Residential Carbon Monoxide (CO) Sensor

General Description:

The NAP-505 Gas Sensor is a low–cost 3-electrode electrochemical gas sensor designed for the detection and measurement of carbon monoxide in the range 0-1000ppm, in domestic carbon monoxide detectors, fire detectors, air quality monitors and commercial gas detection applications such as Underground Car Parks.

Warranted for 7 years continuous operation, and conforming with all relevant performance standards, including component listing to UL 2075, the NAP-505 represents outstanding performance/price benefits over other designs.

The NAP-505 may be soldered directly to a pcb, and each sensor is also labelled with a QR code giving its calibration data, meaning the finished instrument may be calibrated electronically without the need to expose the detector to test gas - an important production cost saving for high volume CO detector manufacturers.



Detectable Gas:

Detection range:

Maximum overload:

Output current:


Output drift in air:

Response time (90%):

Temp. depend. in air:

Expected lifetime:

Carbon Monoxide (CO)

0 – 1000 ppm

1500 ppm

40 +/- 15 nA/ppm

+/- 2%

less than 5 ppm

< 30 seconds

<10ppm (0-40°C)

7 years

Operating Conditions:

Operating temperature:

Humidity range:


Recommended resistor:

Bias voltage:

-20 +50 degrees C

15 – 90% RH

0.9 – 1.1 atm

10 ohms

Not required


  •        3-Electrode design for greater stability
  •        Compact, leak-proof enclosure
  •        Resistant to shocks and vibration
  •        Terminals may be soldered
  •        Linear output
  •        Highly specific to target gas
  •        Unaffected by humidity
  •        Low Power consumption
  •        Very Low Long term drift