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Carbon Monoxide Sensor

Carbon Monoxide Sensor

Product catalog summary

Performance Specifications
The sensor operates effectively within a carbon monoxide (CO) concentration range of 5 to 500 ppm. The sensor resistance (Ro) is specified at 220 ±50 kΩ at 50% relative humidity and 23°C. The sensor resistance ratio (Rg/Ro) for CO at 20 ppm in air is 120 ±15%. The gas response relationship is defined as Rg/Ro - 1 = k.Conc for 5 - 50 ppm with a value of 0.01 ±10%, and Rg/Ro - 1 = k.Conc^0.5 for 50 - 500 ppm with a value of 0.08 ±15%. Heater resistance varies with temperature: 10 ±1.5 Ω at room temperature (23°C), 22 ±3 Ω at sensing temperature (400°C), and 26 ±3 Ω at reset temperature (525°C). Heater power consumption is 340 ±30 mW at 2.7 ±0.2V (400°C) and 530 ±50 mW at 3.7 ±0.3V (525°C). The operating temperature range is -20 to 120°C.

Cross Sensitivity
Cross sensitivity data for H2, EtOH, C3H8, and NH3 is to be announced (TBA).

Sensor Characteristics
This p-type metal oxide gas sensor is designed for ambient and extreme conditions, outperforming electrochemical sensors. It features a CO-selective filter and exhibits a large dynamic range, repeatable response, and low humidity response. The sensor's resistance increases in the presence of CO, and the change in resistance can be converted to an output voltage using a simple electrical circuit. Optimal performance is achieved by cycling the sensor between 400°C (sensing) and 525°C (resetting).

Graphical Data
Figures illustrate the sensor's response at low concentrations (8-50 ppm CO) and high concentrations (10-500 ppm CO), showing linear behavior below 50 ppm and power law behavior above 50 ppm. Another figure demonstrates the response over a range of 10% - 90% relative humidity, operating in a 2-temperature mode with a 5:1 cycle ratio.

Disclaimer
Alphasense Ltd reserves the right to change design features and specifications without prior notification. The data is for guidance only, and Alphasense Ltd accepts no liability for any consequential losses, injury, or damage resulting from the use of this document.

Catalog excerpts

Carbon Monoxide Sensor p-type Metal Oxide Unlike common n-type sensors, this p-type sensor has a large dynamic range, repeatable response, low humidity response and resistance increases in the presence of CO. The change in resistance can be converted to an output voltage via a simple electrical circuit. Although the sensor can be used in constant temperature/ voltage mode, best response is achieved when the sensor is cycled between 400°C (sensing temperature) and 525°C (reset temperature). See our Application Note. PERFORMANCE Range Sensor resistance (Ro) Sensor resistance ratio (Rg/Ro x 100%) ppm CO limit of performance warranty kΩ (50%rh, 23 (± 2)0C) % CO @ 20ppm in air Gas response relationship (Rg/Ro - 1 = k.Conc) 5 - 50ppm Gas response relationship (Rg/Ro - 1 = k.Conc0.5) 50 - 500ppm Heater resistance (RH @ RT) Heater resistance (RH @ sensing temp.) Heater resistance (RH @ reset temp.) Heater power consumption (mW) typical for 5:1 Operating Temperature Range CROSS SENSITIVITY H2 sensitivity EtOH sensitivity C3H8 sensitivity NH3 sensitivity % measured gas @ 100 ppm H2 % measured gas @ 50 ppm EtOH % measured gas @ 500 ppm C3H8 % measured gas @ 25 ppm NH3 Figure 1 Response at low concentrations 1.6 Response from 8-50ppm CO, operating in 2temperature mode with a 5:1 cycle ratio of sensing (400 o C) and resetting (525oC). Response (Rg/Ro) Technical Specification This sensor works well in ambient conditions and also in extreme temperatures and humidities where electrochemical sensors cannot survive. This metal oxide gas sensor is equipped with a filter that allows CO selectivity. CO concentration (ppm) Alphasense Ltd, Sensor Technology House, 300 Avenue West, Skyline 120, Great Notley. CM77 7AA. UK Telephone: +44 (0) 1376 556 700 Fax: +44 (0) 1376 335 899 E-mail: [email protected] Websi

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Carbon Monoxide Sensor p-type Metal Oxide Performance Data Figure 2 Real-time response at high CO concentrations 4 Real-time response data over range 100 - 500ppm CO in 50% rh air. Sensor operating in 2-temperature mode, pulsing between 5 mins at 400oC for 5 mins and 525oC for 1 min. Response (Rg/Ro) Time (minutes) Figure 3 Response from 10 to 500ppm CO 3.50 Response from range 8 500ppm CO operating in 2-temperature mode with a 5:1 cycle ratio of sensing (400 o C) and resetting (525 o C). Note linear behaviour <50ppm and power law behaviour >50ppm. Response (Rg/Ro) Figure 4 Response from 10%...

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Carbon Monoxide Sensor

Carbon Monoxide Sensor

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