARACTERISTICS Test Conditions Unless Otherwise Specified VDD = 3.3V, GND = 0V. RH = 0% non-condensing, T= 25°C, Pressure = 1013mbar Production Data, Revision 4.8, 23 June 2021 Copyright © 2020 Gas Sensing Solutions Ltd. Page | 7 For regular updates, go to https://www.gassening.co.

ExplorIR®-MSmall Footprint Low Power CO2 Sensor ELECTRICAL CHARACTERISTICS Production Data, Revision 4.8, 23 June 2021 Page | 8 For regular updates, go to https://www.gassening.co.uk Copyright © 2020 Gas Sensing Solutions Ltd.

ExplorIR®-M Small Footprint Low Power CO2 Sensor METHOD OF OPERATION After power is applied to the ExplorIR®-M, the sensor will automatically start to take CO2 measurements using the Mode 1 default settings, where the sensor is pre-programmed to send CO2 measurement data at 2 readings per second. The measurement rate is fixed at 2 readings per second at a fixed 9600 baud rate. The sensor will return the previous CO2 measurement results if the user requests more frequent measurements. The ExplorIR®-M has 3 potential modes of operation. MODE 0 COMMAND MODE In this mode, the sensor is in a...

ExplorIR®-MSmall Footprint Low Power CO2 Sensor DIGITAL FILTER The CO2 gas chamber is illuminated with a nominal 4.25um wavelength LED and the signal received using a photo-diode. The signal from the photo-diode is processed and filtered by the sensor to remove noise and provide an accurate CO2 reading. High frequency noise coming from the sampling process is removed using a proprietary lowpass filter. The digital filter setting can be varied, allowing the user to reduce measurement noise at the expense of the measurement response time. The ideal digital filter setting is application...

ExplorIR®-M Small Footprint Low Power CO2 Sensor ZERO POINT SETTING There are a several methods available to the user to set the zero point of the sensor. The recommended user method is zero-point setting in a known gas concentration. In all cases, the best zero is obtained when the gas concentration is stable, and the sensor is at a stabilised temperature. Note that zero-point settings are not cumulative and only the latest zero-point setting is effective. For example, there is no benefit in zeroing in nitrogen, and then zeroing in a calibration gas. The sensor will store only the latest...

ExplorIR®-M Small Footprint Low Power CO2 Sensor that time, the zero point can be fine-tuned to correct the reading. This is typically used to implement automated zeroing routines. The known CO2 concentration value and the reported CO2 value from the sensor can be sent to the sensor using the ZERO POINT ADJUSTMENT command F. AUTO-ZERO FUNCTION The sensor has a built-in auto-zero function. To function correctly, the sensor must be exposed to typical background levels (400-450ppm) at least once during the auto-zero period. For example, many buildings will drop quickly to background CO2 levels...

ExplorIR®-M Small Footprint Low Power CO2 Sensor PRESSURE AND CONCENTRATION LEVEL COMPENSATION NDIR gas sensors detect the concentration of gas by measuring the degree of light absorption by the gas analyte. The degree of light absorption is converted into a concentration reported by the sensor. The absorption process is pressure and gas concentration dependent. In general, as the pressure increases, the reported gas concentration also increases. As the pressure decreases, the reported concentration decreases. This effect takes place at a molecular level and is common to all NDIR gas...