Gas Detection Systems
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The Invisible Danger Sensors Safety devices and protective measures against hazardous gases and vapours are becoming more and more important. Increasing appreciation of the problem combined with more accurate knowledge and investigation of the dangers which arise from these substances are the driving forces behind the development of gas measuring and detection systems. For objective assessment of the dangers, two factors are particularly important: A sensor reacts to the presence of a particular gas or types of gas. It is chosen according to the particular application and adjusted appropriately. Sensors with different measurement principles like pellistor gas sensors (catalytic combustion), semiconductor sensors, infrared gas sensors and sensors with electrochemical cells are available. • explosion potential of the gas/vapour-air mixture • danger to health (toxicity) posed by the gases and vapours Gas Warning Systems The task of gas detection systems is the continuous monitoring and timely warning of the presence of potentially-explosive or toxic gases and vapours. Such a system comprises a sensor, a controller with control outputs, and appropriate connected equipment, such as valves, ventilators, and warning lights. Stand-alone measuring sensors are able to trigger connected measures without controllers. ATEX Bieler + Lang GmbH Gas Detection Systems or * integrated outputs for pre- and main alarm POB 1129, D - 77842 Achern Von-Drais-Str. 31, D - 77855 Achern Germany Sensors Overview Bieler + Lang GmbH – Gas Detection Systems – Version 06/2015 – subject to technical modifications The controllers supplies its sensors with their oper-ating voltages and compares the signals it receives from a sensor with the different alarm thresholds. When the concentration rises above the alarm threshold, this is indicated optically by the relevant LED, and the assigned relay contact is switched. Thus optic and acustic alarm equipment, security valves and ventilation

Sensors for Combustible Gases and Vapours ExDetector HC 100 ExDetector HC 100 K + HC 100 T (for duct mounting) Ex-zone 1 • Electrical safety of the HC 100 (Ex-zone 1): II 2G Ex de [ib] IIC T6 PTB 00 ATEX 1075 • Electrical safety of the HC 100 K + T (Ex-zone 1): HC 100 K HC 100 T II 2G II 2G Ex de IIC T6 Ex de [ib] IIC T6 PTB 00 ATEX 1075 PTB 00 ATEX 1075 • • • • • • Safety Integrity Level SIL1 Measurement function: BAM 03 ATEX 0003 X Measuring principle: catalytic combustion Measurement range 0 - 100 % LEL (lower explosion limit) Linear measurement signal 4 - 20 mA One-man calibration –...