CozIR-A Data Sheet
32Pages

CozIR®-A Flexible Low Power CO2 Sensor DESCRIPTION The CozIR®-A is a 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 CozIR®-A's low power consumption is compatible with battery powered operation, allowing the sensor to be used in a wide variety of applications including wirelessly connected equipment. The sensor is available in multiple versions with several user selectable options, including temperature and RH measurement capability. The CozIR®-A also features a built-in auto-zero function that maintains CO2 measurement accuracy over the lifetime of the product. FEATURES • Low power CO2 sensor • 30ppm typical measurement accuracy • Solid state NDIR LED optical technology • UART control and data interface • Built-in auto-zeroing • Optional Temperature and Relative Humidity sensing • Optional Analogue (Voltage) output APPLICATIONS • Agriculture • Healthcare • Safety • Aerospace • Food packaging • Food storage and transportation Production Data, Revision 4.5, 23 June 2021 Page | 1 For regular updates, go to https://www.gassening.co.uk Copyright © 2021 Gas Sensing Solutions

For regular updates, go to https://www.gassening.co.uk Production Data, Revision 4.5, 23 June 2021 Copyright © 2021 Gas Se

Gas Sensing Solutions Ltd. Page | 3 For regular updates, go to https://www.gassening.co.uk Production Data, Revision 4.5, 23 June 2021 Copyright © 2021 Gas Sensing Solutions Ltd

CozIR®-A Flexible Low Power CO2 Sensor ORDERING INFORMATION COZIR-A-X-XXX-X X 2000 5000 1 X H Blank X V Blank Measurement Range 2,000ppm 5,000ppm 10,000ppm (1%) Temperature and RH Included Not included CO2 Voltage Output Included Not included Temperature Range Uncased Cased Notes: 1. Sensors are shipped individually See separate data sheet for CozIR®-A evaluation kit options Gas Sensing Solutions Ltd. Page | 4 For regular updates, go to https://www.gassening.co.uk Production Data, Revision 4.5, 23 June 2021 Copyright © 2021 Gas Sensing Solutions Ltd

CozIR®-A Flexible Low Power CO2 Sensor PACKAGE DRAWING: CozIR®-A - Cased Production Data, Revision 4.5, 23 June 2021 Page | 5 For regular updates, go to https://www.gassening.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-A Flexible Low Power CO2 Sensor PACKAGE DRAWING: CozIR®-A – Uncased Bottom View Gas Sensing Solutions Ltd. Page | 6 For regular updates, go to https://www.gassening.co.uk Production Data, Revision 4.5, 23 June 2021 Copyright © 2021 Gas Sensing Solutions Lt

CozIR®-A Flexible Low Power CO2 Sensor PIN-OUT DESCRIPTION: CozIR®-A (Both Types) Production Data, Revision 4.5, 23 June 2021 Page | 7 For regular updates, go to https://www.gassening.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-A Flexible Low Power CO2 Sensor ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are stress ratings only. Permanent damage to the CozIR®-A may be caused by continuously operating at or beyond these limits. The CozIR®-A 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. Production Data, Revision...

CozIR®-A Flexible Low Power CO2 Sensor PERFORMANCE CHARACTERISTICS Test Conditions Unless Otherwise Specified VDD = 3.3V, GND = 0V. CO2 = 450ppm, RH = 0% non-condensing, T= 25°C, Pressure = 1013mbar Production Data, Revision 4.5, 23 June 2021 Page | 9 For regular updates, go to https://www.gassening.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-A Flexible Low Power CO2 Sensor HUMIDTY PERFORMANCE CHARACTERISTICS - CozIR®-A Option Notes 1. The output CO2 accuracy is degraded where ANALOGUE_OUTPUT <50mV, or >VDD-50mV 2. ANALOGUE_OUTPUT accuracy specified with a resistive loading @ >100Kohm Production Data, Revision 4.5, 23 June 2021 Page | 10 For regular updates, go to https://www.gassening.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-A Flexible Low Power CO2 Sensor ELECTRICAL CHARACTERISTICS Production Data, Revision 4.5, 23 June 2021 Page | 11 For regular updates, go to https://www.gassening.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-A Flexible Low Power CO2 Sensor PARAMETER Notes 1. The timing for FRESH_AIR_ZERO is identical to NITROGEN_ZERO 2. Ensure gas concentration is stable (t1) before beginning zeroing process Production Data, Revision 4.5, 23 June 2021 Page | 12 For regular updates, go to https://www.gassening.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

CozIR®-A Flexible Low Power CO2 Sensor METHOD OF OPERATION After power is applied to the CozIR®-A, 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 CozIR®-A family has 3 potential modes of operation. MODE 0 COMMAND MODE In this mode, the sensor is in a SLEEP mode,...

CozIR®-A Flexible 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 specific and is...