The electrochemical portable ammonia gas detector is a device used to measure the concentration of ammonia (NH₃) in the environment, which operates based on the principle of electrochemical sensors. It converts ammonia concentration into measurable electrical signals through electrochemical reactions and is widely used in industrial safety, environmental monitoring, agriculture and other fields.
1.Core principle
(1).Sensor structure:
Sensors are typically composed of a working electrode, a counter electrode and a reference electrode, and are immersed in an electrolyte.
The surface of the working electrode is coated with catalytic materials (such as platinum, gold, etc.) to promote the oxidation or reduction reaction of ammonia.
(2). Chemical Reaction:
Ammonia gas diffuses into the sensor and undergoes a reaction
The changes in ions or electrons produced by the reaction lead to the output of current or voltage signals, and the signal intensity is directly proportional to the ammonia concentration.
(3). Signal Processing:
The internal circuit of the instrument amplifies the weak electrical signal and converts it into an ammonia concentration value (the unit is usually ppm or mg/m³) through an algorithm.
2.Main features
(1).High sensitivity: It can detect ammonia gas concentrations as low as 0.1 ppm.
(2). Quick response: Usually provides readings within a few seconds to a few minutes.
(3).Selectivity: The sensor design can reduce the interference of other gases (such as CO, H₂S).
(4).Portability: Commonly found in handheld or portable devices, suitable for on-site detection.
(5).Long-term stability: Regular calibration is required to maintain accuracy (general lifespan 1-3 years).
3.Typical application scenarios
(1). Industrial safety
Leakage monitoring in chemical plants, refrigeration workshops, fertilizer production and other places.
(2). Agriculture
Monitoring of livestock and poultry farms (ammonia gas produced by manure decomposition) and greenhouse gas emissions.
(3). Environmental monitoring
Air pollution investigation and odor control in sewage treatment plants.
(4). Laboratory
Ammonia concentration analysis in scientific research or industrial processes.