General Monitors” S4000C and S4100C combustible gas detectors are now suitable for use in Safety Integrity Level (SIL) 3 applications commonly found in industries where the potential presence of dangerous hydrocarbon-based combustible gas is a threat to people, equipment, and facilities. The S4000C Detector is a hydrocarbon gas detector that is suitable for SIL Level 3 applications and is FM, CSA, ATEX, CE Marking, and GOST-approved. It features a three-digit display and an explosion-proof housing, which allows all data to be processed locally at the sensor site. The S4000C is also available with an optional relay configuration that is appropriate for SIL Level 2 processes. With its catalytic bead sensor, the S4000C Detector monitors combustible gas and vapors within the lower explosive limit (LEL) and provides status indication and alarm outputs. When the sensor detects gas, it initiates a four to 20 mA alarm signal that is proportionate to the zero to 100 percent LEL gas concentration present and communicates the alarm notification to the safety system. Designed for the European community, the S4100C Detector is a hydrocarbon gas detector that is suitable for SIL Level 3 applications and is ATEX, CE Marking, GOST, and Kazakhstan-approved. It features a three digit-display and an explosion-proof housing, which allows all data to be processed locally at the sensor site. The S4100C also features a catalytic bead sensor. It is designed to measure and display concentrations of combustible gases in the zero to 100 percent LEL range, but will continue to display concentrations up to 120 percent LEL. The sensing element may be incorporated in the transmitter housing or remotely mounted at distances of 600 meters. As part of its SIL offering, General Monitors has developed a Safety Integrity Level (SIL) Online Resource Center. The site is located at: www.gmigasandflame.com/sil_lead.html.