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NAP-520 Electrochemical Hydrogen Sulphide Gas Sensor

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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.

SKU: NAP-520 Category:
Specification Value
Detectable Gas Hydrogen Sulphide (H₂S)
Detection Range 0 – 100 ppm
Maximum Overload 500 ppm
Output Current 120 ± 20 nA/ppm
Reproducibility (Same Day) ± 2%
Zero in Clean Air < ± 1 ppm equivalent
Long Term Drift (Zero) < ± 1 ppm / year
Long Term Drift (Span) < 10% signal / year
Response Time (T90) < 30 seconds
Temperature Drift (Zero) < 2 ppm (-20°C to +50°C)
Temperature Range -20°C to +50°C
Humidity Range (Constant) 15–90% RH
Humidity Range (Intermittent) 0–99% RH
Pressure 0.9 – 1.1 atm
Recommended Load Resistor 10 Ω
Expected Lifetime > 2 years
Storage Time 6 months

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