NH3 ammonia sensor

electrochemicalfor air quality monitoringppm level

Product Overview
Smart cartridge designed by Kunak that integrates a sensor capable of accurately and reliably measuring Ammonia (NH3) levels.

• GasPlug TECHNOLOGY | PATENTED DESIGN

Where is it found?
Ammonia (NH3) is a colourless gas with a pungent odour that can be detected by humans at 0.4-1 ppm, with an exposure limit of 50 ppm. NH3 originates from both natural and anthropogenic sources, mainly agriculture (fertiliser application and fabrication) and livestock (manure management), followed by waste and water management (slurries, composting, and landfills). Other sources include household and industrial cleaners, which can directly affect humans exposed to them.
Why is it harmful?
NH3 is a volatile gas poisonous if inhaled at high concentrations, causing respiratory tract and eye irritation, and throat and skin irritation in lesser amounts. It is highly soluble in water, associated with acid deposition and eutrophication, affecting land and water ecosystems by reducing biodiversity. It is explosive when mixed with air or oxygen at very high concentrations and contributes to the formation of particulate aerosols in the atmosphere as a secondary particulate precursor.
NH3 Cartridge Types
The NH3 cartridges contain electrochemical sensors that accurately measure NH3 in different ranges. There are 3 types of NH3 cartridges for different applications:

• Type A: Detects low concentrations up to 50 ppm with typical noise less than 0.3 ppm (ambient temperature < 25 ºC). Responsive to H2S at high concentrations (ppm level); to accurately measure NH3, an H2S cartridge should be installed in the same device. Kunak’s algorithm corrects H2S interference for precise NH3 measurements.
• Type B: Higher range version for continuous measurements up to 1,500 ppm, less precise at low concentrations. Type A and B are for industrial leak detection, not for environments with continuous background NH3 (e.g., livestock).

Technical Specifications
Type | Electrochemical
Unit of measurement | mg/m³, ppm
Measurement range | 0 - 50 ppm (A-C), 0 - 1,500 ppm (B)
Resolution | 0.01 ppm
Operating temperature range | -10 to 50ºC (A), -20 to 43ºC (B), -20 to 40ºC (C)
Operating RH range | 0 to 99 %RH
Recommended RH range | 15 to 90 %RH
Operating life | > 24 months
Guarantee range | 100 ppm (A), 5,000 ppm (B), 200 ppm (C)
Limit of Detection (LOD) | 0.02 ppm (A-C), 0.15 ppm (B)
Repeatability | 0.03 ppm (A), 0.5 ppm (B), 0.1 ppm (C)
Response time | < 45 sec (A), < 45 sec (B-C)
Typical accuracy (MAE) | ± 0.3 ppm (A), ± 1.5 ppm (B), ± 0.5 ppm (C)
Typical Intra-model variability | < 0.1 ppm (A-C), < 0.2 ppm (B)

Characteristics / Technical Specifications

• Sensor type: Electrochemical
• Measurement units: mg/m³, ppm
• Measurement range: 0-50 ppm (A, C), 0-1,500 ppm (B)
• Resolution: 0.01 ppm
• Operating temperature: -10 to 50ºC (A), -20 to 43ºC (B), -20 to 40ºC (C)
• Operating RH: 0-99 %RH
• Recommended RH: 15-90 %RH
• Operating life: >24 months
• Guarantee range: 100 ppm (A), 5,000 ppm (B), 200 ppm (C)
• Limit of Detection: 0.02 ppm (A, C), 0.15 ppm (B)
• Repeatability: 0.03 ppm (A), 0.5 ppm (B), 0.1 ppm (C)
• Response time:
• Typical accuracy (MAE): ±0.3 ppm (A), ±1.5 ppm (B), ±0.5 ppm (C)
• Typical intra-model variability: