SenSmart 7000 Series Wireless Gas Detector - GAS SENSOR TECHNOLOGIES USED
by RC Systems
The SenSmart 7000 Series Wireless Gas Detector uses the latest generation smart sensor technologies that RC Systems manufactures.
- Due to its inherent low power requirement, it only accepts Electrochemical, and Low-Power Infrared sensors.
- RC Systems offers many sensors to choose from. For a complete list of gases, please visit the "Detectable-Gases" tab.
Electrochemical Gas Sensor (EC)
Electrochemical sensing devices basically consist of electrodes surrounded by an electrolyte solution enclosed behind a gas permeable, hydrophobic membrane. Gas molecules diffuse across the membrane to enter the electrode/electrolyte interface where chemical and electrochemical reactions occur to generate measurable electrical current flow. Current flow is directly related to gas concentration over the specified detection range. In the absence of target gas, negligible electrical current flows and, consequently, a definite zero is achieved and maintained (no zero drift). A combination of electrodes and electrolyte chemistry largely determines the type of gas detected and provides inherent chemical selectivity.
Infrared Gas Sensor (IR)
Infrared detectors are based on the principle of infrared absorption by gas molecules at specific wavelengths in the infrared region. The sensor utilizes an infrared lamp source and dual detectors, active and reference. The active detector is covered by an optical filter that allows transmission of infrared radiation at a specified wavelength where the target gas is known to absorb. The reference element is covered by a filter that transmits wavelengths outside the absorption band. This arrangement provides compensation for normal changes in lamp intensity over time. The infrared detector can be supplied for hydrocarbon (LEL), carbon dioxide or refrigerant (R134a, R125) measurement. Unlike catalytic sensors for hydrocarbon detection, the infrared sensor is unaffected by catalytic inhibitors and poisons.