By American Institute of Chemical Engineers. Center for Chemical Process Safety.; American Industrial Hygiene Association
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Operates in a wide temperature range. Can be poisoned by Combustible trace amounts of hydrocarbon gases. substances containing silicon, sulfur compounds, chlorine and some heavy metals. , used in fire extinguishers). High or continuous concentrations can bum out or permanently damage (crack) sensor which may not be detected until the next calibration. Following recommendedcalibration frequencies is extremely important. 1: Sensor Selection Matrix (continued). Sensor/Detector Advantages Disadvantages Typical Analyte(s) Photoionization Fast response for many volatile organic compounds.
6 EXAMPLE APPLICATIONS OF THE CONTINUOUS MONITORING SYSTEM The application of continuous monitoring systems is perhaps best examined by industrial examples. This discussion begins with theoretical exposure scenarios, followed by specific applications. 1 Generalized Applications In any manufacturing industry, a raw material has to go through four key stages before reaching its final product state. These stages are: 1. Raw material receiving/sorting/ storing 2. Raw material processing 20 3. Reactiodproduct generation 4.
Continuous monitoring of pressure and temperature in reaction vessels along with built-in safety measures and external shutdown mechanism will reduce the probability of such incidents. In the Semiconductor industries this also includes MOCVD reactors, Ion Implanters, Diffusion furnaces, and plasma etch processes. 4. , sugar, pharmaceuticals)are further processed to either convert the state of the product to pellets, powder, etc. This involves drying operations that typically generate a lot of dust.