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Low-cost compact Hydrogen Sulphide (H2S) Sensor

NAP-520 hydrogen sulfide gas sensor


Detectable Gas:

Detection range:

Maximum overload:

Output current:


Long Term Sensitivity drift:

Response time (90%):

Temp. depend. in air:

Expected lifetime:

Hydrogen Sulphide (H2S)

0 – 100 ppm

500 ppm

120 +/- 20 nA/ppm

+/- 2%

less than 10% /year

< 30 seconds

< 2 ppm (-20 to 50°C)

>2 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

General Description:

The NAP-520 is an Electrochemical gas sensor with 3 electrodes for the detection of Hydrogen Sulphide (H2S) in a variety of gas detection applications.

Exhibiting high performance with long term stability, the small size of the NAP-520 makes it particularly suitable for portable instruments such as disposable “badge” type gas detectors.

Nemoto's porous electrode technology enables accurate gas detection with high sensitivity. The mechanical design of the sensor gives optimum gas diffusion characteristics, and the hermetically sealed enclosure prevents costly electrolyte leakage.

  •        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

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