Sensing Technology

Electrochemical sensors produce an electrical signal through a chemical reaction with the target gas at a sensing electrode. In most electrochemical cells, the electrical current generated exhibits a linear relationship with the gas concentration being detected. To ensure accurate measurements, the quantitative correlation between the current and gas concentration is maintained constant by a reference electrode, which stabilises the electrolytic process turnover rate at the working electrode (sensing electrode).

Our gas detectors employ highly sensitive electrochemical sensors that can effectively detect a wide range of toxic gases. These gases include chlorine, ammonia, carbon monoxide, hydrogen peroxide, nitrogen oxide, ozone, nitrogen dioxide, sulfur oxide, and oxygen. Our sensors are designed to provide reliable and precise measurements, enabling prompt detection of hazardous gas levels.

Under specific conditions, flammable gases and vapors can undergo oxidation through a heat-releasing reaction with atmospheric oxygen. To facilitate this process, a catalyst material is employed. The catalyst material experiences measurable heating as the reaction occurs, increasing temperature.

This temperature rise impacts the resistance of an element installed in a Wheatstone bridge configuration. By measuring the changes in resistance, the gas concentration can be determined. The resistance variations in the Wheatstone bridge provide valuable data that can be utilised to assess the target gas concentration accurately.

Our MetCam is specifically designed to monitor Methane or Natural gas clouds in large industrial Ex areas. It is a fully integrated camera unit that can autonomously detect methane and natural gas clouds that exceed safety levels, providing timely warnings to prevent accidents. MetCam can also detect small emissions for routine preventive maintenance operations and serves as a situational awareness camera. MetCam is built with high reliability components and has no moving parts, enhancing its operability and eliminating the need for special maintenance or calibrations, except for external cleaning periodically.

Ultrasonic gas leak detection works by utilising specialized sensors that detect high-frequency sound waves emitted by gas leaks. These sensors are designed to detect the distinct ultrasonic frequencies produced by the turbulence and vibrations caused by the escaping gas. When a gas leak occurs, the sensor picks up these ultrasonic signals and converts them into electrical signals. The electrical signals are then analysed by the system to identify and locate the gas leak. Ultrasonic gas leak detection is known for its effectiveness in detecting leaks in various gas systems, including compressed air, steam, natural gas, and other industrial gases. It offers a non-intrusive and reliable method for early detection of gas leaks, enhancing safety and minimising the risk of accidents.

The Photo-Ionization Detector (PID) is a sensor integrated into our portable or fixed detectors, used for the detection of volatile organic compounds (VOCs) such as Benzene, Butadiene, Toluene, and some inorganic compounds. It can detect these compounds within a range from parts-per-billion (ppb) to thousands of parts-per-million (ppm). The key component of a PID is the UV lamp, which emits photons to ionize the gases. When ionizable substances enter the sensor’s measuring chamber, their electrical conductivity increases, resulting in a charge exchange and current flow between the installed electrodes. The current level is directly proportional to the gas concentration and is displayed in parts per million (ppm) on the detector’s screen.

The Dräger Flame 1500 flame detector uses its triple IR sensor to detect hydrocarbon fires. It provides excellent false alarm immunity, as approved by FM while maintaining a response time of under 4 seconds.

The powder-coated housing made of stainless steel or aluminium is very robust and weatherproof. The viewing window is heated to protect against icing and fogging and is therefore used in harsh environments. The three-color LED on the front lets you quickly see the unit’s status.

The Dräger Flame 1750 H₂ is specifically designed for the detection of hydrogen fires. Its three IR sensors measure in the range of 2 to 4 μm relevant for hydrogen flames, guaranteeing high thereby high performance and a low false alarm rate. Common sources of false alarms, such as hot CO₂ or welding work.

The Dräger Flame 1350 combines a UV and an IR sensor to safely and reliably detect hydrocarbon-based fires. Due to its reliability and performance, it meets IEC 61508 safety integrity requirements according to SIL2, as well as the high performance requirements of EN54-10 and FM3260.

The flame detector also features HART^® and RS-485 interfaces and has low power consumption.