NH3 sensor-Ammonia electrochemical gas sensor

An ammonia electrochemical gas sensor is a device detect and measure the concentration of ammonia (NH3) in a given environment.
NH3 sensor-Ammonia electrochemical gas sensor

NH3 sensor-Ammonia electrochemical gas sensor

Table of Contents

NH3 sensor Introduction

An ammonia electrochemical gas sensor is a device detect and measure the concentration of ammonia (NH3) in a given environment. Ammonia is a colorless, pungent gas with significant implications for health, safety, and environmental monitoring. Electrochemical sensors are widely used for detecting various gases due to their high sensitivity, selectivity, compact size, low power consumption, and relatively low cost.

The principle of operation of an ammonia electrochemical gas sensor is based on the electrochemical reaction that occurs when ammonia comes into contact with the sensing electrode within the sensor. The sensor typically consists of three main components: a working electrode, a counter electrode, and a reference electrode, all housed within a sealed chamber.

Functioning and Features:

Sensing electrode: The working electrode is coated with a specific material that promotes the electrochemical reaction with ammonia. When ammonia molecules come into contact with the sensing electrode, they undergo an oxidation or reduction reaction, depending on the sensor design.

Electron transfer: During the electrochemical reaction, electrons are transferred between the ammonia molecules and the sensing electrode. This transfer of electrons generates a current proportional to the concentration of ammonia present in the environment.

Measurement circuit: The generated current is then measured by an electronic circuit integrated into the sensor. This circuit amplifies and processes the signal, converting it into a readable output, such as parts per million (ppm) or percent volume (%V).

Selectivity: To ensure high selectivity and minimize interference from other gases, the sensing electrode material is often tailored specifically for ammonia detection. In addition, you can add filter layer in sensor, in order to prevent from the impact of other gases.

Temperature and humidity compensation: Since ambient temperature and humidity can influence the performance of electrochemical sensors, many ammonia sensors incorporate temperature and humidity compensation mechanisms to maintain accuracy under varying environmental conditions.

Output signal: The output signal from the ammonia electrochemical gas sensor can be analog or digital, depending on the sensor design. Analog signals typically provide a continuous voltage or current output proportional to the ammonia concentration, while digital sensors provide discrete concentration levels or threshold alarms.


Industrial hygiene and safety: Monitor ammonia levels in ammonia producing workplaces.

Environmental monitoring: Detecting ammonia emissions from agricultural activities, wastewater treatment plants, and industrial processes to assess air quality and comply with regulatory requirements.

Indoor air quality: Measuring ammonia concentrations in residential, commercial, or public spaces to ensure healthy and comfortable indoor environments.

Food and beverage industry: Monitoring ammonia levels in cold storage facilities, food processing plants, and packaging lines to maintain product quality and safety.

Agriculture and livestock farming: Detecting ammonia in animal housing and manure storage areas to assess ventilation effectiveness, animal welfare, and environmental impacts.

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