Gastec SD-21 Sulphur Dioxide Sensor

Description

The SD-21 operates on the electrochemical oxidation principle. When $SO_2$ gas enters the sensor, it undergoes a chemical reaction at the sensing electrode, generating an electrical current directly proportional to the gas concentration. This signal is then processed by the transmitter to provide a real-time reading on the display or control system.

The sensor is built into a rugged, compact housing designed for long-term stability and a typical service life of 2 years under normal operating conditions.

Brand

Gastec

Although, technology is always evolving, one demand on our products never changes: the demand for customer safety. Whenever we contribute to customer safety, we are presented with an opportunity to develop further.

GASTEC holds this corporate creed of safety and development in high esteem, as it strives to grow while always putting customer safety first.

Features

High Selectivity: Specifically tuned to detect $SO_2$ with minimal cross-sensitivity to gases like $CO$ or $H_2S$ .
Linear Response: Provides a consistent and predictable output across its entire measurement range, ensuring accurate readings at both low and high concentrations.
Fast Response Time: Features a $T_{90}$ response time (typically under 30 seconds), allowing for rapid alerts during a gas leak.
Stable Baseline: Engineered to maintain a steady zero-point, reducing the frequency of required calibrations.
Rugged Design: Built to withstand industrial conditions, including fluctuations in temperature and humidity.

Specifications

Feature	Specification
Model Number	SD-21
Detection Principle	Electrochemical
Target Gas	Sulphur Dioxide ( $SO_2$ )
Standard Range	0 – 20 ppm
Max Concentration	100 ppm (Short-term exposure)
Response Time ( $T_{90}$ )	< 30 seconds
Operating Temp	-20°C to 50°C

Applications

Stack Monitoring: Measuring emissions in power plants and industrial boilers to ensure environmental compliance.
Refineries & Smelters: Protecting workers from $SO_2$ byproducts generated during oil processing or metal ore roasting.
Pulp & Paper Mills: Monitoring bleaching processes where Sulphur Dioxide is frequently utilized.
Food Processing: Tracking concentrations in facilities that use $SO_2$ as a preservative or disinfectant.