Low-Cost Electrochemical Toxic Gas Sensors for Residential and Light Commercial Applications

NE4-H2S-500 Electrochemical Hydrogen Sulphide Gas Sensor

General Description:

The NE4-H2S-500 is an electrochemical gas sensor with 3 electrodes for the detection of Hydrogen Sulphide (H2S) in a variety of industrial process control applications. Exhibiting high performance with long-term stability, this compact (20.4mm dia) sensor is suitable for portable gas detection Instruments or fixed gas detection heads.  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.

Similar to the popular NE4-H2S-100 sensor, the NE4-H2S-500 has an extended detection range or 500ppm, enabling it to be used in process control applications such as Biogas plants or analysis of landfill gas



Detectable gas:

Hydrogen Sulphide (H2S)

Detection range:

0 – 500 ppm

Maximum overload:

2,000 ppm

Output current:

200 +/- 50 nA/ppm


+/- 2%

Zero offset in clean air:

<+/- 2ppm Equivalent

Output drift in air:

less than 10%/year

Response time (90%):

< 30 seconds

Temp. depend. in air:

<3 ppm (-20 to+50°C)

Expected lifetime:


Operating conditions

Operating temperature:

 -20 +50 degrees C

Humidity range:

15 – 90% RH


0.9 – 1.1 atm

Recommended resistor:

10 ohms

Bias voltage:

Not required