P-type Metal Oxide Carbon Monoxide (CO) Sensor - CO-MFF, CO-PFF, CO-AFF

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• CO-xFF: equipped with a PTFE-based dust/water filter and an Activated Carbon filter
• Range: 5 to 500 ppm CO limit of performance warranty
• Operating Temperature Range: -20 to 120 °C
• stable baseline
• low humidity sensitivity
• positive response to gases (safer response)

Model Number: CO-MFF, CO-PFF, CO-AFF
Data Sheet:

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Product Specification

P-type Metal Oxide Carbon Monoxide (CO) Sensor Description
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.

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).

Developed over many years, our p-type metal oxide gas sensors offer the following benefits:
• stable baseline
• low humidity sensitivity
• positive response to gases (safer response)

CO detection for extreme temperature or humidity enviroments

Each sensor type can be supplied in three housings:
• TO-5 metal can, the most common format
• Plastic 6-pin housing - frequently used with other metal oxide gas sensors
• Ex housing - stainless steel 316 housing with UL, CSA, ATEX and IECEx approvals, unique for metal oxides, allowing use in hazardous areas without the need for an IS circuit

P-type Metal Oxide Carbon Monoxide (CO) Sensor Housing options

Housing	CO
TO-5 metal	CO-MFF
6-pin Plastic	CO-PFF
Ex certified metal	CO-AFF

CO-xFF: equipped with a PTFE-based dust/water filter and an Activated Carbon filter

P-type Metal Oxide Carbon Monoxide (CO) Sensor PERFORMANCE
Range	ppm CO limit of performance warranty	5 to 500
Sensor resistance (R_o)	kΩ (50%rh, 23 (± 2)°C)	220 ±50
Sensor resistance ratio (R_g/R_o x 100%)	% CO @ 20ppm in air	120 ±15

Gas response relationship (R_g/R_o - 1 = k.Conc)	5 - 50ppm	0.01 ±10%
Gas response relationship (R_g/R_o - 1 = k.Conc^0.5)	50 - 500ppm	0.08 ±15%

Heater resistance (R_H @ RT)	Ω (23 ±1°C	10 ±1.5
Heater resistance (R_H @ sensing temp.)	Ω (400 ±10°C)	22 ±3
Heater resistance (R_H @ reset temp.)	Ω (525 ±10°C)	26 ±3
Heater power consumption (mW) typical for 5:1	V_H= 2.7 ±0.2V (400°C)	340 ±30
Heater power consumption (mW) typical for 5:1	3.7 ±0.3V (525°C)	530 ±50
Operating Temperature Range	°C	-20 to 120

P-type Metal Oxide Carbon Monoxide (CO) Sensor CROSS SENSITIVITY
H2 sensitivity	% measured gas @ 100 ppm H2	TBA
EtOH sensitivity	% measured gas @ 50 ppm EtOH	TBA
C3H8 sensitivity	% measured gas @ 500 ppm C3H8	TBA
NH3 sensitivity	% measured gas @ 25 ppm NH3	TBA