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CozIR-LP Data Sheet

Product catalog summary

Introduction
The CozIR®-LP is a low power NDIR CO2 sensor designed for battery-powered applications, utilizing advanced solid-state LED optical technology. It is suitable for various uses, including wireless equipment, and features a built-in auto-zero function to maintain measurement accuracy.

Key Features

Low power consumption
30ppm typical measurement accuracy
Solid state NDIR LED optical technology
UART control and data interface
Built-in auto-zeroing

Applications

Indoor Air Quality (IAQ)
IoT and Smart Technology wireless equipment
Air Quality and HVAC Systems
Building Management Systems (BMS)
Demand-Controlled Ventilation (DCV) systems
Transport and In-Cabin Air Quality

Ordering Information
The sensor is available in measurement ranges of 2,000ppm, 5,000ppm, and 10,000ppm, shipped individually or in trays of 50.

Technical Specifications

Supply Voltages: -0.3V to +6.0V
Operating Temperature: 0°C to +50°C
Storage Temperature: -40°C to +70°C
Humidity Range: 0 to 95% RH, non-condensing
Operating Ambient Pressure: 500mbar to 2bar

Recommended Operating Conditions

Supply Voltage (VDD): 3.25V to 5.5V

Performance Characteristics

CO2 Measurement Range: 0 to 10,000 ppm
Accuracy: ±(30, +3%) of reading at 25°C
Response Time: 30 seconds
Current Consumption: 15mA peak when sampling

Power Consumption
The sensor's power consumption is approximately 25mJ per reading, adjustable based on digital filter settings and measurement period.

Operation Modes

Mode 0 (Command Mode): Sleep mode, awaiting commands.
Mode 1 (Streaming Mode): Default mode, reporting measurements twice per second.
Mode 2 (Polling Mode): Measurements taken in the background, reported upon request.

Digital Filter and Zero Point Setting
The sensor uses a digital filter to process signals, with adjustable settings for accuracy and response time. Zero point can be set using known gas concentration, nitrogen, or fresh air, with an auto-zero function available.

Altitude Compensation
The sensor adjusts for pressure changes due to altitude, with a compensation table provided.

Control Interface
Controlled via a UART interface, the sensor outputs CO2 measurements in ASCII format.

Measurement Data Outputs
Outputs both filtered and unfiltered CO2 data, configurable through commands.

UART Interface Commands

A Command: Sets or returns the digital filter value.
F, G, U, u, X Commands: Zero-point settings with different gases or manual input.
P Command: Sets CO2 background concentration for auto-zeroing.
S Command: Sets or returns altitude compensation value.
@ Command: Configures auto-zero intervals.
Y Command: Returns firmware version and sensor serial number.

Legal and Usage Notices
Includes a disclaimer about the use of GSS products, emphasizing they are not intended for life support systems or applications where failure could result in significant harm.

Contact Information
Provides the address for Gas Sensing Solutions Ltd. in the United Kingdom for further inquiries or support.

Catalog excerpts

CozIR®-LP Low Power CO2 Sensor DESCRIPTION The CozIR®-LP 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®-LP'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 CozIR®-LP operation is configurable depending on user requirements. On power-up, the CozIR®-LP automatically starts taking measurements. Measurements can be streamed or output on request. The CozIR®-LP also features a built-in auto-zero function that maintains CO2 measurement accuracy over the lifetime of the product. BLOCK DIAGRAM FEATURES • Low power CO2 sensor • 30ppm typical measurement accuracy • Solid state NDIR LED optical technology • UART control and data interface • Built-in auto-zeroing APPLICATIONS • Indoor Air Quality (IAQ) • IoT and Smart Technology wireless equipment • Air Quality and HVAC Systems • Building Management Systems (BMS) • Demand-Controlled Ventilation (DCV) systems • Transport • In-Cabin Air Quality Production Data, Revision 4.5, 23 June 2020 Page | 1 For regular updates, go to https://www.gassensing.co.uk Copyright © 2020 Gas Sensing Solutions

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CozIR®-LP Low Power CO2 Sensor ORDERING INFORMATION CozIR®-LP-X See separate data sheet for CozIR®-LP evaluation kit options. Notes: 1. Sensors are shipped individually or in trays 2. Tray quantity = 50 Production Data, Revision 4.5, 23 June 2020 Page | 4 For regular updates, go to https://www.gassensing.co.uk Copyright © 2020 Gas Sensing Solutions Ltd.

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CozIR®-LP Low Power CO2 Sensor PACKAGE DRAWING Bottom View Gas Sensing Solutions Ltd. Page | 5 For regular updates, go to https://www.gassensing.co.uk Production Data, Revision 4.5, 23 June 2020 Copyright © 2020 Gas Sensing Solutions Ltd.

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CozIR®-LP Low Power CO2 Sensor PIN-OUT DESCRIPTION Production Data, Revision 4.5, 23 June 2020 Page | 6 For regular updates, go to https://www.gassensing.co.uk Copyright © 2020 Gas Sensing Solutions Ltd.

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CozIR®-LP Low Power CO2 Sensor ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are stress ratings only. Permanent damage to the CozIR®-LP may be caused by continuously operating at or beyond these limits. The CozIR®-LP 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 4.5, 23 June...

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CozIR®-LP 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 2020 Page | 8 For regular updates, go to https://www.gassensing.co.uk Copyright © 2020 Gas Sensing Solutions Ltd.

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CozIR®-LP Low Power CO2 Sensor POWER CONSUMPTION Test Conditions Unless Otherwise Specified VDD = 3.3V, GND = 0V. CO2 = 450ppm, RH = 0% non-condensing, T= 25°C, Pressure = 1013mbar SYMBOL TEST CONDITIONS OFF Active, SLEEP mode, no measurement Active, taking measurements Default settings The energy per reading is approximately 25mJ using default settings. Power consumption is strongly dependent on digital filter settings (# of pulses) and the measurement period. ݑװݑװݑװݑװݑװݑװݑװݑװݑװݑ (ׂհݑްݑ) = ްݟϰݟ. ϰݟӰݟӰݟӰݟӰݟӰݟӰݟӰݟ Ӣȗ ݒϰݒϰݒϰݒϰݒϰݒϰݒϰݒϰݒϰݒϰݒϰݒ ϰݒаݒаݒаݒ аݒѰݒѰݒѰݒѰݒѰݒ ѰݒѰݒ ѰݒѰݒѰݒѰݒ ѰݒѰݒѰݒѰݒѰݒѰݒ ѰݒӰݒӰݒӰݒӰݒӰݒӰݒӰݒӰݒӰݒ...

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CozIR®-LP Low Power CO2 Sensor METHOD OF OPERATION The CozIR®-LP is designed for low power applications where power is often at a premium. After power is applied to the CozIR®-LP, 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 9600 baud rate. The sensor will return the previous CO2 measurement results if the user requests more frequent measurements. The CozIR®-LP has 3 potential modes of operation....

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CozIR®-LP 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 normally...

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CozIR®-LP Low Power CO2 Sensor ZERO POINT SETTING In all cases, the best zero is obtained when the gas concentration is stable, and the sensor is at a stabilised temperature. 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 zero point regardless of what method is used. There are a several different methods available to the user to set the zero point of the sensor. ZERO IN A KNOWN GAS CONCENTRATION Place the sensor in a...

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