Solid State MOS Gas Sensor Technology
"Detect the Difference" with Detcon Gas Detection Sensors, Control Systems & Process Analyzers
Solid State MOS Technology • Extremely Rugged • Very Long Service Life • Inexpensive to Maintain • Not Affected by Prolonged or High Level Exposure to H2S • Longest Warranty of any H2S Gas Detection Sensor in the World Detcon Solid State H2S gas sensor assemblies are designed to monitor ambient air for gas concentrations of hydrogen sulfide in a wide variety of ranges; from the standard field adjustable models with 0-20/50/100 PPM selectivity, to high-range models up to 1,000 PPM. The sensor technology is a proprietary solid state metal oxide semiconductor. The sensor consists of two thin films: a temperature sensitive heater film, and a hydrogen sulfide sensitive sensor film. Both films are deposited on a silicon microchip by vacuum deposition. The heater film elevates the operating temperature of the sensor film to a level where an optimized sensitivity and response to hydrogen sulfide is achieved. The sensor film consists of a proprietary metal oxide that shows a dynamic signal change to hydrogen sulfide gas. Range of sensitivity is from PPB to % by volume. This rugged sensor is capable of maintaining its operating characteristics for periods of up to 10 years in most industrial environments. The technology is offered in three explosion-proof instrument packages with varying features as described in the PDF Documentation. H2S Sensor Brochures in .PDF Format H2S Sensors 6-panel full color brochure (TP-424, TP-524, TP-624) Model Series 700 6-panel full color brochure. TP-424C Detcon Model TP-424C Hydrogen Sulfide sensors are designed to detect and monitor H2S in air over the range of 0-100 ppm. • Standard 4-20 mA PDF Documents TP-424C Data Sheet TP-424C Eng. Specs CSA Certification UL US Certification UL Canada Certification TP-524C Detcon Model TP-524C Hydrogen Sulfide sensors are non-intrusive “Smart” sensors designed to detect and monitor H2S in air over the range of 0-100 ppm. • Microsafe Sensor • 4-20 mA Output • Non-Intrusive Interface PDF Documents TP-524C Data Sheet TP-524C Eng. Specs CSA Certification UL US Certification UL Canada Certification TP-624C Detcon Model TP-624C Hydrogen Sulfide sensors are non-intrusive “Smart” sensors designed to detect and monitor H2S in air over the range of 0-100 ppm. • Microsafe Sensor • 4-20 mA, RS-485, Relays • Non-Intrusive Interface PDF Documents TP-624C Data Sheet TP-624C Eng. Specs CSA Certification UL US Certification UL Canada Certification TP-700 Detcon Model TP-700 Hydrogen Sulfide sensors are non-intrusive “Smart” sensors designed to detect and monitor H2S in air over the range of 0-100 ppm. • Microsafe Sensor • 4-20 mA, RS-485, Relays • Non-Intrusive Interface • Environmentally Bulletproof • Electropolished 316SS • 100% Encapsulated Circutry • Water-Corrosion Proof • Multi-Layer Surge Protection • Preemptive Fault Diagonostics • SIL 2 Compliant PDF Documents TP-700 Data Sheet TP-700 Eng. Specs - Tab TP-700 Eng. Specs - Text CSA Certification ATEX 700-TP Principle of Operation Method of detection is by diffusion/adsorption. Air and gas diffuse through a sintered stainless steel filter and contact the heated surface of the metal oxide sensor film. As hydrogen sulfide gas molecules react with oxygen ions on the film, there is a decrease in electrical resistance proportional to the gas concentration. The heater film elevates the temperature of the sensor film creating convection and promoting a quick response to changing gas concentrations. This heater film is electronically controlled to maintain a constant temperature at the sensor film, thus enhancing stability and repeatability and eliminating the need for temperature compensation of the output. The sensor response is reversible and results in continuous monitoring of ambient air conditions.
Detcon Inc. 3200 Research Forest Drive, A-1 • The Woodlands, Texas 77381, USA Phone 713-559-9200 • Toll Free 888-367-4286 • Fax 281-292-2860 • Email: sales@detcon.com