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

General Description:

The NE4-NH3 is an electrochemical gas sensor with 3 electrodes for the detection of Ammonia (NH3) in a variety of industrial and commercial gas detection 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.


NE4-NH3 Electrochemical Ammonia Gas Sensor


Detectable gas:

Ammonia (NH3)

Detection range:

0 – 100 ppm

Maximum overload:

200 ppm

Output current:

40 +/- 12 nA/ppm


+/- 10%

Zero offset in clean air:

<+/- 10ppm Equivalent

Output drift in air:

less than %/month

Response time (90%):

< 90 seconds

Temp. depend. in air:

<15ppm (-30 to+50°C)

Expected lifetime:


Operating conditions

Operating temperature:

 -30 +50 degrees C

Humidity range:

15 – 90% RH


0.9 – 1.1 atm

Recommended resistor:

10 ohms

Bias voltage:

Not required